p1684 chrysler voyager

What Does The P1684 Code Mean?

• Updated: March 14, 2023

Some trouble codes are considered generic and the meaning is the same for most types of vehicles. Other codes can be specific to the manufacturer, such as the P1684 code. If you have a Dodge, Jeep, Chrysler, Plymouth, Fiat or RAM, you want to know what this code means. 

In this guide, we look closer at the meaning of the P1684 trouble code and determine what fixes work out the best. We also touch on the symptoms, approximate repair cost and talk about how to diagnose the problem. 

Code P1684 Definition

P1684 – Battery Power To Module Disconnected

What Does the P1684 Code Mean?

The P1684 DTC indicates that the car battery was disconnected within the last 50 starts. The Powertrain Control Module ( PCM ) is responsible for monitoring the charging system and it sets this code when the battery was disconnected or there was a lack of voltage within the past 50 starts.

This code only applies to the Stellanis family of vehicles , such as Dodge, RAM, Chrysler, Jeep, Fiat and Plymouth models. While the code initially indicates that the battery was disconnected, there are other reasons for the code to be set. If you haven’t had the battery disconnected, you will need to perform some troubleshooting steps that we list in a few minutes. 

There are other manufacturers that use the same code, but the meaning is different. If you drive a vehicle that’s not part of the Dodge family, you want to research what those codes mean. We have a small list for you later in the article. 

What Are The Symptoms Of P1684?

If the battery was disconnected temporarily, you may only notice the Check Engine Light. If there are other symptoms present, there could be a larger issue occurring.

Here are some of the most common symptoms with the P1684 trouble code:

• Check Engine Light
• Computer memory loss
• Erratic transmission shifting
• Malfunctioning system sensors
• Power system trouble
• Electrical system glitches

What Are The Causes of P1684?

In many cases, the P1684 code appears because you disconnected the car battery at some point. Here are a few possible causes that you should consider.

• Battery disconnected (while the engine was running or the ignition turned on)
• Swapping the battery with no memory keeper installed
• Defective charging system ( bad battery or alternator )
• Battery corrosion
• Loose cable 
• Defective PCM

How Serious is the P1684 Code?

Low – If you’ve just disconnected the battery, there’s probably nothing wrong. The code came on as a warning to let you know that the battery was disconnected. On the other hand, there could be something wrong if you haven’t disconnected the battery.

Depending on what could be wrong, you may need to take this condition more seriously. A bad battery or alternator could leave you stranded without any notice. 

How Do I Fix the P1684 Code?

If the code occurred because you disconnected the battery, it should reset automatically after 50 start-ups, but you probably don’t want to wait that long. In that case, you can simply reset the code with your compatible OBDII scanner. Otherwise, these fixes might be applicable.

• Clean battery terminals
• Tighten battery connections
• Repair damaged wiring
• Replace battery
• Replace alternator
• Update/replace PCM

Common P1684 Diagnosis Mistakes

Even as a professional mechanic, it can be tough to remember that not all trouble codes are universal. If you aren’t working with a vehicle from the Dodge/Chrysler family, this code may mean something completely different. For that reason, it’s important to research the trouble codes carefully. 

As an example, here is what the P1684 code means with some of the top automakers. 

• Acura: Throttle Valve Return Spring Performance Problem
• Buick: Transmission Control Module Power Up Temperature Sensor Performance
• Cadillac: Transmission Control Module Power Up Temperature Sensor Performance
• Chevrolet: Transmission Control Module Power Up Temperature Sensor Performance
• Gm: Transmission Control Module Power Up Temperature Sensor Performance
• Honda: Throttle valve – return spring performance problem
• Mazda: Metering Oil Pump Position Sensor Circuit Malfunction

If you attempt to apply the same diagnostic steps and repairs to these vehicles, you will not resolve the issue. 

How to Diagnose the P1684 Trouble Code?

With some basic mechanical knowledge, you may be able to figure out what’s going on to cause the P1684 trouble code. Here are some suggestions and steps we would take as professionals.

• Read the trouble codes and research any others you find. If you notice another code that could be contributing to this problem, fix that one first. 
• If you recently replaced the battery, the PCM needs to be reset. Use your compatible code scanner to reset the codes and see if they come back. You could also wait until after 50 restarts for the car to reset on its own, but nobody really enjoys that route.
• If the code continues, you need to visually inspect the wiring. Fix any damaged wires, tighten the connections and clean off battery corrosion .
• Check the battery’s health and charge the battery fully. If the health is bad, replace the battery.
• If you haven’t figured out the problem, it’s time to get out the service manual. You want to follow the manufacturer-recommended methods for checking the battery, alternator and other charging system components. Many auto parts stores will also check the battery or alternator at no charge. Check online to see what’s available near you. 

Unless you are accustomed to working with the charging system, it may be better to leave this job to a professional. It’s not worth getting hurt over or frying the electronics because you are unsure of the proper protocols. 

How Much Does It Cost To Fix Code P1684?

For the most part, this problem is simple to fix on your own. For example, you should have no trouble tightening a connection or cleaning the battery terminals. For jobs that are more complicated, such as PCM replacement or update, you will need to visit a dealership or qualified service center. Here are some approximate repair costs you may deal with.

• Clean battery terminals – $5 to $15
• Tighten battery connections – $0 to $250
• Repair damaged wiring – $25 to $550
• Replace battery – $125 to $425
• Replace alternator – $300 to $950
• Update/replace PCM – $250 to $2,500

If you visually inspect the battery once a month, you can head off any problems with corrosion or disconnection.

A Mechanic’s Tips About The P1684 Code

In some cases, the P1684 trouble code can lead to damage to the CAN bus (Controller Area Network) . This is a serious issue to find that shouldn’t be taken lightly. For this reason, we recommend investing in a professional code scanner if you plan to do your own work. The cheap scanners can’t read this system effectively.

If you aren’t willing to invest in a better scanner, it would be best to let a professional work on this trouble code. Additionally, if the CAN bus system is damaged, reach out to a mechanic. 

Is code P1684 serious?

It’s not a big deal if you’ve just disconnected the battery. The code will reset after 50 start-ups or you can manually reset it with your compatible scanner. If you didn’t disconnect the battery, the code may indicate something more serious wrong with the car’s charging system. 

How do I fix error code P1684?

It depends on what caused it. If you disconnected the battery, you simply need to reset the code. Otherwise, you need to go through some diagnostic steps to determine what’s wrong. You may need to fix a faulty connection or replace the battery or alternator, depending on what has failed. 

Can I drive with a P1684 code?

If you’ve just disconnected the battery, you are probably safe to drive. The code should reset after the car starts up for the 50 th time. You can also reset the code with a compatible scanner. Otherwise, you should diagnose the problem and find out what’s wrong to determine if it is safe to drive or if a repair needs to happen sooner.

What Does An Internal ECM Failure Mean?

A complete ECM failure message would indicate that there’s no engine management for your vehicle. If this is the case, your vehicle may not start because it would be missing valuable inputs needed from the computer. The ECM may require an update or to be replaced, which is usually performed at the dealership. 

The trouble with the P1684 code is that the meaning of it depends heavily on what type of vehicle you drive. However, if you have a Dodge, Ram, Jeep or compatible vehicle, the meaning of it is pretty simple in most cases. It’s highly likely that you’ve disconnected the battery, either to replace it or clean it, and the computer recognized that it wasn’t connected. There’s nothing necessarily wrong that needs to be fixed.

However, there’s also the chance that you haven’t disconnected the battery, which would mean you have a problem to resolve. Follow our troubleshooting tips and repair the problem to get rid of the Check Engine Light and P1684 DTC. 

Categories: OBD Codes

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P1684 – Battery has been disconnected within the last 50 starts (Chrysler, Dodge, Jeep, and Plymouth)

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Manufacturer Specific Definitions for P1684

Table of contents, what does code p1684 mean, what are the common causes of code p1684, what are the symptoms of code p1684, how do you troubleshoot code p1684, codes related to p1684.

• Get Help with P1684

SPECIAL NOTES: Since carmakers are free to assign any problem to any P1XXX trouble code, it sometimes happens that a trouble code, OBD II code P1684 in this instance, can mean vastly different things depending on the problem any given carmaker has assigned to this code. One unfortunate consequence of this is that many generic code readers are sometimes not programmed with all the definitions in use for a particular P1XXX code, and in the case of P1684, there is a lot of confusion about which definition of this code relates to which manufacturer.

While this guide cannot provide detailed information on all the definitions of code P1684 (and the implications of those definitions), for all applications that use this code, it can provide some information on the two predominant definitions of the code, the first being OBD II code P1684 – “Battery has been disconnected within the last 50 starts” used by Chrysler, Dodge, Jeep , and Plymouth, and the other being OBD II code P1684 – “Metering Oil Pump Position Sensor Circuit Malfunction”, which is used by Mazda to indicate issues with lubrication on Wankel (rotary) engines.

Note though that there are still other definitions of code P1684 in current use, and some information on these definitions can be found in the Related Codes section of this guide. However, the information presented here is intended for general informational purposes only, and while every reasonable effort has been made to ensure that all details are correct, the information presented here should NOT be used in any diagnostic procedure(s) without proper reference to the application’s repair manual. END OF SPECIAL NOTES.

Overview of P1684 – “Battery has been disconnected within the last 50 starts”

OBD II fault code P1684 is a manufacturer specific code that is defined by Chrysler, Dodge, Jeep, and Plymouth, as “Battery has been disconnected within the last 50 starts”, and on these applications, code P1684 is set when the PCM (Powertrain Control Module) detects that the battery had been disconnected, or that full battery voltage had been lost during the last 50 start-up cycles.

Be aware though that the definition of code P1684 – “Battery has been disconnected within the last 50 starts” on Chrysler, Dodge, Jeep, and Plymouth applications does NOT mean that the battery has to be physically disconnected for the code to set. What this definition really means is that any problem or circumstance that causes full system (battery) voltage to be lost, or not to be available to any part of the electrical system or control module, can set this code.

Such circumstances could include defects or malfunctions of any component(s) of the charging system, PCM or other control module faults, damage to wiring that interrupts current flow to various control modules, or disconnection/replacement of the battery without having a memory saving device installed.

In many cases, the presence of code P1684 on Chrysler, Dodge, Jeep, or Plymouth applications means nothing more than an indication that either the battery was disconnected within the last 50 starts, or that system power had been lost for some reason during the last 50 starts. Moreover, the code will usually, but not always, be automatically reset, or cleared by the PCM if the code does not occur again within the 50 start-ups following the start-up event during which the code was set.

Common causes of code P1684 – “Battery has been disconnected within the last 50 starts” could include the following, but note that the causes listed here do not represent a complete list of all possible causes. Refer to the manual for the application being worked on for detailed information on all possible causes of this code for that particular application.

• Disconnecting the battery either with the engine running, or while the ignition was switched on
• Replacing the battery without first installing a memory saving device
• Defects in the charging system that cause under charging of the battery, and hence low system voltages
• Poor connections between battery terminals and battery posts, caused by corrosion or sloppy maintenance practices
• Loss of battery ground due to poor cable connections on either the engine of body, or both
• Failure to program the replacement battery’s technical details/information into the PCM where this is required
• Damage to wiring and/components that results in a loss of communication between two or more control modules that use the CAN bus system for communication of vital control inputs

The most common symptom of P1684 on affected applications is the presence of a stored trouble code, and an illuminated warning light. However, the immediate absence of serious symptoms, which could include driveability problems, should NOT be taken as an indication that no damage to the system had occurred, since some symptoms can take a while to manifest.

As stated previously, the battery does not have to physically disconnected for this code to set, but since the affects of losing power to the system can (and often does) produce erratic, unpredictable, and often-confusing symptoms, many mechanics (including professional technicians) often fail to make the connection between the loss of system power, and the sometimes-bewildering array of symptoms and additional fault codes that can come with this code, especially when the battery has not been replaced in the recent past. Moreover, disconnecting a battery terminal to “reset a computer” or to “clear some fault codes” can often induce, or greatly aggravate some symptoms.

Below are details of some symptoms that may, or may not, be present with code P1684, but note that this list is not exhaustive. Refer to the manual for the application being worked for detailed information on all possible symptoms that could affect that particular application-

Loss of KAM (Keep Alive Memory)

The KAM chip in a PCM holds all the values and settings the PCM had “learned” from the moment it was first energized. Typical values include fuel trim settings, transmission shift points, and all other settings that are adaptive. Moreover, the KAM chip also contains all fault codes ever stored, all their accompanying freeze frame data, and the results of all self-tests the PCM had ever run on the emission control system.

All that disconnecting the battery will do in an attempt to clear P1684 is to restore the original base, factory settings for the air/fuel mixture, idle speed, and a few other control functions. Thus, if the problem that set code P1684 is not resolved, the code will be set again, and although it may take a day or two, the code will return, along with all the additional codes and driveability issues that were present originally.

Vehicle will not pass an emissions test

Even if the battery had not been disconnected, the presence of P1684 means that the PCM is almost certainly not able to complete all, or any of the self-tests (readiness monitors) it needs to perform on the emission control system at every start-up.

Bear in mind that the test equipment at testing stations does not measure the emissions of a vehicle; what this equipment does is check that the vehicle’s own diagnostic functions are able to monitor its own emissions. Thus, while P1684 is present and the battery is disconnected to “clear” the code, the test equipment at the testing station will recognize both the attempt at circumvention of the law, and the fact that code P1684 is preventing the execution of self-tests, with the result that the vehicle will fail the emissions test for as long as P1684 is present, and its underlying cause is not resolved.

Transmission may not shift properly

Regardless of the cause of code P1684, the transmission module may have to be reprogrammed as a result of the loss of power. In some cases though, the TCM (Transmission Control Module) will relearn all the settings it had lost, but usually only after the code had been resolved and cleared with a professional grade code reader, or when the code does not set again within 50 starts from the start cycle during which the code was set. Relearning usually takes anywhere from 50, to 100 miles of driving.

BCM (Body Control Module) may be affected

Again, regardless of the cause of P1684, the loss of power to the system can cause the BCM to stop working correctly, and in some cases, to stop working altogether until the module is either reprogrammed, replaced, or allowed to relearn all the settings it had lost. Worse, though, on vehicles with CAN (Controller Area Network) systems, the BCM acts as the “gate keeper” module for the system so when this module fails, all communication between some, or all of the control modules on a vehicle can be interrupted, which means that nothing on the vehicle may work for as long as the underlying cause of code P1684 is not resolved.

Steering angle sensor may not work

Even a momentary loss of power could cause the steering angle sensor on affected vehicles to lose all its learned settings and values, which could affect safety systems like stability control and others, until the sensor had relearned its settings.

Anti-theft system may be disabled

Like with the steering angle sensor, even a momentary loss of power could disable the anti-theft system by causing the system to lose some, or all its learned and programmed settings.

NOTE #1: Note that the loss of system power does not always result in component damage or even noticeable symptoms, but when damage does occur, the required diagnostic/repair procedures are largely make and model specific. When diagnosing code P1684 on Chrysler, Dodge, Jeep, and Plymouth applications, always refer to the manual for the application being worked on for detailed information regarding this code (and its implications) as it relates to the affected application.

NOTE #2: In cases where symptoms do appear, these will almost always be indicated by codes other than P1684, but be aware that while some additional codes may be manufacturer specific, others are likely to be generic. Always refer to the manual for the application being worked on for detailed information on codes, and their likely symptoms, other than P1684.

NOTE #3: Since most manufacturers do not provide information on the possible harmful effects that go with disconnecting a vehicle battery or losing system power for whatever reason, it often happens that even professional mechanics and technicians sometimes make the mistake of disconnecting the negative battery terminal to “reset the computer”. “Resetting a computer” by disconnecting the battery is NOT recommended, unless the manual clearly states that disconnecting the battery is required at some point during the diagnostic process.

Record all fault codes present, as well as all available freeze frame data. This information could be of use should an intermittent fault be diagnosed later on.

NOTE: In some cases, the event(s) that set code P1684 on Chrysler, Dodge, Jeep, or Plymouth applications may have damaged the CAN bus (Controller Area Network) system, which is generally not accessible with cheap, generic code readers. Accessing this system is best accomplished with professional grade diagnostic equipment, but even so, interpreting the data requires above average diagnostic skills, as well as expert level knowledge of the application being worked on. If it is suspected that the CAN bus system may have sustained damage, the wiser option is to refer the vehicle for professional diagnosis and repair.

If there are other codes present along with P1684, it is likely that these codes are the result of P1684, rather than its cause. Therefore, note the order in which the additional codes were set and stored, and resolve these codes strictly in this order.

If only P1684 is present, consult the manual on the correct procedure to clear the code, especially if the battery had been replaced in the recent past.

NOTE: In some cases, a successful battery replacement requires that all the (technical) information about the battery be programmed into the PCM. This information usually includes the battery’s CCA rating, serial number, and other information the PCM needs to adapt the alternators’ charging rate as the battery ages. Make sure that if this information is required by the PCM, it has been entered correctly to avoid a recurrence of the problem.

If the code persists, it is likely that either the underlying cause of the code has not been resolved, or that not enough start cycles (50) have elapsed since the code was set. However, if there are no other codes (active or pending) present, it is almost certain that the code will reset automatically once the required number of start-up cycles have completed successfully. Operate the vehicle normally until the required number of start-up cycles have been reached, and rescan the system to see if the code is still present.

If the code returns, and especially if codes other than P1684 return as well, it is likely that an intermittent fault is present in the system. Be aware through that given the large number of possible causes of this code, finding and repairing an intermittent fault may be a near impossible mission for non-professional mechanics, and especially if the CAN bus system is involved.

If it is suspected that an intermittent fault is the cause of code P1684, the wisest option by far is to refer the vehicle to a dealer for professional diagnosis and repair, since even one mistake during the diagnostic process, such as disconnecting the battery while engine is running, or the ignition is switched “ON”, can cause irreparable damage to the vehicles’ entire electrical system.

NOTE: There are no codes directly related to P1684 – “Battery has been disconnected within the last 50 starts”, but many manufacturers have assigned different definitions to this code. Below are some examples, but take note that as with any manufacturer specific code, the manual for the application being worked should always be consulted for detailed information about the code as it relates to that particular application.

• P1684 – Fiat – “Motorised throttle (plausibility)”

This means that there is a discrepancy between the actual, and the desired or expected position of the throttle. The cause is often related to wiring between the throttle and the PCM.

• P1684 – Buick / Cadillac / Chevrolet / GMC / Oldsmobile / Pontiac / Saturn – “Driver 5 Line 4”

This definition of the code relates to PCM faults, and in particular, defects or malfunctions of drivers in the PCM that control devices like solenoids and relays. Be aware though that there is at least one other definition of code P1684 relating to Chevrolet, P1684 – “Transmission Control Module Power Up Temperature Sensor Performance”.

P1684 – Honda / Acura – “ Throttle Valve Return Spring Performance Problem”

On Honda applications, this code indicates a problem with throttle control due to a sticky, broken, or maladjusted return spring on the throttle.

• P1684 – Mini – “ Electronic throttle control monitor level 2/3 – clutch torque min error”

This is not a common code, and hence there is no reliable diagnostic/repair information available for it outside of the dealer network. Consult the manual for the application for detailed information.

• Volkswagen/Audi/Volvo – “ Contr. Unit Programming Communication Error”

Note that this code does not exist on vehicles made prior to 2002, but where it does occur on later models, it refers to programming issues within the PCM. Also, note that the VAG equivalent for this code is VAG DTC 18092.

SPECIAL NOTE: this list of alternative definitions of code P1684 may not be complete, or exhaustive. Moreover, the information regarding this code as displayed by generic code readers (and that of many other manufacturer specific codes), should be treated with a great deal of circumspection. For instance, some code readers will display code P1684 as “Metering oil pump position sensor circuit” on some Ford applications, even though Ford products do NOT have oil-metering pumps. Oil metering pumps are only used on Mazda applications that are fitted with Wankel (rotary) engines, about which more can be read in the Mazda area on this site . END OF SPECIAL NOTES.

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P1684 Code On Chrysler – Meaning, Symptoms, Causes & Fixes!

The p1684 code on Chrysler vehicles is a common trouble code that indicates problems with the vehicle’s battery, alternator, or wiring system. This can make the engine stop running.

If you have difficulty with this, it is advised that you seek professional assistance from a qualified auto technician immediately.

P1684 Code On Chrysler – What Does It Mean?

The p1684 Code on Chrysler vehicles indicates a communication failure between the main computer and subsystems within the vehicle.

This code often indicates trouble with the internal wiring in your car, such as corrosion or a short circuit.

When this particular code pops up, it’s prudent to bring your vehicle into an expert service center for an examination and repair without delay.

Otherwise, you could be in a tough situation if something wears down too severely and the entire system breaks down.

So if you’ve identified this code on your Chrysler, make sure to get it checked out without delay!

The Symptoms Of A P1684 Code On Chrysler

When a P1684 code on Chrysler is triggered, it is an indication that there is an internal logic problem in the control module for the engine.

Depending on your car type, there can be a variety of symptoms for malfunctioning.

From dashboard warning lights to inaccurate readings in the instruments, anything and everything could indicate that something isn’t right. Some major signs include:

1. Check Engine Light Is On:

Have you noticed that the check engine light in your Chrysler has come on? This can be a major concern if it’s been activated, as it indicates there is a problem with your vehicle.

There might be something wrong with the car, or it might just need a small fix. Either way, take it to a professional to have them read the p1684 code and tell you what is wrong.

Once you have that information, you can fix the problem and improve your car’s performance for better safety on the road .

2. Vehicle Is Stalling Or Not Starting:

If your car is not starting , you should first figure out what is causing the problem. One reason might be an error code called P1684. This usually happens with Chrysler models.

This code means that the computer doesn’t have enough power. This is usually because the battery cables are corroded or loose or there is some other problem with the wiring.

Before attempting to fix this issue yourself, it is important to acquire the expertise of a trusted auto mechanic and have them diagnose the exact cause of your vehicle’s problem.

3. Poor Fuel Economy:

Poor fuel economy can be a big problem both financially and environmentally. Inefficient vehicles waste precious resources while costing you considerable money in petrol.

The P1684 Code on Chrysler vehicles is one reason for poor fuel economy.

This code is a general indicator of either a bad alternator or a weak battery, causing the vehicle to burn more gasoline than usual and leading to costly losses in terms of fuel efficiency.

If you’ve experienced this issue with your Chrysler, having it checked out by an experienced technician for efficient car performance and reduced environmental impact may be beneficial.

4. Hesitation While Accelerating:

Something might be wrong if you are pushing down on the gas pedal and the car is not going as fast as you want.

Many people with a Chrysler specifically have experienced this issue due to the p1684 code.

This code suggests that an issue with the internal computer system of your car is causing the hesitation, and it’s important to take your car in for diagnosis and repair right away.

While minor issues vary with vehicle make and model, ensuring your car is running properly should always be a priority for your safety on the road.

5. Trouble Codes P1684, P0171, And P0300:

If you own a Chrysler and your “Check Engine” light is on, it could be one of several possible engine codes.

P1684, P0171, and P0300 are all codes that might appear on a Chrysler car. P1684 means there is a problem with how the car is talking to one of its parts.

P0171 is usually caused when the fuel mixture is too lean, or there is too much air.

Lastly, P0300 could indicate several engine problems, such as misfiring cylinders or ignition coils needing replacement.

Figuring out what exactly is causing each code can be tricky – so it’s best to have an experienced mechanic diagnose the issue and provide repairs.

Potential Causes Of The P1684 Code On Chrysler

The P1684 Code on Chrysler is a kind of problem that a lot of things could cause.

This includes electrical problems with the battery or part that makes electricity, bad wiring, damaged fuses or relays, as well as dead or corroded battery cables and terminals.

Malfunctioning vehicle sensors such as camshaft position (CMP), crankshaft position (CKP), and oxygen (O2) sensors can also lead to the activation of this code.

Things like low-quality gasoline or engine overheating can cause the P1684 code. Therefore, it’s important to consider all potential causes before fixing the problem.

1. A Defective Ignition Switch May cause P1684 Issue:

A defective ignition switch may cause the P1684 Code on Chrysler vehicles.

This means your car is not properly registering to turn on or off the ignition switch when you start or stop the engine.

If this issue is left unresolved, it can lead to expensive repairs down the road, as the car will no longer be able to detect the proper position of the ignition switch.

It is best to have this problem checked out and fixed immediately to avoid further damage and more costly repairs.

2. Faulty Wiring In The Vehicle May Be Causing The Problem:

Faulty wiring in the vehicle may be causing intermittent issues with your car, such as difficulty starting, lack of power, or even engine stalling.

This problem is often flagged as P1684 on Chrysler vehicles, indicating a malfunctioning control module.

If you receive this code from your vehicle’s onboard diagnostics system, it is important to get the wiring inspected and repaired immediately by a certified mechanic.

Doing so can help prevent more costly repairs and ensure that your vehicle functions properly for a long time.

3. The Engine Control Module (ECM) May Be Malfunctioning:

If you own a Chrysler and your check engine light is on , it could be a sign of a malfunctioning engine control module (ECM).

The ECM is like the brain of your vehicle. It monitors and regulates its performance.

If something is awry with the ECM – which can occur due to any number of issues – it could lead to sluggish driving or even complete refusal by your car to start up altogether.

If code p1684 appears upon diagnosis, chances are that your ECM has gone awry, and you may need to replace it soon.

Although this might initially seem intimidating, seeking professional guidance will help you get back on the road in no time!

4. There Could Be An Issue With The Fuel Pump Or Injectors:

If your car reports a p1684 code on Chrysler vehicles, it could indicate an issue with the fuel pump or injectors.

If the fuel pump is not working as it should, then you may be experiencing a decrease in engine performance or poor acceleration.

Additionally, if the fuel injectors are malfunctioning, you may find that your car cannot properly time ignition and control air/fuel delivery correctly.

Both of these problems could lead to a decrease in the engine’s overall efficiency and can even damage vital components if left unchecked for a long time.

5. The Problem Could Be Due To A Bad Crankshaft Position Sensor:

If you have a P1684 code on your Chrysler vehicle, there is a chance that the problem could be due to a faulty crankshaft position sensor.

The crankshaft’s concluding component informs the car of when to commence running, as well as how rapidly it should chug along.

If this sensor has become damaged or clogged over time, it can lead to a communication issue between your engine computer and the crankshaft.

If detected early, replacing this part could save you thousands in repair bills by preventing more serious engine damage from occurring down the road.

How To Troubleshoot And Diagnose P1684 Code On Chrysler?

Diagnosing and troubleshooting code P1684 in a Chrysler engine can be quite challenging. It is important to consider all potential causes for the code to repair the issue properly.

Start by retrieving stored codes from the powertrain control module using a scanner compatible with Chrysler vehicles.

Once faults have been identified, use an available diagnostic manual to help isolate other issues that may prevent fault codes from being triggered and cleared correctly.

Check all sensors related to triggering the fault code and make sure they are functioning correctly and connected securely.

It is essential to inspect your code for any issues thoroughly. If something appears faulty, replace it immediately, as this will quickly rectify the problem.

Some Tips For Preventing P1684 Code On Chrysler

Preventing the P1684 code from happening on your Chrysler vehicle can seem daunting, but fortunately, there are some steps you can take to give yourself peace of mind.

Regularly check all power and grounds for your vehicle with a multimeter , specifically under the steering column for circuit grounds and at the battery for power.

If any of these readings are out-of-spec, have them replaced as soon as possible.

Additionally, regularly change the spark plugs and inspect engine coolant levels – low coolant could lead to misfires, while high temperatures may even cause circuits to be short.

Following these tips will help ensure that your Chrysler runs smoothly and that you don’t have any unwanted surprises down the line while driving!

Conclusion:

The p1684 Code on Chrysler vehicles warns that the battery has suffered some electrical system malfunction.

This code can indicate wiring issues, faulty or corroded connections between battery cables and terminals, a damaged or dying alternator, and other possible causes.

Locating this issue’s source as soon as possible is important to ensure your alternator does not become completely drained.

Taking your vehicle to an experienced mechanic for diagnosis and repair is recommended for all electrical issues with your vehicle, such as the p1684 code on Chrysler.

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P1684 code — how to fix error fast

Equip yourself with insights on the p1684 code. navigate its implications for a smooth driving experience..

There are many codes that may appear on an OBD2 scanner, but the code P1684 is one of the most common ones you may spot for your car. Upon the first symptoms of the code and reading it on a scanner tool, you may assume it has something to do with the electrical system of the car, but what about the true P1684 code meaning ?

To help you figure out all the important implications of the code, we decided to give you a tour through this comprehensive guide. We’ll talk about the possible reasons behind the code, ways of diagnosing it, and what you can do to fix it with or without professional help.

Why you can trust REREV’s OBD2 code advice: Our automotive expert researchers with experienced mechanics undertakes a thorough research methodology to deliver precise insights on OBD codes. Find out more about OBD2 codes research process. .

What does the P1684 code mean?

The P1684 code is a diagnostic trouble code that is related to the battery . Specifically, this code indicates that the battery has been disconnected within the past 50 engine starts.

This code is important to understand because it can cause other issues with the vehicle’s systems, such as transmission and emissions. Additionally, if this code is not addressed, it can cause the vehicle to fail an emissions test.

What causes the P1684 code?

There are several potential causes of the P1684 code. One of the most common causes is a battery that has been disconnected or replaced recently. This can cause the code to appear because the vehicle’s computer system has lost its stored data. Other potential causes include the following:

Problems with the battery or its connections

A weak or dead battery can cause the power supply to be interrupted and trigger the P1684 code. Also, corroded or loose battery connections can also cause the power supply to be disrupted and trigger the P1684 code.

Faulty alternator

If the alternator is not charging the battery properly, it can cause the power supply to be interrupted and trigger the P1684 code. This can also happen if you’ve only driven your car for short periods over and over again and that prevented the alternator from properly charging the battery.

Fuses and wiring issues

A blown fuse in the power supply circuit can cause the power supply to be interrupted and trigger the P1684 code. Damaged or disconnected wiring in the power supply circuit can also cause the power supply to be interrupted and trigger the P1684 code.

Which car models does the P1684 code affect the most?

The P1684 code is not specific to any particular vehicle make or model . However, some car models may be more prone to this issue than others. Some of the vehicles that have had reported issues with the P1684 code include the following:

• Chrysler PT Cruiser : The PT Cruiser is a compact car that was produced by Chrysler from 2000 to 2010. It is one of the models that are most commonly associated with the P1684 code.
• Dodge Neon:: The Dodge Neon is a compact car that was produced by Dodge from 1995 to 2005. It is another model that is commonly associated with the P1684 code.
• Chrysler Stratus: This car is one of the most commonly affected vehicles as it often had issues with corroded battery terminals and connections as reported by owners.

How to diagnose the P1684 code

In most cases, diagnosing code P1684 will be done by a professional mechanic and with the usage of professional diagnostic equipment. However, you can also use a few other methods to diagnose the code yourself, and we’ll make the job easier for you by listing all the important methods of diagnosing it:

Scan the vehicle’s computer

The first step in diagnosing the P1684 code is to scan the vehicle’s computer using an OBD-II scanner. This may also give you a few other codes that are related to this one and that leads to an easier time diagnosing the problem at its core.

Check the battery

The next step is to check the battery and make sure that it is fully charged and in good condition. A weak or dead battery can cause the P1684 code to be triggered.

Inspect the battery connections

Check for loose or corroded connections at the battery terminals, as this can also cause the P1684 code to be triggered.

Check the wiring and fuses

Inspect all of the wiring and fuses in the power supply circuit, as damaged or disconnected wiring or blown fuses can cause the P1684 code to be triggered.

How to fix the P1684 code

Fixing the P1684 code will depend on the underlying cause of the issue. If the code is being caused by a disconnected or faulty battery, the solution may be as simple as reconnecting the battery or replacing it. Since this can be a bit expensive, we’ll give you an overview of the most common methods of fixing this issue and erasing the code so you can deal with what’s causing the issue for your car:

Repair battery connections if needed

If the battery connections are loose or corroded, they will need to be repaired or replaced to fix the P1684 code.

Replace a faulty alternator

If the alternator is not charging the battery properly, it may need to be replaced to fix the P1684 code. Another sign of this issue is if you spot a battery discharge warning on the dash, which could point to a faulty alternator so you can rest assured that this is the cause of the problem.

Replace blown fuses and check the wiring

If a blown fuse is causing the power supply to be interrupted, it will need to be replaced to fix the P1684 code. On the other hand, if damaged or disconnected wiring is causing the power supply to be interrupted, it will need to be repaired or replaced to fix the code.

Replace a faulty control module

If all of these steps have been tried and no issues have been found, it may be necessary to replace the control module itself to fix the P1684 code.

How to prevent the P1684 code

Fixing the P1684 code will depend on the underlying cause of the issue. Here’s what you can do in general to deal with this code depending on the reason behind it:

• Check the battery’s voltage and charge
• Look for signs of poor electrical connection supply
• Replace battery-related components on time
• Check the alternator and starter motor for damage

The cost of fixing the P1684 code will vary depending on the cause of the issue and the cost of parts and labor. If the issue is too complex, it is recommended that drivers seek professional help.

The P1684 code can be a frustrating issue for drivers to deal with. However, by understanding what the code means, what causes it, and how it can be fixed, you can take steps to prevent this issue from occurring. We hope that this guide will give you an idea of how to accomplish this, so make sure to follow our lead on fixing and preventing the code in the future.

Is the P1684 code serious?

While the P1684 code is not a critical issue, it should be addressed promptly to ensure that your vehicle is running properly.

Can I continue to drive my car with the P1684 code?

If your vehicle is running properly, you can continue to drive it with the P1684 code. However, if you experience any other issues, it’s important to have your vehicle inspected by a qualified mechanic.

How do I fix the P1684 code?

Fixing the P1684 code will depend on the underlying cause of the issue. It may involve recharging or replacing the battery, repairing or replacing wiring, or replacing a faulty control module.

Filip is a lifelong car enthusiast with over 3 years of experience writing about cars and had worked as a mechanic apprentice for over 5 years, gaining hands-on expertise in automotive mechanics. At REREV, he combines his passion for cars with his comprehensive knowledge to provide readers with a unique blend of technical insight and engaging storytelling that sets the bar high for automotive content.

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P1684 – CHRYSLER

Code : P1684 Make : CHRYSLER Description : P1684 CHRYSLER Battery Power To Module Disconnected Possible causes : – Battery was recently disconnected – Transmission Control Module (TCM) was replaced or disconnected – Faulty Transmission Control Module (TCM) – Transmission Control Module (TCM) harness is open or shorted – Transmission Control Module (TCM) circuit poor elect Solutions : – Carry out a Reset via CarDiag – Choose a better quality fuel – Check that the tank cap is securely closed – Check the oil level and add more if it is lower than MAX – Restart an Automatic diagnostic via CarDiag – If the fault persists, you can check the “Possible causes” listed above : visually inspect (by yourself (tutorials to come) or by a professional) the wiring harness and the associated connectors, check for damaged components, and look for broken, bent, pushed, or corroded connector pins.

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P1684 - Código de falla OBD2

Manuales de reparación para el código P1684

Fallas del código P1684 por marcas

P1684 BUICK, CADILLAC, CHEVROLET, GMC: RENDIMIENTO DEL SENSOR DE TEMPERATURA DE ENCENDIDO DEL MÓDULO DE CONTROL DE TRANSMISIÓN

P1684 BUICK, CADILLAC, CHEVROLET, GMC: TRANSMISSION CONTROL MODULE POWER UP TEMPERATURE SENSOR PERFORMANCE

Descripción del código DTC P1684

El Módulo de control de la transmisión (TCM) es un componente electrónico encargado de interpretar las señales eléctricas de los sensores y otros dispositivos relacionados al desempeño de la transmisión. Hay algunos de estos sensores que trabajan estrechamente con el TCM , los cuales recopilan información sobre el rendimiento del vehículo y posteriormente envían dichos datos al TCM, quien los emplea para el cálculo de cambio de marcha más apropiado.

El Sensor de temperatura de encendido del TCM que se instala dentro del conjunto de la válvula de solenoide de control (con cuerpo y TCM), no tiene piezas que puedan repararse. Tiene como función proporcionar la temperatura del TCM cuando dicho controlador enciende. Estas lecturas se emplean en diversas rutinas de desplazamiento y diagnóstico del software del módulo de control. Una falla de este sistema es manejada internamente en el TCM , razón por la cual no tiene ningún circuito externo involucrado.

Al configurarse el código de diagnóstico P1684 OBD2 en los vehículos de los fabricantes Buick, Cadillac, Chevrolet o GMC, significa que en el circuito del Sensor de temperatura de encendido del TCM se han descubierto problemas de rendimiento.

El código P1684 es común en: Chrysler 300, Chrysler Concorde, Chrysler LHS, Chrysler Pacifica, Chrysler PT Cruiser, Chrysler Sebring, Chrysler Town & Country, Chrysler Voyager, Dodge Caravan, Dodge Intrepid, Dodge Neon, Dodge Ram 1500, Dodge Stratus, Jeep Liberty, Jeep Wrangler y otras marcas.

Síntomas del código de falla P1684

• Lámpara Check Engine   encendida.
• Al tratar de cambiar de una marcha más baja durante la aceleración la respuesta es atrasada.
• No se puede salir del modo neutral.
• El cambio de una marcha a otra es aleatorio.

Causas del código OBD2 P1684

Los factores por los que se configura el código de falla P1684 OBDII son:

• Otros códigos DTC que indiquen fallas del TCM puede que causen el establecimiento del P1684 .
• El conjunto del Sensor de temperatura de encendido del TCM podría tener daños.
• Puede que el Transmission Control Module presente daños.

Posibles soluciones del código DTC P1684

Para solucionar el código DTC P1684 OBD2 considera lo siguiente:

• Como primer paso, consulta los Boletines de servicio técnico . El problema que está presentado tu vehículo puede ser conocido por el fabricante y en estos boletines se incluye información de mucha utilidad.
• Utiliza un scanner automotriz para comprobar si están configurados otros códigos de error , en especial aquellos que señalan fallas específicas del TCM . Si es así, diagnostica primero dichos códigos.
• Si no descubres códigos adicionales al P1684 es probable que el TCM tenga errores de programación u otros daños. Es recomendable que asistas a un centro de servicio avanzado.

Aplicación para solucionar cualquier falla automotriz

Códigos relacionados al p1684.

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New modification of Russian VVER-440 fuel loaded at Paks NPP in Hungary

DECEMBER 14, 2020 — After the recent refueling at power unit 3 of the Hungarian Paks NPP, its VVER-440 reactor has been loaded with a batch of fresh fuel including 18 fuel bundles of the new modification. The new fuel will be introduced at all four operating power units of the Paks NPP, and the amount of new-modification bundles in each refueling will be increased gradually.

Development of the new VVER-440 fuel modification was completed in 2020 under the contract between TVEL JSC and MVM Paks NPP Ltd. Its introduction would optimize the hydro-uranium ratio in the reactor core, enabling to increase the efficiency of fuel usage and advance the economic performance of the power plant operation. All VVER-440 fuel modifications are manufactured at the Elemash Machine-Building Plant, a facility of TVEL Fuel Company in Elektrostal, Moscow Region.

“Introduction of a new fuel is an option to improve technical and economic performance of a nuclear power plant without substantial investment. We are actively engaged in development of new models and modifications of VVER-440 fuel for power plants in Europe. The projects of the new fuels for Loviisa NPP in Finland, Dukovany NPP in the Czech Republic, Mochovce and Bohunice NPPs in Slovakia, are currently at various stages of implementation. Despite the same reactor model, these projects are quite different technically and conceptually, since we take into account the individual needs and requirements of our customers,” commented Natalia Nikipelova, President of TVEL JSC.

For reference:

The project of development and validation of the new fuel has been accomplished with participation of a number of Russian nuclear industry enterprises, such as OKB Gidropress (a part of Rosatom machine-building division Atomenergomash), Bochvar Institute (material science research facility of TVEL Fuel Company), Elemash Machine-building plant and Kurchatov Institute national research center. At the site of OKB Gidropress research and experiment facility, the new fuel passed a range of hydraulic, longevity and vibration tests.

Paks NPP is the only functioning nuclear power plant in Hungary with total installed capacity 2000 MWe. It operates four similar units powered by VVER-440 reactors and commissioned one by one in 1982-1987. Currently, Paks NPP is the only VVER-440 plant in the world operating in extended 15-monthes fuel cycle. The power plant produces about 15 bln kWh annually, about a half of electric power generation in Hungary. In 2018, the project of increasing the duration of Paks NPP fuel cycle won the European competition Quality Innovation Award in the nomination “Innovations of large enterprises”. Russian engineers from TVEL JSC, Kurchatov Institute, OKB Gidropress, Bochvar Institute and Elemash Machine-building plant provided assistance to the Hungarian colleagues in accomplishment of the project.

  TVEL Fuel Company of Rosatom incorporates enterprises for the fabrication of nuclear fuel, conversion and enrichment of uranium, production of gas centrifuges, as well as research and design organizations. It is the only supplier of nuclear fuel for Russian nuclear power plants. TVEL Fuel Company of Rosatom provides nuclear fuel for 73 power reactors in 13 countries worldwide, research reactors in eight countries, as well as transport reactors of the Russian nuclear fleet. Every sixth power reactor in the world operates on fuel manufactured by TVEL.  www.tvel.ru  

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what does fault code P1684 mean?

may come back Click to expand...

Discoverer said: If battery is old (SOH <=85%) and short trips without stationary charging then P1684 Click to expand...

Yes. It's just stored in memory and no check engine light on the dash. May be one day a battery was discharged.  

Discoverer said: Yes. It's just stored in memory and no check engine light on the dash. May be one day a battery was discharged. Click to expand...

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