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

Written By: Terrence Hines
Category: Engine

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.

P1684 Code On Chrysler - What Does It Mean?

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.

Hesitation While Accelerating

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.

P1684 Code On Chrysler

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 Problem Could Be Due To A Bad 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!


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.

Terrence Hines

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