P1684 code — how to fix error fast

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.

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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.

Our take

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.