How to Fix P1682 Code: A Comprehensive Guide to Clearing the Code and Keeping Your Engine Running Smoothly


P1682 code is a common issue faced by vehicle owners, causing the check engine light to turn on and signaling a problem related to the ignition system. The code indicates that there is a manufacturer-specific fault detected in the ignition switch or its circuit. This problem can lead to poor vehicle performance, difficulty starting, stalling, or complete failure to start. In this article, we will discuss the possible causes, symptoms, and actionable tips to help you fix the P1682 code and get your vehicle back on the road.

What is P1682 Code?

The P1682 code refers to a problem with the ignition system, specifically the 5-volt supply voltage for the ignition switch. The code is triggered when there is an issue in the electrical circuit that prevents it from providing the necessary 5 volts to the ignition switch. This can be due to a wiring issue, a problem with the ignition switch, or a problem with the powertrain control module (PCM).

Causes of P1682 Code

There are several possible causes for the P1682 code, including:

1. Faulty ignition switch
2. Damaged or corroded wiring in the ignition switch circuit
3. Loose or damaged connectors in the ignition switch circuit
4. Failed powertrain control module (PCM)

Symptoms of P1682 Code

When the P1682 code is triggered, you may experience one or more of the following symptoms:

1. Check engine light on
2. Poor engine performance
3. Difficulty starting the vehicle
4. Stalling or misfiring while driving
5. Complete failure to start

It is crucial to address these issues as soon as the symptoms appear, as ignoring them can lead to more severe consequences and expensive repairs in the long run.

How to Fix P1682 Code

Use the following steps to diagnose and fix the P1682 code:

1. Use a code scanner to confirm: First and foremost, use an OBD-II scanner to read the diagnostic trouble codes (DTCs) from your vehicle’s computer. This can help you confirm the presence of the P1682 code and any other related issues.

2. Inspect the ignition switch: Check the ignition switch for any signs of wear, damage, or corrosion. Replace it if necessary.

3. Inspect the wiring and connectors: Check the wiring and connectors in the ignition switch circuit for any signs of damage or corrosion. Replace or repair any damaged or corroded components.

– Disconnect the battery before performing any electrical repairs to ensure safety.
– Consult your vehicle’s service manual for the correct wiring diagrams and connector locations.

4. Check the powertrain control module (PCM): If the previous steps do not reveal any issues, the problem could be with the PCM. A fault in the PCM can cause this code, but it is relatively rare. It is essential to properly diagnose the PCM before replacing it, as it can be a costly component. Consult a professional technician if you suspect the PCM is the root cause.

5. Clear the code and test-drive: Once you have addressed the issues above, use the OBD-II scanner to clear the code. Drive the vehicle for a short period to see if the code reappears.

– If the code does not return and the symptoms have resolved, the issue has likely been fixed.
– If the code returns, repeat the diagnostic steps above, and seek professional help if necessary.


The P1682 code can be a frustrating issue for vehicle owners, but, with the right knowledge and tools, fixing it is achievable. By identifying the cause and taking the appropriate step-by-step actions, you can resolve the problem and ensure your vehicle’s reliable performance. Remember to always consult your vehicle’s service manual and reach out to a professional technician if you are unsure of any steps in the process.

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