P2331 Code: Ignition Coil K Primary Control Circuit High

P2331 is a generic code related to one of the ignition coils in your vehicle. Know more about it through this article.

What Does the P2331 Code Mean?

Diagnostic trouble code (DTC) P2331 stands for “Ignition Coil K Primary Control Circuit High.” The code is set once the powertrain control module (PCM) has detected a voltage in the ignition coil K circuit that’s higher than the set range. You can refer to your vehicle’s manual to determine which ignition coil is designated “K” for your specific application.

If you have significant DIY auto repair experience, you can get more related information in our advanced discussion about how the primary and secondary windings of ignition coils work.

You may also watch this video to understand how ignition coil works:

Note: The definition of code P2331 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What Are the Common Causes of the P2331 Code?

• Bad relay
• Blown fuse
• PCM failure
• Wiring issues
• Malfunctioning ignition coil
• Bad crankshaft or camshaft wiring or sensor

What Are the Possible Symptoms of the P2331 Code?

• Poor engine performance
• Engine misfires
• Poor fuel economy
• Fuel injector operation may be disabled on the affected cylinder

How to Diagnose the P2331 Code

Although DTC P2331 is a generic trouble code, it does not have a one-size-fits-all solution. The steps for diagnosing this trouble code may differ depending on the make and model of the vehicle.

To diagnose the problem, you’ll need specific tools as well as up-to-date technical information about the ignition system. If you’re not familiar with vehicle repair and diagnosis, leave it to a reputable mechanic. Otherwise, you are free to investigate the problem on your own.

How to Fix the P2331 Code

Clearing the P2331 error code can be challenging, especially if you lack the necessary DIY skills and automotive knowledge. If this is the case, you should take your vehicle to an auto repair shop and let a professional handle the problem.

If you’re confident in your ability to clear the code on your own, make sure you have the correct repair guide on hand before you begin. You could look into vehicle-specific guides from places like Chilton or an ALLDATA subscription.