P2331 Fault Code

Ignition Coil K Primary Control Circuit High

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2331 fault code indicates a high voltage condition in the ignition coil K primary control circuit. This code is typically set when the Engine Control Module (ECM) detects a voltage level that exceeds the expected range for the ignition coil control circuit. Anomalies in this circuit can lead to poor engine performance and starting issues.

What are the symptoms of the P2331 code?

Symptoms associated with the P2331 code may include:

• Engine misfires or hesitation during acceleration.
• Difficulty starting the engine.
• Rough idle or poor engine performance.
• Check Engine Light (CEL) illuminated on the dashboard.
• Increased emissions due to incomplete combustion.

What causes the P2331 code?

Common causes of the P2331 code can include:

• A short circuit in the ignition coil wiring or connectors.
• A faulty ignition coil.
• Issues with the Engine Control Module (ECM) itself.
• Corroded connections or damaged wiring in the ignition system.
• Faulty relay or associated components affecting the ignition coil circuit.

How to fix P2331?

To resolve the P2331 fault code, follow these steps:

• Inspect the ignition coil K wiring and connectors for any visible damage or corrosion.
• Use a multimeter to test the voltage and ground connections at the ignition coil to ensure they are within specifications.
• Replace the faulty ignition coil if testing indicates it is malfunctioning.
• Repair any wiring issues, shorts, or poor connections found during the inspection.
• Clear the fault code and perform a test drive to ensure the issue is resolved and the check engine light does not reappear.