Ignition Coil Secondary Circuit Malfunction
The P2323 code indicates a problem in the secondary circuit of ignition coil 'C' (or a specific coil depending on manufacturer). This circuit includes the coil itself, spark plug wires, and spark plug. A fault here can cause weak or no spark, leading to misfires, reduced power, and increased emissions. Common causes include a failing ignition coil, worn spark plugs, damaged wiring, or a faulty ECM.
01. Most Common Causes
- Faulty ignition coil
- Worn or fouled spark plugs
- Damaged spark plug wires or boots
- Open or shorted wiring in the secondary circuit
- Faulty engine control module (ECM)
02. Symptoms You Will Notice
- Engine misfire or rough idle
- Check Engine Light illuminated
- Reduced engine power and acceleration
- Poor fuel economy
- Engine hesitation or stalling
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect ignition coil, spark plugs, and wires for visible damage.
Step 3: Swap ignition coil with another cylinder to see if misfire moves.
Step 4: Test coil primary and secondary resistance with a multimeter.
Step 5: Check for power and ground at the coil connector.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a misfire can damage the catalytic converter and reduce fuel economy.
How much does it cost to fix?▼
Typically $50-$150 for a DIY coil replacement; labor at a shop adds $100-$200.