Ignition Coil Secondary Circuit Malfunction (P2320)
The P2320 code indicates a problem in the secondary circuit of ignition coil 'E' (or a specific coil depending on manufacturer). The Powertrain Control Module (PCM) has detected an abnormal voltage or current in the coil's secondary winding, which can cause weak or no spark. This often leads to misfires, reduced engine performance, and increased emissions.
01. Most Common Causes
- Faulty ignition coil
- Open or shorted secondary wiring
- Damaged spark plug or boot
- PCM internal failure (rare)
02. Symptoms You Will Notice
- Engine misfire or rough idle
- Check Engine Light illuminated
- Reduced power and acceleration
- Poor fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and note freeze frame data.
Step 2: Visually inspect ignition coil, wires, and spark plug for damage.
Step 3: Swap coil with another cylinder and see if misfire follows.
Step 4: Test coil primary and secondary resistance with a multimeter.
Step 5: Check for 12V power and ground at 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; shop labor may add $100-$200.