Ignition Coil L Primary/Secondary Circuit Malfunction
Code P0362 indicates a malfunction in the primary or secondary circuit of ignition coil L (typically coil 12 on a V6 or V8 engine). The Powertrain Control Module (PCM) detects an abnormal voltage or current in the coil's primary winding or a lack of spark from the secondary winding. This can cause misfires, reduced engine performance, and increased emissions.
01. Most Common Causes
- Faulty ignition coil L
- Open or shorted wiring in the coil circuit
- Failed PCM (rare)
- Poor electrical connection at the coil connector
02. Symptoms You Will Notice
- Engine misfire or rough idle
- Check Engine Light illuminated
- Reduced power and acceleration
- Increased fuel consumption
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect ignition coil L and its wiring for damage or corrosion.
Step 3: Swap coil L with another cylinder and see if the code moves.
Step 4: Test coil primary and secondary resistance with a multimeter.
Step 5: Check for power and ground at the coil connector with the key on.
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 cause poor drivability.
How much does it cost to fix?▼
Replacing the ignition coil typically costs $150-$300 including parts and labor.