Ignition Coil L Primary/Secondary Circuit Malfunction
The P0362 code indicates a malfunction in the primary or secondary circuit of ignition coil L. This coil is responsible for firing cylinder 12 (or the last cylinder in the firing order, depending on engine configuration). The Powertrain Control Module (PCM) detects an abnormal voltage or resistance in the coil's circuit, which can cause misfires, reduced engine performance, and increased emissions.
1. Most Common Causes
- Faulty ignition coil L
- Open or shorted wiring in the coil circuit
- Damaged connector or poor electrical connection
- Failed PCM (rare)
2. Symptoms You Will Notice
- Engine misfire on cylinder 12
- Check Engine Light illuminated
- Rough idle or hesitation during acceleration
- Decreased fuel economy
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect ignition coil L and its wiring for damage or corrosion.
Step 3: Test coil primary and secondary resistance with a multimeter and compare to specifications.
Step 4: Swap coil L with another cylinder and see if the code follows the coil.
Step 5: Check for power and ground at the coil connector with the ignition on.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause misfires, catalytic converter damage, and poor engine performance. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $150 to $300, including parts (ignition coil) and labor. Diagnostic fees may be extra.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.