Ignition Coil B Primary/Secondary Circuit Malfunction
The P0352 code indicates a malfunction in the primary or secondary circuit of ignition coil B. This coil is responsible for generating the high voltage needed to fire the spark plug for cylinder 2. The Powertrain Control Module (PCM) monitors the coil's primary circuit for proper voltage and current. When it detects an open, short, or excessive resistance, it sets this code. Common causes include a faulty ignition coil, damaged wiring, or a poor electrical connection. This can lead to misfires, reduced engine performance, and increased emissions.
1. Most Common Causes
- Faulty ignition coil B
- Open or shorted wiring in the coil circuit
- Poor electrical connection at the coil or PCM
- Failed PCM (rare)
2. Symptoms You Will Notice
- Engine misfire (especially cylinder 2)
- Check Engine Light illuminated
- Rough idle or hesitation during acceleration
- Decreased fuel economy
3. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P0352 is present. Check for other related codes.
Step 2: Visually inspect ignition coil B and its wiring for damage, corrosion, or loose connections.
Step 3: Swap coil B with another cylinder's coil. If the misfire moves, replace the coil.
Step 4: Test the coil's power and ground circuits using a multimeter. Repair any open or short.
Step 5: If all checks pass, test the PCM's coil driver circuit. Replace PCM if faulty.
4. 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 engine performance. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
Typically $50-$150 for a DIY replacement of the ignition coil. Professional repair may cost $100-$250 including labor.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.