Ignition Coil B Primary/Secondary Circuit Malfunction
The P0352 code indicates a malfunction in the primary or secondary circuit of ignition coil B. The powertrain control module (PCM) monitors the voltage and current in the coil's primary circuit. If the PCM detects an open, short, or excessive resistance in the coil or its wiring, it sets this code. This can cause misfires, reduced engine performance, and increased emissions.
01. Most Common Causes
- Faulty ignition coil B
- Open or shorted wiring in the coil circuit
- Poor electrical connection at the coil connector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Engine misfire or rough idle
- Check Engine Light illuminated
- Reduced engine power and acceleration
- Increased fuel consumption
03. 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 coil (e.g., coil A) and clear codes. If the code moves to the swapped cylinder, replace the coil.
Step 4: Test the coil's primary and secondary resistance with a multimeter and compare to manufacturer specifications.
Step 5: Check for power and ground at the coil connector with the ignition on. If missing, repair wiring or replace PCM.
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 other engine components. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
Typically $50-$150 for a DIY coil replacement. Shop labor may add $50-$100, totaling $100-$250.