What Does P0352 Mean?
The ECM has detected a malfunction in the primary or secondary circuit of ignition coil B, which typically serves cylinder #2. The ECM monitors the coil driver circuit for proper current flow and feedback, and has determined that coil B is not operating within expected parameters. This will cause a continuous misfire on the associated cylinder, resulting in rough idle, reduced power, and elevated hydrocarbon emissions.
Common Causes
40%
Failed coil-on-plug ignition coil B with internal winding failure or cracked epoxy housing allowing moisture intrusion
25%
Damaged or corroded wiring in the coil B trigger circuit, often from heat exposure near the exhaust manifold
20%
Worn or carbon-tracked spark plug causing secondary circuit overload and coil driver fault detection
15%
ECM internal coil driver transistor failure for the cylinder 2 ignition output
Diagnostic Steps
1
Swap ignition coil B with a known-good coil from another cylinder and clear codes. If the code follows the original coil to its new position, replace the coil. If P0352 remains, the fault is in the wiring or ECM driver.
2
Measure coil B primary winding resistance (spec: 0.4-1.0 ohms) and secondary winding resistance (spec: 6,000-12,000 ohms) with a digital multimeter. Compare readings to coil specifications.
3
Inspect the coil B connector for heat damage, melted plastic, or corroded terminals. Check for spark plug tube seal oil leaks that could contaminate the coil boot and connector.
4
Verify ECM coil driver output for cylinder 2 by backprobing the trigger wire and monitoring with a labscope during cranking. A proper signal shows consistent dwell pulses at approximately 2-4 ms duration.
5
Remove and inspect the cylinder 2 spark plug. Replace if electrode gap exceeds 0.055", insulator is cracked, or heavy carbon/oil deposits are present.
Estimated Repair Cost
$60 - $300
Parts + labor, varies by vehicle and location
The ECM has detected a malfunction in the primary or secondary circuit of ignition coil B, which typically serves cylinder #2. The ECM monitors the coil driver circuit for proper current flow and feedback, and has determined that coil B is not operating within expected parameters. This will cause a ...
The most common cause of P0352 (Ignition Coil B Primary/Secondary Circuit Malfunction) is: Failed coil-on-plug ignition coil B with internal winding failure or cracked epoxy housing allowing moisture intrusion
Typical repair costs for P0352 range from $60 to $300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Continuous misfire on cylinder 2 reduces available engine power and causes rough running. Extended operation dumps unburned fuel into the exhaust, risking catalytic converter overheat and potential fire hazard.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0352 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
