P0352 — Ignition Coil B Primary/Secondary Circuit
High severityWhat it means
P0352 is stored when the engine control unit sees a fault involving coil B's primary/secondary circuit. Ignition coils step battery voltage up to the tens of thousands of volts needed to fire the spark plugs, so a circuit fault causes a misfire on the affected cylinder. The control unit has flagged this circuit or signal as outside its normal operating range.
Common symptoms
- Misfire, rough idle and shaking
- Hesitation and power loss
- Flashing or steady check engine light
Likely causes
- A wiring, connector or ground problem in the circuit
- A failed sensor or actuator in the circuit
- Failed coil B
- Coil driver, wiring or connector fault
What to check first
- Inspect the connector and wiring for damage, corrosion or loose pins
- Swap coil B with a neighbouring cylinder and see if the fault follows
- Inspect the coil connector and primary wiring
Can you keep driving?
A coil fault means an active misfire that can damage the catalytic converter; limit driving and stop if the light flashes.
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All information, explanations and guidance on this page are general preliminary information only. They are estimates and may be entirely wrong, incomplete or inaccurate, or may not apply to your vehicle at all. Never take any action based on this content alone — do not decide to keep driving, clear codes, replace parts, repair or otherwise work on your vehicle based only on what you read here. In every case, and for any final decision, you must consult qualified technical personnel (a professional mechanic, an authorized service centre or an engineer) and obtain their approval before acting. MechanicAI accepts no liability or responsibility whatsoever for any damage, fault, injury, loss or outcome that may arise — directly or indirectly — from using or relying on this information, for any reason and under any circumstances. By using this page you acknowledge and accept these terms.