Ignition Coil C Primary/Secondary Circuit
The Powertrain Control Module (PCM) detected a malfunction in the primary or secondary electrical circuit of ignition coil 'C', which typically corresponds to engine cylinder number 3. This code is set when the PCM does not receive the expected voltage pulse signal from the ignition coil circuit, indicating a failure to properly fire the spark plug.
A malfunctioning ignition coil causes an engine misfire, which can lead to severe catalytic converter damage if driven for extended periods. It is highly recommended to diagnose and repair this issue immediately.
Common symptoms
- Illuminated or flashing Check Engine Light
- Engine misfire resulting in a rough idle
- Noticeable lack of engine power during acceleration
- Engine hesitation, stumbling, or surging
- Decreased fuel economy and strong exhaust odor
Likely causes
- Faulty ignition coil C (cylinder 3)
- Damaged, loose, or corroded wiring and connector at ignition coil C
- Faulty or heavily fouled spark plug in cylinder 3
- Open or shorted ignition coil control circuit wiring
- Faulty Powertrain Control Module (PCM) or ignition coil driver (rare)
What to check before replacing parts
Inspect the wiring and connector at ignition coil C (cylinder 3).
Look for: Look for loose connections, broken wires, melted insulation, or corrosion in the connector pins that could interrupt the circuit.
Swap ignition coil C with another cylinder's coil (e.g., cylinder 1) and clear the codes.
Look for: If the code moves to the new cylinder (e.g., P0351), the ignition coil is faulty. If the code remains P0353, the issue is in the wiring, spark plug, or PCM.
Remove and inspect the spark plug for cylinder 3.
Look for: Check for a cracked insulator, worn electrodes, or heavy carbon/oil fouling that could cause excessive resistance in the secondary circuit.
Test the ignition coil C power and ground circuits using a digital multimeter.
Look for: With the ignition on, verify there is battery voltage at the power wire and a solid ground. Lack of voltage indicates a wiring, relay, or fuse issue.
Check the trigger signal from the PCM to the ignition coil using an oscilloscope or noid light.
Look for: A consistent pulsing signal while cranking or running indicates the PCM and wiring are good. No pulse suggests a broken trigger wire or a failed PCM driver.
This page explains the generic P0353 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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