What P0351 means
The primary or secondary circuit of ignition coil 1 is out of specification.
Common causes
- Failed ignition coil
- Damaged coil connector or wiring
- Driver circuit fault in the ECU (rare)
How it is usually fixed
- 1Swap the coil to another cylinder to confirm
- 2Inspect the connector
- 3Replace the coil, and the plug with it
Other common codes
- P0011 — Camshaft Position A – Timing Over-Advanced (Bank 1)
- P0030 — HO2S Heater Control Circuit (Bank 1, Sensor 1)
- P0101 — Mass Air Flow Circuit Range/Performance
- P0113 — Intake Air Temperature Sensor Circuit High
- P0118 — Engine Coolant Temperature Sensor Circuit High
- P0131 — O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1)
Code information is general guidance, not a diagnosis for a specific vehicle. Confirm with live data and manufacturer test procedures before replacing parts.