Ignition Coil A Primary/Secondary Circuit Malfunction
The engine computer is seeing a problem in the ignition coil circuit for cylinder 1. This can stop that cylinder from firing correctly and can cause rough running, misfires, and poor fuel economy.
You may be able to drive short distances, but the engine can run rough and may lose power. Continued driving can damage the catalytic converter and worsen the problem.
P0351 sets when the PCM detects an electrical fault in the ignition coil A circuit, usually the coil serving cylinder 1 on many vehicles. The fault may be on the coil primary control side, the secondary output side, or the wiring/connectors between the PCM and the coil. The code often appears with a misfire code if the coil is not firing correctly.
It usually means the ignition coil circuit for cylinder 1 has an electrical fault or the coil is not firing correctly.
Yes. A worn or fouled spark plug can overload the coil or cause misfire symptoms that lead to this code.
No. Wiring, connectors, spark plugs, and the PCM control circuit can also cause this code.
Yes. It can cause misfires, power loss, and catalytic converter damage if driven too long.