P0351 Honda Pilot
Ignition Coil A Primary/Secondary Circuit Malfunction · Powertrain Code · High · Repair: Easy
What is P0351?
The ignition coil for cylinder 1 has an electrical fault.
When the Honda Pilot triggers code P0351 (ignition coil a primary/secondary circuit malfunction), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Honda Pilot.
This repair is rated easy, meaning basic tools, no lift needed.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Honda Pilot.
Common Causes on Honda Pilot
- Failed ignition coil on cylinder 1
- Damaged coil-on-plug connector or wiring
- PCM ignition driver circuit failure (rare)
- Short circuit in coil primary winding
Symptoms
- Check Engine Light on
- Cylinder 1 misfire (may also set P0301)
- Rough idle and engine vibration
- Loss of power
- Possible no-start if multiple coils affected
Notes for Honda Pilot
Honda coil-on-plug boots can fill with oil from leaking valve cover gaskets — if oil is present in the spark plug wells, replace the valve cover gasket to prevent repeat failures.