P0351 GMC Terrain
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 GMC Terrain 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 GMC Terrain.
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 GMC Terrain.
Common Causes on GMC Terrain
- Failed ignition coil on cylinder 1
- Wiring fault in the ignition coil driver circuit for cylinder 1
- Corroded coil connector or damaged coil boot
- PCM ignition driver circuit failure (rare)
Symptoms
- Check Engine Light on
- Cylinder 1 misfire (may also set P0301)
- Rough idle and vibration
- Loss of power
- Engine may run on fewer cylinders
Notes for GMC Terrain
GM coil-on-plug ignition coils are inexpensive — if one coil fails, consider replacing all coils and plugs as a set since they all have similar mileage.