P0351
Ignition Coil "A" Primary/Secondary Circuit Malfunction (Cylinder 1)
An electrical fault is detected in both the primary and the secondary circuit of ignition coil A (cylinder 1). The ECU cannot drive the coil correctly, so the cylinder served by coil A misfires or does not fire at all. Causes: an open or shorted primary control wire, an internal coil winding fault, a failed igniter/driver, or wiring or connector damage at the coil.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Coil primary winding open or shortedCommon
- Wiring or connector faultPossible
Parts involved
- Ignition Coil
- Ignition Coil Wiring
- ECU Ignition Driver
P0351 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.