What does code P0351 mean on a Toyota and is it safe to drive?
P0351: Ignition Coil A Primary/Secondary Circuit Malfunction. Here's what it means on your Toyota, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
What this code means
The PCM detected a fault in the primary or secondary circuit of ignition coil A (cylinder 1 coil on most coil-on-plug systems). This will cause a misfire on the affected cylinder and can damage the catalytic converter if left unresolved.
Common causes for your Toyota
- Failed ignition coil
- Fouled or worn spark plug on that cylinder
- Damaged ignition coil wiring or connector
- Faulty PCM output driver (rare)
Symptoms
- Check Engine Light on, often flashing
- Rough idle and misfire
- Loss of power
- Poor fuel economy
Typical fixes
- Replace ignition coil for cylinder 1
- Replace spark plug on affected cylinder
- Inspect coil wiring and connector
Repair cost range
For a Toyota, repairs for P0351 often fall between $80 and $300, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Toyota
Toyota P0351 on coil-on-plug engines is usually a failed ignition coil for cylinder 1. Toyota coils are generally long-lived but fail individually; replace the single failed coil and the spark plug on the same cylinder.
Most commonly affected models