What does code P0351 mean on a Hyundai and is it safe to drive?
P0351: Ignition Coil A Primary/Secondary Circuit Malfunction. Here's what it means on your Hyundai, 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 Hyundai
- 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 Hyundai, 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 Hyundai
Hyundai Theta-II P0351 is typically a failed coil-on-plug coil. Carbon buildup from GDI operation can foul the spark plug and accelerate coil failure—replace both coil and plug on cylinder 1 as a set.
Most commonly affected models