P0350: Ignition Coil Primary/Secondary Circuit/Open

What does P0350 mean?

P0350 is the general ignition coil circuit code without assignment to a coil: the engine module detects a fault in the primary or secondary circuit of a coil but does not report which one. This typically concerns older systems with a shared output stage or ignition module, or a shared feedback line for all coils. The monitoring works as for P0351 ff – primary-current feedback for each ignition command, or the voltage at the driver. GM and Ford report coil faults individually (P0351 ff, P2300 ff) and do not use P0350; the description follows CARB's output monitoring requirement, which allows one collective code.

The code tells you which monitor failed, not which part is broken. Test before replacing parts.

Symptoms

• Check engine light on
• Misfire, rough running
• Starting problems or stalling if a shared output stage fails

Common causes

• High Ignition coil, coil pack or ignition module faulty
• Medium Shared supply (fuse, relay, ignition feed) or ground open
• Medium Harness, connector or feedback line to the coils faulty
• Low Ignition lead or plug connector damaged (secondary side)
• Low Engine module or driver

Likelihood is a general estimate across vehicles; your make and model may differ.