Powertrain, generic · Ignition system or misfire
P0350 Ignition Coil Primary/Secondary Circuit/Open
Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible
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.
Likely causes
Ignition coil, coil pack or ignition module faulty
Shared supply (fuse, relay, ignition feed) or ground open
Harness, connector or feedback line to the coils faulty
Ignition lead or plug connector damaged (secondary side)
Engine module or driver
Symptoms
- Check engine light on
- Misfire, rough running
- Starting problems or stalling if a shared output stage fails
Repair estimate
DifficultyMediumDIY possible
Parts and labour€50–400
Time0.5–2 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
ignition coilsignition moduleignition wiring
Related codes
References: law.cornell.edu, newtonnet.co.uk.