P0350 means Ignition Coil Primary/Secondary Circuit. The computer has found a fault in an ignition coil circuit but has not tied it to a specific cylinder. It is a generic OBD-II code, so the definition is the same on any make, but the most likely cause varies by engine; confirm with a scan tool and the service information for your vehicle before buying parts.
What P0350 means
Most modern engines use coil-on-plug ignition, with one coil per cylinder (or per pair of cylinders) switched by a driver inside the engine computer. The computer monitors each coil circuit, and a fault there usually comes with a misfire on the matching cylinder, so coil and misfire codes are diagnosed together.
P0350 symptoms
- Misfire or rough running
- Check engine light, possibly flashing
- Hard starting
Common causes of P0350
- Failed ignition coil
- Coil power feed or fuse fault
- Wiring or connector damage
- Engine computer driver fault
How to diagnose P0350
- Check for cylinder-specific misfire and coil codes
- Check coil power and grounds
- Swap a suspect coil to another cylinder and see if the misfire follows
Can you drive with P0350?
Not if the check engine light is flashing; misfires can damage the catalytic converter.
P0350 tips
Swapping coils between cylinders is a quick way to confirm a failed coil: if the misfire moves, the coil is bad. Also check the fuse and power feed that supply all the coils, since a shared power or ground fault can affect several cylinders at once, and look for oil or water in the spark plug wells.
Will P0350 clear itself?
If the fault stops, the computer turns off the check engine light by itself after several drive cycles without seeing it again, and the code stays in memory as history for a while. Clearing P0350 with a scan tool after a repair is fine, but if the cause is still there the code returns, sometimes within one drive. Disconnecting the battery also clears codes on most vehicles, but it erases learned fuel trims and idle settings as well.
Related codes
| Code | Meaning |
|---|---|
| P0300 | Random/Multiple Cylinder Misfire Detected |
| P0351 | Ignition Coil A Primary/Secondary Circuit Malfunction |
| P0352 | Ignition Coil B Primary/Secondary Circuit Malfunction |
Guides that help
When it is more than a sensor
If a coil and plug swap does not move the misfire and a compression or leak-down test shows a burnt valve or failed head gasket, the decision becomes repair versus replacement; see engine replacement cost and compare engines by code on our engines page.
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