P0314
Single Cylinder Misfire — Cylinder Not Specified
A persistent misfire is detected on one cylinder, but the engine controller cannot identify which cylinder is affected. Often seen on engines without per-cylinder feedback or when crank position correlation fails.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on or flashing
- Rough idle and uneven running
- Power loss, hesitation under acceleration
- Increased fuel consumption
- Possible smell of unburned fuel from exhaust
Common causes
Ordered by how often each turns out to be the cause.
- Weak ignition component on one cylinderCommon
- Injector partially cloggedPossible
- Low compression on one cylinderLess likely
Parts involved
- Ignition Coil
- Injector
- Spark Plug
- ECM
P0314 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.