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.
Affected components
- Ignition coil
- Injector
- Spark plug
- Ecm
Common causes
- High likelihood: Weak ignition component on one cylinder
- Medium likelihood: Injector partially clogged
- Low likelihood: Low compression on one cylinder
Possible 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
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.