Diagnostic Trouble Code (DTC) Information

ECM-P030000 Random Misfire Registered

Condition
The engine control module (ECM) checks engine combustion regarding misfire by registering speed deviations in flywheel rotation. If a certain number of misfires are detected for several cylinders during a certain number of crankshaft rotations, the misfires are considered emission-related or capable of damaging the catalytic converter and the diagnostic trouble code is generated.

The diagnostic trouble code can be diagnosed when the engine is running.

Substitute Value
- Nothing.

Possible Source
- Damaged spark plug.
- Clogged/leaking injector.
- Uneven compression.
- Air leakage.
- Faulty fuel pressure.
- Low fuel level.
- Contaminated or wrong fuel.
- Repeated cold starts where the engine temperature does not reach proper operating temperature between starts.
- Wrong fuel grade (summer fuel in the winter, certain markets).

Fault Symptom[s]
- Malfunction indicator lamp (MIL) lit.
- Malfunction indicator lamp (MIL) flashes.
- Engine misfire.
- Engine reluctant to start.
- Poor performance.
- Uneven idle.
- The engine does not run on all cylinders.
- Message in the display.