Misfire Detected - Fueling Disabled
Your engine is misfiring (cylinders not firing properly), so the ECU shut off fuel delivery to prevent damage—like a safety valve stopping water flow when something's wrong. You need to fix the misfire source before the engine will run normally again.
The ECM monitors crankshaft speed variations and cylinder contribution using the crankshaft position sensor. When it detects inconsistent firing (misfire) across multiple cylinders beyond a threshold, it disables fuel injection as a protective measure to prevent catalyst damage and running damage.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Crankshaft acceleration variation | <3% variance between cylinders | >3-5% variance detected; fuel cut |
| Misfire count per 1000 revolutions | <10 misfires | >10 misfires; fueling disabled |
Code P0363 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0363 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.