Single Cylinder Misfire (Cylinder not Specified)
One cylinder in your engine is misfiring (not firing properly), but the system can't pinpoint which one. It's like one person in a group clapping out of rhythm, but you can't tell who.
The ECU monitors crankshaft speed variations between cylinder firings using the crankshaft position sensor. When one cylinder misfires, it creates an irregular pattern in crankshaft acceleration. The ECM detects this deviation from the expected combustion event signature.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Crankshaft Speed Variation | Consistent acceleration between firings | Deviation exceeds 15-25% threshold indicating misfire |
| Misfire Count Rate | Less than 1 misfire per 1000 revolutions | Sustained misfire detection over multiple cycles |
Code P0314 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, P0314 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.