Cylinder 11 Contribution/Balance Fault
Your engine's cylinder 11 isn't pulling its weight compared to the others, like one member of a team doing less work. The ECU detected an imbalance in how much that cylinder is contributing to combustion.
The ECU monitors combustion efficiency and cylinder contribution through fuel trim, ignition timing, and misfire detection sensors. It compares cylinder 11's performance against baseline and other cylinders to detect combustion imbalances. When contribution falls outside acceptable range, the fault sets.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Cylinder 11 Contribution Rate | Within 5% of average cylinder output | Exceeds ±10% deviation from baseline |
| Combustion Efficiency Index | Above 95% for cylinder 11 | Below 85% efficiency threshold |
Code P0294 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, P0294 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.