P231C Cylinder 9 Air - Fuel Ratio Imbalance - Adjustment At Limit During Balance

Cylinder 9 Air - Fuel Ratio Imbalance - Adjustment At Limit During Balance. The control module detected a fault associated with the Cylinder 9 Air - Fuel Ratio Imbalance - Adjustment At Limit During Balance circuit or function; the stored code identifies the affected component rather than a single failure mode.

P231C is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry and, where the ECU needs it, corrects the checksum too. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.