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DTC codes / P23xx · Ignition system and misfire / P230C

P230CCylinder 3 Air-Fuel Ratio Imbalance Adjustment At Limit During Balance

P230C indicates that the powertrain control module (PCM) has detected an air-fuel ratio imbalance on cylinder 3 that is severe enough to reach the adjustment limit during a balance test. The PCM monitors crankshaft speed variations to identify a weak or rich cylinder, and when the fuel trim correction for cylinder 3 can no longer compensate, it sets this code.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaIgnition system and misfire

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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