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DTC codes / P23xx · Ignition system and misfire / P230B

P230BCylinder 2 Air-Fuel Ratio Imbalance Adjustment At Limit During Balance

P230B indicates that the engine control module (ECM) has detected an air-fuel ratio imbalance on cylinder 2 that has reached the limit of its adaptive correction during a balance test. In plain terms, the computer tried to equalize cylinder 2's power contribution by adjusting fuel delivery, but the adjustment hit its maximum allowed value, meaning the cylinder is running significantly richer or leaner than the others.

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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