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DTC codes / P23xx · Ignition system and misfire / P230D

P230DCylinder 4 Air-Fuel Ratio Imbalance Adjustment At Limit During Balance

P230D indicates that the powertrain control module (PCM) has detected an air-fuel ratio imbalance on cylinder 4 that has reached the adjustment limit during a balance test. The engine computer tried to equalize power contribution across all cylinders and found that cylinder 4 could not be corrected any further, meaning that cylinder is running significantly richer or leaner than the rest.

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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