DTC codes / P23xx · Ignition system and misfire / P231A
P231A indicates that the powertrain control module (PCM) has detected an air-fuel ratio imbalance on cylinder 7 that has reached the adjustment limit during a balance test. The PCM monitors crankshaft speed fluctuations to identify a weak or rich cylinder, and when the fuel trim correction for cylinder 7 can no longer bring its contribution into balance, it stores this code.
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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