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DTC codes / P23xx · Ignition system and misfire / P231A

P231ACylinder 7 Air-Fuel Ratio Imbalance Adjustment At Limit During Balance

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.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
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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