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DTC codes / P23xx · Ignition system and misfire / P231E

P231ECylinder 11 Air-Fuel Ratio Imbalance Adjustment At Limit During Balance

P231E indicates that the engine control module has reached the limit of its ability to balance the air-fuel ratio on cylinder 11 during a fuel trim balance test. The computer is detecting that the fuel injector for cylinder 11 requires an adjustment beyond the allowed range to maintain even power contribution across all cylinders.

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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