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DTC codes / P23xx · Ignition system and misfire / P23A6

P23A6Exhaust Heat Exchanger Bypass Valve B Stuck Open

P23A6 indicates that the powertrain control module (PCM) has detected the exhaust heat exchanger bypass valve B is stuck open, meaning the valve is not closing when commanded. The PCM compares commanded valve position with feedback from the valve position sensor and sets this code when the actual position remains open beyond a calibrated threshold.

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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