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DTC codes / P23xx · Ignition system and misfire / P23A8
P23A8 indicates that the powertrain control module (PCM) has detected a performance problem with the position sensor stop for the exhaust heat exchanger bypass valve B. The sensor's signal does not correlate with expected values during self-tests or commanded movements, suggesting the sensor's mechanical stop is misadjusted, damaged, or the sensor itself has failed.
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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