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DTC codes / P28xx · Transmission / P285C
P285C indicates that the transmission control module (TCM) has detected a performance problem with the actuator that controls shift fork A, which is responsible for engaging and disengaging a gear in an automated manual or dual-clutch transmission. The TCM monitors the actuator's electrical current, position feedback, and response time, and it sets this code when the actuator fails to move the fork as commanded within the expected time or range.
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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