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DTC codes / P27xx · Transmission / P27A2
P27A2 indicates that the transmission control module (TCM) has detected an open circuit or control fault in the electrical path for the auxiliary transmission fluid pump 'B' circuit. This pump is often used in stop-start systems or hybrid vehicles to maintain fluid pressure when the engine is off, and the TCM monitors the circuit for expected voltage or current; an open circuit means the pump cannot be commanded on.
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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