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DTC codes / P27xx · Transmission / P276C
P276C indicates that the transmission control module (TCM) has detected an abnormally high voltage on the supply circuit for the electric or auxiliary transmission fluid pump B motor. This pump is used in many modern automatic transmissions to maintain fluid pressure when the engine is stopped, such as during idle-stop or hybrid operation. The TCM monitors the voltage on the pump motor's power feed and sets this code when the signal exceeds the expected range, typically indicating a short to voltage or a faulty pump motor.
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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