DTC codes / P27xx · Transmission / P277A
P277A indicates that the transmission control module has detected a hydraulic leakage condition in the electric or auxiliary transmission fluid pump circuit B. The computer monitors pump performance and pressure; when the pump cannot maintain the expected pressure or flow due to an internal or external leak, it sets this code.
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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