DTC codes / P27xx · Transmission / P277D
P277D indicates that the transmission control module has detected an over-temperature condition in the electric or auxiliary transmission fluid pump motor, specifically the 'B' motor circuit. The computer monitors pump motor temperature through a sensor or inferred calculation and sets this code when the temperature exceeds a calibrated threshold, typically due to excessive load, cooling system faults, or electrical issues.
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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