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DTC codes / P27xx · Transmission / P277A

P277AElectric/Auxiliary Transmission Fluid Pump B Hydraulic Leakage

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.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
AreaTransmission

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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