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DTC codes / P27xx · Transmission / P27E1
P27E1 indicates that the transmission control module (TCM) has detected insufficient hydraulic pressure from the electric auxiliary transmission fluid pump, often called the auxiliary pump or 'A' pump. The TCM monitors a pressure sensor in the auxiliary pump circuit and sets this code when the measured pressure falls below the expected threshold for the commanded pump operation.
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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