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DTC codes / P27xx · Transmission / P27E4
P27E4 indicates that the transmission control module (TCM) has detected an out-of-range or performance fault in the electrical circuit for the auxiliary transmission fluid pump control valve. This valve manages fluid flow for the auxiliary pump, which maintains hydraulic pressure when the engine is off or during auto start-stop events, and the TCM expects a specific current or voltage response that it is not seeing.
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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