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DTC codes / P27xx · Transmission / P27DF
P27DF indicates that the transmission control module (TCM) has detected an abnormally low voltage or current on the control circuit for pressure control solenoid T. This solenoid is responsible for regulating hydraulic pressure inside the transmission, and a low circuit condition means the TCM cannot reliably command the solenoid, potentially leading to harsh or erratic shifting.
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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