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DTC codes / P27xx · Transmission / P2728
P2728 indicates that the transmission control module (TCM) has detected an out-of-range or performance fault in the electrical circuit for pressure control solenoid 'E', which is used to regulate hydraulic pressure inside the automatic transmission. The computer compares expected solenoid behavior against actual feedback and sets this code when the signal falls outside the acceptable range or fails a rationality check.
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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