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DTC codes / P28xx · Transmission / P28F5
P28F5 indicates that the powertrain control module has detected an intermittent or erratic signal from the engine disconnect clutch pressure sensor circuit, meaning the voltage or pressure reading jumps around or drops out unpredictably rather than failing completely. This sensor monitors hydraulic pressure in the clutch that connects and disconnects the engine from the transmission in hybrid and automatic-stop-start systems, and the module cannot trust the signal to manage clutch engagement smoothly.
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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