DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P254C
P254C indicates that the powertrain control module has detected a low-voltage condition on the circuit for the power take-off speed selector sensor or switch number one. This sensor or switch is responsible for reporting the selected PTO speed range to the controller, and a low signal typically means the circuit is shorted to ground, the switch is faulty, or the wiring has a problem.
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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