DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P25C7
P25C7 means the powertrain control module (PCM) has detected an abnormally high voltage on the signal circuit of the brake booster temperature sensor, which is used to protect the brake booster from overheating. The PCM expects the sensor's signal voltage to stay within a calibrated range, and a sustained high reading tells it the circuit is open, shorted to voltage, or the sensor has failed.
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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