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DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P25FF
P25FF indicates that the electrical system voltage stabilizer control module has failed its internal performance self-test or is not maintaining the stable output voltage the powertrain control module expects. The computer monitors the stabilizer's control circuit and output, and it sets this code when the voltage regulation deviates from the commanded value or the module's feedback signal is implausible.
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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