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DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P25FA

P25FATurbocharger/Supercharger Bypass Valve C Control Circuit High

P25FA indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the bypass valve of turbocharger or supercharger 'C'. The PCM expects the circuit to operate within a specific voltage range, and a high reading suggests a short to power, an open circuit, or a faulty valve, which can prevent proper boost control.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaVehicle speed, idle control and auxiliary inputs

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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