What does code P25B7 mean?

Q: What does code P25B7 mean?

Auxiliary Ignition Switch On/Start Position Circuit. P25B7 indicates that the auxiliary ignition switch on/start position circuit has a fault, meaning the engine control module (ECM) or body control module (BCM) is not seeing the expected voltage signal from the auxiliary or start position of the ignition switch. The computer detects an abnormal condition, such as an open circuit, short to ground, or short to power, in the wiring or switch itself.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P25B7

P25B7Auxiliary Ignition Switch On/Start Position Circuit

P25B7 indicates that the auxiliary ignition switch on/start position circuit has a fault, meaning the engine control module (ECM) or body control module (BCM) is not seeing the expected voltage signal from the auxiliary or start position of the ignition switch. The computer detects an abnormal condition, such as an open circuit, short to ground, or short to power, in the wiring or switch itself.

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.