The control module detected that the signal in the Auxiliary Ignition Switch On/Start Position circuit stayed below the expected operating range.
TuningBot DTC Database · v4.37.15
P25B8 Auxiliary Ignition Switch On/Start Position Circuit Low
Generic (OBD-II) interpretation in the TuningBot DTC database.
What P25B8 means
Related and nearby codes
How to read P25B8
Powertrain: engine, transmission and driveline systems.
Generic SAE-standard code: same meaning on every make.
Specific fault index within the subsystem.
Frequently asked questions about P25B8
What does P25B8 mean?
Auxiliary Ignition Switch On/Start Position Circuit Low. The control module detected that the signal in the Auxiliary Ignition Switch On/Start Position circuit stayed below the expected operating range.
Is P25B8 generic or manufacturer-specific?
P25B8 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P25B8 at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
Other file services
Understand the system behind this code: Diagnostic Strategy and DTC Logic
