BMW DTC P1B25 – Hybrid/EV Battery Pack Voltage Sense ‘H’ Circuit High
DTC P1B25 meaning on BMW
DTC P1B25 on a BMW indicates an issue with the Hybrid/EV Battery Pack Voltage Sense ‘H’ Circuit being too high. This fault code is specific to hybrid or electric vehicles and relates to the voltage sensing circuitry of the high-voltage battery pack.
BMW DTC P1B25 symptoms
Symptoms of DTC P1B25 on a BMW may include warning lights on the dashboard related to the hybrid or electric system, reduced electric driving range, or the vehicle going into a reduced power mode to protect the battery system.
BMW DTC P1B25 causes
The high voltage sense circuit high fault (P1B25) on a BMW can be caused by issues such as a faulty high-voltage battery pack, a malfunctioning voltage sensor, poor electrical connections, or wiring problems in the high-voltage system.
BMW DTC P1B25 seriousness
DTC P1B25 is a serious fault code on a BMW hybrid or electric vehicle as it directly relates to the high-voltage battery system. Ignoring this fault can lead to further damage to the battery pack or other components of the hybrid or electric system.
How to diagnose DTC P1B25 on BMW
To diagnose DTC P1B25 on a BMW, a diagnostic scan tool capable of reading hybrid or electric vehicle fault codes is required. The technician will need to inspect the high-voltage battery pack, check the voltage sensor, and test the wiring and connections in the high-voltage system for any faults.
How to fix DTC P1B25 on BMW
Fixing DTC P1B25 on a BMW may involve replacing the high-voltage battery pack if it is found to be faulty, repairing or replacing the voltage sensor, ensuring all electrical connections are secure and free of corrosion, and addressing any wiring issues in the high-voltage system.
How to erase DTC P1B25 on BMW
Once the underlying issue causing DTC P1B25 on a BMW has been diagnosed and fixed, the fault code can be cleared using a diagnostic scan tool capable of clearing fault codes. This will reset the system and turn off the warning lights on the dashboard.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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