BMW DTC P1B99 – Hybrid/EV Battery Module ‘B’ Circuit High
DTC P1B99 meaning on BMW
DTC P1B99 on a BMW indicates a fault with the Hybrid/EV Battery Module ‘B’ Circuit High. This means that there is a high voltage condition detected in the ‘B’ module of the hybrid or electric vehicle battery system.
BMW DTC P1B99 symptoms
Symptoms of DTC P1B99 on a BMW may include warning lights on the dashboard related to the hybrid or electric system, reduced hybrid or electric drive performance, and potential issues with charging the battery.
BMW DTC P1B99 causes
The high voltage condition in the Hybrid/EV Battery Module ‘B’ Circuit can be caused by various factors such as a faulty battery module, damaged wiring or connectors, software issues, or problems with the battery management system.
BMW DTC P1B99 seriousness
DTC P1B99 should be taken seriously as it can affect the performance and safety of the hybrid or electric vehicle. Driving with this fault can lead to further damage to the battery system and other components.
How to diagnose DTC P1B99 on BMW
To diagnose DTC P1B99 on a BMW, a diagnostic scan tool capable of reading hybrid or electric vehicle codes is needed. The technician will inspect the battery modules, wiring, and connectors for any visible damage. Further testing may be required to pinpoint the exact cause of the high voltage condition.
How to fix DTC P1B99 on BMW
Fixing DTC P1B99 on a BMW may involve replacing the faulty battery module, repairing damaged wiring or connectors, updating software, or recalibrating the battery management system. It is recommended to have the repair done by a qualified technician familiar with hybrid or electric vehicle systems.
How to erase DTC P1B99 on BMW
After the issue causing DTC P1B99 has been fixed, the diagnostic trouble code can be erased using a diagnostic scan tool. The technician will clear the code from the vehicle’s memory, and the warning lights should disappear if the repair was successful.
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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