BMW DTC P1BB4 – Hybrid/EV Battery Module ‘B’ Over Temperature
DTC P1BB4 meaning on BMW
DTC P1BB4 on a BMW indicates that there is an issue with the Hybrid/EV Battery Module ‘B’ being over temperature. This fault code specifically points to a problem related to the temperature of the battery module ‘B’ in the hybrid or electric vehicle system.
BMW DTC P1BB4 symptoms
Symptoms of the DTC P1BB4 on a BMW may include warning lights on the dashboard related to the hybrid or electric system, reduced performance or efficiency of the vehicle, and in some cases, the vehicle may go into a reduced power mode to prevent further damage.
BMW DTC P1BB4 causes
The most common causes of the DTC P1BB4 on a BMW are high ambient temperatures, prolonged stress on the battery module ‘B’, a malfunction in the battery cooling system, or a fault in the battery temperature sensors.
BMW DTC P1BB4 seriousness
The DTC P1BB4 is a serious fault code as it indicates that the battery module ‘B’ in the hybrid or electric system is experiencing over temperature conditions. Continuing to drive the vehicle with this fault unresolved can lead to further damage to the battery system and potentially pose a safety risk.
How to diagnose DTC P1BB4 on BMW
To diagnose the DTC P1BB4 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 battery module ‘B’, check the battery temperature sensors, and verify the operation of the cooling system to pinpoint the exact cause of the over temperature condition.
How to fix DTC P1BB4 on BMW
Fixing the DTC P1BB4 on a BMW may involve replacing faulty temperature sensors, repairing the cooling system, or addressing any issues causing the battery module ‘B’ to overheat. It is recommended to have this repair performed by a qualified automotive technician with experience in hybrid or electric vehicle systems.
How to erase DTC P1BB4 on BMW
Once the underlying issue causing the DTC P1BB4 on a BMW has been resolved, the fault code can be cleared using a diagnostic scan tool. The technician can clear the code, and if the repair was successful, the warning lights related to the fault should no longer be illuminated 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
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.