BMW DTC P277C – Electric/Auxiliary Transmission Fluid Pump ‘B’ Motor Stalled
DTC P277C meaning on BMW
DTC P277C on a BMW indicates an issue with the Electric/Auxiliary Transmission Fluid Pump ‘B’ motor stalling. This fault code is specific to the transmission system and points towards a malfunction in the auxiliary pump motor.
BMW DTC P277C symptoms
Symptoms of DTC P277C on a BMW may include harsh shifting, delayed engagement of gears, transmission slipping, and in some cases, the transmission may go into a fail-safe mode. The Check Engine Light may also illuminate on the dashboard.
BMW DTC P277C causes
The common causes of DTC P277C on a BMW include a faulty electric/auxiliary transmission fluid pump ‘B’ motor, wiring issues, low transmission fluid level, or a failed transmission control module.
BMW DTC P277C seriousness
DTC P277C should be addressed promptly as it can lead to further damage to the transmission system if left unresolved. Driving with this fault can cause erratic shifting and potential transmission failure.
How to diagnose DTC P277C on BMW
To diagnose DTC P277C on a BMW, a diagnostic scan tool capable of reading transmission fault codes is required. The technician will need to inspect the electric/auxiliary transmission fluid pump ‘B’ motor, check the wiring harness for any damage, and ensure the transmission fluid level is correct.
How to fix DTC P277C on BMW
Fixing DTC P277C on a BMW may involve replacing the electric/auxiliary transmission fluid pump ‘B’ motor, repairing any damaged wiring, topping up the transmission fluid, or replacing the transmission control module if necessary. It is recommended to follow the manufacturer’s repair procedures.
How to erase DTC P277C on BMW
After fixing the underlying issue causing DTC P277C on a BMW, the fault code can be erased using a diagnostic scan tool. The technician can clear the code and reset the Check Engine Light to ensure 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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