BMW DTC P277B – Electric/Auxiliary Transmission Fluid Pump ‘B’ Driver Circuit Performance
DTC P277B meaning on BMW
DTC P277B indicates an issue with the Electric/Auxiliary Transmission Fluid Pump ‘B’ Driver Circuit Performance in a BMW vehicle. This fault code specifically points to a problem with the driver circuit responsible for controlling the auxiliary transmission fluid pump ‘B’.
BMW DTC P277B symptoms
Symptoms of DTC P277B in a BMW may include:
- Transmission shifting issues
- Harsh or delayed shifting
- Transmission overheating
- Reduced fuel efficiency
- Illuminated Check Engine Light
BMW DTC P277B causes
Common causes of DTC P277B in a BMW include:
- Defective electric/auxiliary transmission fluid pump ‘B’
- Wiring or connection issues in the driver circuit
- Faulty transmission control module
- Low transmission fluid level or poor quality fluid
BMW DTC P277B seriousness
Ignoring DTC P277B in a BMW can lead to further transmission damage and potential safety hazards. It is important to address this issue promptly to prevent more severe problems and costly repairs down the line.
How to diagnose DTC P277B on BMW
To diagnose DTC P277B on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and related data
- Inspect the electric/auxiliary transmission fluid pump ‘B’ and its wiring for any visible damage
- Check the transmission fluid level and quality
- Test the driver circuit for proper voltage and continuity
- Scan the transmission control module for any additional error codes
How to fix DTC P277B on BMW
To fix DTC P277B on a BMW, the following steps may be taken:
- Replace the electric/auxiliary transmission fluid pump ‘B’ if found to be faulty
- Repair any damaged wiring or connections in the driver circuit
- Ensure the transmission fluid level is correct and of the recommended quality
- If necessary, replace the transmission control module
- Clear the fault code and test drive the vehicle to confirm the issue has been resolved
How to erase DTC P277B on BMW
To erase DTC P277B on a BMW, a diagnostic scanner can be used to clear the fault code from the vehicle’s memory. After addressing the underlying issue causing the fault code, the code can be cleared to reset the Check Engine Light and 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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