BMW DTC P277D – Electric/Auxiliary Transmission Fluid Pump ‘B’ Motor Over Temperature
DTC P277D meaning on BMW
DTC P277D on a BMW refers to the Electric/Auxiliary Transmission Fluid Pump ‘B’ Motor Over Temperature fault. This diagnostic trouble code indicates that the motor of the auxiliary transmission fluid pump ‘B’ has exceeded the specified temperature threshold.
BMW DTC P277D symptoms
Symptoms of BMW DTC P277D may include:
- Transmission shifting issues
- Reduced performance or power loss
- Transmission warning light illuminated on the dashboard
BMW DTC P277D causes
Common causes of BMW DTC P277D include:
- Overheating of the auxiliary transmission fluid pump ‘B’ motor
- Electrical faults in the transmission fluid pump circuit
- Defective transmission fluid pump ‘B’ motor
BMW DTC P277D seriousness
Ignoring BMW DTC P277D can lead to potential transmission damage and further drivability issues. It is recommended to address this fault promptly to prevent more severe problems.
How to diagnose DTC P277D on BMW
To diagnose BMW DTC P277D, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault code
- Inspect the auxiliary transmission fluid pump ‘B’ motor for overheating
- Check the electrical connections and wiring related to the transmission fluid pump
How to fix DTC P277D on BMW
To fix BMW DTC P277D, the following steps may be taken:
- Replace the auxiliary transmission fluid pump ‘B’ motor if it is found to be faulty
- Repair any damaged wiring or connectors in the transmission fluid pump circuit
- Ensure proper cooling and ventilation for the transmission fluid pump ‘B’ motor
How to erase DTC P277D on BMW
To erase BMW DTC P277D, a mechanic can use a diagnostic scanner to clear the fault code after the underlying issue has been resolved. Once the fault is fixed, the code can be cleared, and the transmission system can be rechecked for any recurring faults.
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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