BMW DTC U126D – Lost Communication With Drive Motor ‘A’ Coolant Pump
DTC U126D meaning on BMW
The DTC U126D on a BMW indicates a communication error with the Drive Motor ‘A’ Coolant Pump. This fault code is specific to the hybrid or electric vehicles that have a drive motor coolant pump system.
BMW DTC U126D symptoms
Symptoms of the DTC U126D on a BMW may include:
- Check Engine Light (CEL) illuminated
- Hybrid or electric drive system may not operate optimally
- Loss of power or reduced performance
BMW DTC U126D causes
Common causes of the DTC U126D on a BMW include:
- Faulty drive motor coolant pump
- Wiring or connection issues
- Communication bus malfunctions
BMW DTC U126D seriousness
The DTC U126D should be addressed promptly as it can affect the performance and efficiency of the hybrid or electric drive system in the BMW. Ignoring this fault code may lead to further complications and potential drivability issues.
How to diagnose DTC U126D on BMW
To diagnose the DTC U126D 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 drive motor coolant pump for any visible damage or malfunctions
- Check the wiring and connections associated with the drive motor coolant pump
- Test the communication bus for any faults
How to fix DTC U126D on BMW
To fix the DTC U126D on a BMW, the following steps may be taken:
- Replace the faulty drive motor coolant pump if necessary
- Repair any damaged wiring or connections
- Address any communication bus issues
- Clear the fault code and perform a test drive to ensure the issue is resolved
How to erase DTC U126D on BMW
To erase the DTC U126D on a BMW, a diagnostic scanner can be used to clear the fault code from the vehicle’s system. After fixing 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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