BMW DTC U189C – Drive Motor ‘B’ Control Module Lost Communication With TCM
DTC U189C meaning on BMW
The DTC U189C code on a BMW indicates that the Drive Motor ‘B’ Control Module has lost communication with the Transmission Control Module (TCM). This communication error can disrupt the proper functioning of the vehicle’s drivetrain system.
BMW DTC U189C symptoms
Symptoms of the BMW DTC U189C code may include:
- Check Engine Light (MIL) illuminated
- Transmission shifting issues
- Reduced engine performance
- Vehicle may go into limp mode
BMW DTC U189C causes
Common causes of the BMW DTC U189C code include:
- Faulty Drive Motor ‘B’ Control Module
- Faulty Transmission Control Module (TCM)
- Wiring or connection issues between modules
- Software glitches
BMW DTC U189C seriousness
The DTC U189C code should be addressed promptly as it can lead to drivability issues and potential safety concerns. Ignoring this code may result in further damage to the vehicle’s drivetrain components.
How to diagnose DTC U189C on BMW
To diagnose the DTC U189C code on a BMW, you can perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s computer.
- Inspect the wiring and connections between the Drive Motor ‘B’ Control Module and the Transmission Control Module.
- Check for any visible signs of damage or corrosion on the modules.
- Perform a communication test between the modules to verify the connection.
How to fix DTC U189C on BMW
To fix the DTC U189C code on a BMW, you can try the following solutions:
- Repair or replace any damaged wiring or connectors between the modules.
- If the modules are faulty, they may need to be replaced.
- Update the software in the modules to the latest version.
- Clear the fault codes and perform a test drive to ensure the issue is resolved.
How to erase DTC U189C on BMW
To erase the DTC U189C code on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the vehicle’s computer. After clearing the codes, perform a test drive to confirm that the issue has been resolved.
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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