U189B – BMW DTC

BMW DTC U189B – Drive Motor ‘A’ Control Module Lost Communication With TCM

DTC U189B meaning on BMW

DTC U189B on a BMW indicates that the Drive Motor ‘A’ 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 U189B symptoms

Symptoms of DTC U189B on a BMW may include:

• Check Engine Light (CEL) illuminated
• Transmission shifting issues
• Reduced engine performance
• Vehicle may go into limp mode

BMW DTC U189B causes

Common causes of DTC U189B on a BMW include:

• Faulty Drive Motor ‘A’ Control Module
• Faulty Transmission Control Module (TCM)
• Wiring or connection issues between modules
• Software glitches

BMW DTC U189B seriousness

DTC U189B should not be ignored as it can lead to drivability issues and potential safety concerns. It is recommended to address this fault promptly to ensure the proper functioning of the vehicle.

How to diagnose DTC U189B on BMW

To diagnose DTC U189B on a BMW, a diagnostic scan tool capable of reading manufacturer-specific codes is required. The following steps can be taken:

1. Retrieve the fault codes using a diagnostic scan tool
2. Check for any related symptoms or issues
3. Inspect the wiring and connections between the Drive Motor ‘A’ Control Module and TCM
4. Perform a module communication test to identify the source of the communication error

How to fix DTC U189B on BMW

To fix DTC U189B on a BMW, the following steps can be taken:

1. Address any underlying issues such as faulty modules or wiring problems
2. Repair or replace the Drive Motor ‘A’ Control Module or TCM if necessary
3. Clear the fault codes using a diagnostic scan tool
4. Perform a test drive to ensure the issue has been resolved

How to erase DTC U189B on BMW

To erase DTC U189B on a BMW, follow these steps:

1. Connect a diagnostic scan tool to the vehicle’s OBD-II port
2. Select the option to clear fault codes or reset the system
3. Follow the on-screen prompts to erase the DTC U189B code
4. Verify that the code has been successfully cleared

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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