U0291 – BMW DTC

BMW DTC U0291 – Lost Communication With Gear Shift Control Module ‘B’

DTC U0291 meaning on BMW

The DTC U0291 code on a BMW indicates a communication error between the vehicle’s engine control module (ECM) and the gear shift control module ‘B’. This error means that the ECM is unable to receive or transmit data with the gear shift control module ‘B’, leading to potential issues with the transmission system.

BMW DTC U0291 symptoms

Symptoms of the DTC U0291 code on a BMW may include:

• Transmission shifting problems
• Vehicle stuck in a particular gear
• Check Engine Light (CEL) illuminated on the dashboard
• Reduced vehicle performance

BMW DTC U0291 causes

The DTC U0291 code on a BMW can be caused by various factors, including:

• Faulty gear shift control module ‘B’
• Wiring or connection issues between the ECM and gear shift control module ‘B’
• Software glitches in the ECM or gear shift control module ‘B’
• Low battery voltage affecting communication

BMW DTC U0291 seriousness

The DTC U0291 code should be addressed promptly as it can lead to transmission-related problems and affect the overall drivability of the vehicle. Ignoring this code may result in further damage to the transmission system and potentially compromise vehicle safety.

How to diagnose DTC U0291 on BMW

To diagnose the DTC U0291 code on a BMW, a mechanic can perform the following steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s ECM
2. Inspect the wiring and connections between the ECM and gear shift control module ‘B’ for any damage or corrosion
3. Check the battery voltage and ensure it is within the specified range
4. Perform a communication test between the ECM and gear shift control module ‘B’ using a scan tool

How to fix DTC U0291 on BMW

To fix the DTC U0291 code on a BMW, the following steps can be taken:

1. Repair or replace any damaged wiring or connections between the ECM and gear shift control module ‘B’
2. Update the software in the ECM and gear shift control module ‘B’ to the latest version
3. Replace the gear shift control module ‘B’ if it is found to be faulty
4. Clear the fault codes using a diagnostic scanner after the repairs have been completed

How to erase DTC U0291 on BMW

To erase the DTC U0291 code on a BMW, follow these steps:

1. Connect a diagnostic scanner to the vehicle’s OBD-II port
2. Select the option to erase fault codes from the ECM
3. Follow the on-screen prompts to clear the DTC U0291 code
4. Ensure that the issue causing the code has been resolved before clearing it

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

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.