U115B – BMW DTC

BMW DTC U115B – Lost Communication With Engine Control Torque 3

DTC U115B meaning on BMW

DTC U115B on a BMW indicates a communication error between the Engine Control Module (ECM) and the Torque Control Module 3. This error code signifies that the ECM is unable to receive or transmit data to the Torque Control Module 3, leading to a loss of communication between these vital components in the vehicle’s control system.

BMW DTC U115B symptoms

Symptoms of DTC U115B on a BMW may include:

• Check Engine Light (CEL) illuminated on the dashboard
• Reduced engine performance or power loss
• Transmission shifting issues
• Vehicle going into limp mode

BMW DTC U115B causes

The potential causes of DTC U115B on a BMW include:

• Faulty wiring or connectors between the ECM and Torque Control Module 3
• Defective ECM or Torque Control Module 3
• Interference from other electronic components
• Software issues within the control modules

BMW DTC U115B seriousness

DTC U115B should not be ignored as it can lead to drivability issues and potential safety concerns. Ignoring this communication error between critical control modules can result in further damage to the vehicle’s systems and components.

How to diagnose DTC U115B on BMW

To diagnose DTC U115B on a BMW, a mechanic would typically perform the following steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the ECM
2. Inspect the wiring and connectors between the ECM and Torque Control Module 3 for any damage or corrosion
3. Check for any loose connections or poor grounds
4. Perform a communication test between the ECM and Torque Control Module 3

How to fix DTC U115B on BMW

To fix DTC U115B on a BMW, the following steps may be taken:

1. Repair or replace any damaged wiring or connectors between the ECM and Torque Control Module 3
2. Ensure all connections are secure and free of corrosion
3. If necessary, replace the faulty ECM or Torque Control Module 3
4. Clear the fault codes and perform a test drive to verify the repair

How to erase DTC U115B on BMW

To erase DTC U115B on a BMW, follow these steps:

1. Use a diagnostic scanner to access the ECM and clear the fault codes
2. Perform a test drive to ensure the code does not return
3. If the code reappears, further diagnosis may be required to address the underlying issue

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.