U0104 – BMW DTC

BMW DTC U0104 – Lost Communication With Cruise Control Module

DTC U0104 meaning on BMW

DTC U0104 on a BMW indicates a communication error between the vehicle’s engine control module (ECM) and the cruise control module. This error code is specifically related to the cruise control system, signaling that the ECM has lost communication with the cruise control module.

BMW DTC U0104 symptoms

Symptoms of DTC U0104 on a BMW may include:

• Malfunctioning cruise control system
• Cruise control not engaging or disengaging properly
• Loss of cruise control functionality
• Check Engine Light (CEL) illuminated on the dashboard

BMW DTC U0104 causes

The common causes of DTC U0104 on a BMW are:

• Faulty cruise control module
• Wiring issues or loose connections between the ECM and cruise control module
• Defective ECM
• Software glitches or communication errors

BMW DTC U0104 seriousness

While DTC U0104 may not directly affect the drivability of the vehicle, it can lead to the loss of cruise control functionality, which can impact the convenience and comfort of driving. It is recommended to address this issue to ensure all vehicle systems are functioning properly.

How to diagnose DTC U0104 on BMW

To diagnose DTC U0104 on a BMW, follow these steps:

1. Use a diagnostic scanner to retrieve the fault codes from the ECM.
2. Inspect the cruise control module and its wiring for any visible damage or loose connections.
3. Check for any software updates or reprogramming needed for the ECM and cruise control module.
4. Perform a communication test between the ECM and cruise control module to identify any communication errors.

How to fix DTC U0104 on BMW

To fix DTC U0104 on a BMW, you can:

1. Repair or replace any damaged wiring or connectors between the ECM and cruise control module.
2. Replace the faulty cruise control module if necessary.
3. Update the software of the ECM and cruise control module to the latest version.
4. Clear the fault codes using a diagnostic scanner after the repairs have been made.

How to erase DTC U0104 on BMW

To erase DTC U0104 on a BMW:

1. Connect a diagnostic scanner to the vehicle’s OBD-II port.
2. Access the scanner’s menu to clear the fault codes stored in the ECM.
3. Follow the on-screen instructions to erase the DTC U0104 code.
4. Once the code is cleared, perform a test drive to ensure 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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