U1104 – BMW DTC

BMW DTC U1104 – Message Monitoring Actuation Cruise Control/ACC Check Sum Error

DTC U1104 meaning on BMW

The DTC U1104 code on a BMW refers to a Message Monitoring Actuation Cruise Control/ACC Check Sum Error. This error code indicates a problem with the communication system related to the cruise control or adaptive cruise control (ACC) system in the vehicle.

BMW DTC U1104 symptoms

Symptoms of the DTC U1104 code on a BMW may include:

• Malfunction or inoperable cruise control system
• ACC system not functioning properly
• Warning light illuminated on the dashboard

BMW DTC U1104 causes

Common causes of the DTC U1104 code on a BMW include:

• Faulty cruise control module
• Communication error between control modules
• Wiring or connection issues

BMW DTC U1104 seriousness

The DTC U1104 code is not typically considered a serious issue in terms of safety, but it can affect the convenience and functionality of the cruise control system in the vehicle. It is recommended to address this issue to ensure proper operation of the cruise control and ACC systems.

How to diagnose DTC U1104 on BMW

To diagnose the DTC U1104 code on a BMW, a mechanic may perform the following steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s computer
2. Inspect the cruise control module and related components for any visible damage or loose connections
3. Check the wiring harness for any signs of wear or corrosion
4. Perform a communication system test to identify any issues between control modules

How to fix DTC U1104 on BMW

To fix the DTC U1104 code on a BMW, the following steps may be taken:

1. Repair or replace any damaged wiring or connections in the cruise control system
2. Replace the cruise control module if it is found to be faulty
3. Clear the fault codes using a diagnostic scanner after the repairs have been made
4. Test drive the vehicle to ensure the cruise control and ACC systems are functioning properly

How to erase DTC U1104 on BMW

To erase the DTC U1104 code on a BMW, follow these steps:

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 vehicle’s computer
3. Follow the on-screen prompts to erase the DTC U1104 code
4. Once the code has been cleared, disconnect the scanner and start the vehicle to ensure the warning light is no longer illuminated

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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