U1103 – BMW DTC

BMW DTC U1103 – Lost Communication With Actuation Cruise Control/ACC

DTC U1103 meaning on BMW

The DTC U1103 code on a BMW indicates a communication error between the vehicle’s control module and the actuation cruise control/adaptive cruise control system. This error typically means that the control module is unable to receive or send data to the cruise control system, leading to a loss of functionality.

BMW DTC U1103 symptoms

Symptoms of the DTC U1103 code on a BMW may include:

• Malfunctioning cruise control system
• Adaptive cruise control not working properly
• Warning lights on the dashboard
• Reduced fuel efficiency

BMW DTC U1103 causes

The DTC U1103 code on a BMW can be caused by various factors, including:

• Faulty wiring or connectors in the cruise control system
• Defective cruise control module
• Software issues in the control module
• Interference from other electronic components

BMW DTC U1103 seriousness

While the DTC U1103 code may not directly affect the drivability of the vehicle, it can lead to the loss of important features like cruise control and adaptive cruise control. Ignoring this issue can result in inconvenience and potential safety concerns, especially on long drives.

How to diagnose DTC U1103 on BMW

To diagnose the DTC U1103 code on a BMW, you can follow these steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s control module.
2. Inspect the wiring and connectors related to the cruise control system for any visible damage or corrosion.
3. Check for any loose connections or poor grounds in the system.
4. Perform a system reset and retest the cruise control functionality.

How to fix DTC U1103 on BMW

To fix the DTC U1103 code on a BMW, you can try the following solutions:

1. Repair or replace any damaged wiring or connectors in the cruise control system.
2. Replace the cruise control module if it is found to be faulty.
3. Update the software in the control module to the latest version.
4. Ensure proper shielding and grounding for electronic components to prevent interference.

How to erase DTC U1103 on BMW

To erase the DTC U1103 code on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the control module. After fixing the underlying issue causing the code, perform a system reset and retest the cruise control system to ensure the error does not reoccur.

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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