U1185 – BMW DTC

BMW DTC U1185 – Lost Communication with FA-CAN

DTC U1185 meaning on BMW

The DTC U1185 code on a BMW indicates a communication error between the vehicle’s modules and the FA-CAN (FlexRay Communication) network. This error specifically points to a lost communication with the FA-CAN system, which can affect the proper functioning of various vehicle systems.

BMW DTC U1185 symptoms

Symptoms of the DTC U1185 code on a BMW may include:

• Check Engine Light (CEL) illuminated on the dashboard
• Loss of communication with certain vehicle modules
• Erratic behavior of electronic systems
• Reduced performance or drivability issues

BMW DTC U1185 causes

The DTC U1185 code on a BMW can be triggered by various factors, including:

• Faulty FA-CAN communication module
• Wiring or connection issues in the FA-CAN network
• Interference from other electronic devices
• Software glitches or malfunctions

BMW DTC U1185 seriousness

The seriousness of the DTC U1185 code on a BMW depends on the extent of the communication loss and the affected systems. Ignoring this code can lead to further malfunctions in critical vehicle components, potentially compromising safety and performance.

How to diagnose DTC U1185 on BMW

To diagnose the DTC U1185 code on a BMW, a mechanic may perform the following steps:

1. Use a diagnostic scanner to retrieve the fault codes
2. Inspect the FA-CAN communication module and wiring for any visible damage
3. Check for loose connections or corrosion in the FA-CAN network
4. Perform a communication test to identify the source of the lost signal

How to fix DTC U1185 on BMW

To fix the DTC U1185 code on a BMW, the following steps may be taken:

1. Repair or replace any damaged wiring or connections in the FA-CAN network
2. Reset the communication module and re-establish the connection
3. Update the software of the affected modules to resolve any compatibility issues
4. Perform a final communication test to ensure the code is cleared and the systems are functioning properly

How to erase DTC U1185 on BMW

To erase the DTC U1185 code on a BMW, follow these steps:

1. Use a diagnostic scanner to clear the fault codes
2. Ensure that the underlying issue causing the code has been resolved
3. Perform a test drive to confirm that the code does not reappear

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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