BMW DTC U1184 – Lost Communication with A-CAN
DTC U1184 meaning on BMW
The Diagnostic Trouble Code (DTC) U1184 for BMW indicates a communication error with the A-CAN network. The A-CAN (Accessory Controller Area Network) is a communication network within the vehicle that allows various control modules to exchange information. When this DTC is triggered, it means that there is a loss of communication between the modules connected to the A-CAN network.
BMW DTC U1184 symptoms
Symptoms of the DTC U1184 on a BMW may include:
- Malfunction indicator light (MIL) or check engine light illuminated on the dashboard
- Loss of communication with certain vehicle systems
- Erratic behavior of electronic components
BMW DTC U1184 causes
The potential causes of the DTC U1184 on a BMW include:
- Faulty wiring or connections in the A-CAN network
- Defective control module connected to the A-CAN network
- Interference from other electronic devices
BMW DTC U1184 seriousness
While the DTC U1184 may not directly affect the drivability of the vehicle, it is important to address this issue promptly. Loss of communication between control modules can lead to malfunctions in various vehicle systems, affecting overall performance and safety.
How to diagnose DTC U1184 on BMW
To diagnose the DTC U1184 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s computer
- Inspect the wiring and connections in the A-CAN network for any damage or corrosion
- Check the control modules connected to the A-CAN network for proper functioning
- Perform a communication test to identify the source of the communication error
How to fix DTC U1184 on BMW
To fix the DTC U1184 on a BMW, the following steps may be taken:
- Repair or replace any damaged wiring or connections in the A-CAN network
- Replace any faulty control modules causing the communication error
- Ensure proper grounding and shielding of the A-CAN network to prevent interference
How to erase DTC U1184 on BMW
After addressing the underlying issue causing the DTC U1184, the code can be cleared using a diagnostic scanner. The mechanic can use the scanner to erase the fault code from the vehicle’s computer, resetting the system and turning off the MIL or check engine light.
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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