BMW DTC U1190 – Lost Communication With TCM via A- and FA-CAN
DTC U1190 meaning on BMW
DTC U1190 on a BMW indicates a communication error between the Transmission Control Module (TCM) and the vehicle’s network. Specifically, it signifies a loss of communication via the A-CAN and FA-CAN networks.
BMW DTC U1190 symptoms
Symptoms of DTC U1190 on a BMW may include issues with shifting gears, transmission slipping, harsh shifting, or the transmission going into limp mode. Additionally, warning lights such as the transmission warning light or the check engine light may illuminate on the dashboard.
BMW DTC U1190 causes
The most common causes of DTC U1190 on a BMW are faulty wiring or connectors between the TCM and the CAN bus, a malfunctioning TCM, or issues with the CAN bus itself. Water damage, corrosion, or physical damage to the wiring harness can also lead to this communication error.
BMW DTC U1190 seriousness
DTC U1190 should be addressed promptly as it can affect the proper functioning of the transmission system in the vehicle. Ignoring this fault may lead to further transmission problems and potential safety hazards while driving.
How to diagnose DTC U1190 on BMW
To diagnose DTC U1190 on a BMW, a diagnostic scan tool capable of reading BMW-specific fault codes is required. The technician should check for any additional fault codes present in other control modules. A visual inspection of the wiring harness and connectors related to the TCM and CAN bus should be performed to look for any visible damage or corrosion.
Additionally, conducting a continuity test on the wiring harness and checking the TCM for proper power and ground connections can help pinpoint the source of the communication error.
How to fix DTC U1190 on BMW
Fixing DTC U1190 on a BMW involves addressing the root cause of the communication error. This may include repairing or replacing damaged wiring harnesses, connectors, or components related to the TCM and CAN bus. Ensuring proper connections and addressing any water intrusion or corrosion issues is crucial.
How to erase DTC U1190 on BMW
Once the underlying issue causing DTC U1190 on a BMW has been resolved, the fault code can be cleared using a diagnostic scan tool. After the repair is completed, the technician can erase the fault code from the vehicle’s memory, resetting the system and turning off any warning lights on the dashboard.
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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