BMW DTC U1255 – Lost Communication with Status Gear Train
DTC U1255 meaning on BMW
DTC U1255 on a BMW indicates a ¨Lost Communication with Status Gear Train¨ fault. This diagnostic trouble code (DTC) is specific to BMW vehicles and typically points to a communication issue between the transmission control module and other related modules within the vehicle.
BMW DTC U1255 symptoms
Symptoms of DTC U1255 on a BMW may include erratic shifting behavior, transmission slipping, or the transmission going into a fail-safe mode. Additionally, you may experience warning lights on the dashboard related to the transmission system.
BMW DTC U1255 causes
The causes of DTC U1255 on a BMW can vary, but common reasons include faulty wiring connections, a malfunctioning transmission control module, issues with the CAN (Controller Area Network) bus communication system, or a software glitch within the vehicle’s control modules.
BMW DTC U1255 seriousness
While DTC U1255 may not always result in immediate drivability issues, it is important to address this fault as it can lead to transmission-related problems and potentially affect the overall performance and safety of the vehicle. Ignoring this fault could result in more severe transmission issues over time.
How to diagnose DTC U1255 on BMW
To diagnose DTC U1255 on a BMW, a diagnostic scan tool capable of reading manufacturer-specific codes is required. The technician will need to retrieve the fault codes, check for any related codes, inspect the wiring harness for damage or loose connections, and perform a thorough diagnosis of the transmission control module and related components.
How to fix DTC U1255 on BMW
Fixing DTC U1255 on a BMW may involve repairing any damaged wiring connections, replacing faulty components such as the transmission control module if necessary, updating software if a software glitch is suspected, and ensuring proper communication between the control modules. It is recommended to follow the manufacturer’s diagnostic and repair procedures for this specific fault code.
How to erase DTC U1255 on BMW
Once the underlying issue causing DTC U1255 on a BMW has been diagnosed and fixed, the fault code can be cleared using a diagnostic scan tool. The technician can access the vehicle’s onboard computer system, navigate to the fault code section, and select the option to clear the stored DTC U1255 code. After clearing the code, it is advisable to test drive the vehicle to ensure the fault 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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