BMW U1121: Lost Communication With Power Management Battery Voltage
Is your scanner showing BMW U1121?
No worries. We'll show you what it means and how to deal with it.
BMW U1121: Lost Communication With Power Management Battery Voltage
OVERVIEWWhat Does The BMW U1121 Code Mean?
Key on for 800ms, and the DME detected that it has lost communication with the power management battery voltage during its initial startup for 40ms (2 message cycles). The Engine Control Module (DME) communicates with all databus-capable control modules.
What Are The Potential Causes Of The BMW U1121 Code?
- DME has failed
- Terminal resistance for CAN-bus are faulty
- Can data bus wires have short circuited to each other
Recommended Parts
Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:
>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> BMW Battery Terminal
>>> 72-9402 Engine Control Module - Direct Fit, Sold individually
Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!
Reference Sources
BMW U1121, DTCDECODE.
