Cadillac U1512: Inter-device Dedicated Bus Lost Communication With Device 2

What Does The Cadillac U1512 Code Mean?

Condition for setting the DTC: The system voltage is between 9-16 volts.

What Are The Potential Causes Of The Cadillac U1512 Code?

• Both DTC U1511 and U1512 will set if an open/high resistance in the local interconnect network bus circuit is between the door module and the first splice.
• Only 1 DTC (U1511 or U1512) will set if an open/high resistance in the local interconnect net.

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
>>> GM Genuine Parts Electronic Compass Module

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Reference Sources

• GM, 2012, Service Bullettin – False Low Beam Failure Message Displayed.
• GM, 2013, Service Bullettin – False Low Beam Failure Message Displayed./li>
• GM, 2015, Service Bullettin – Service Adaptive Headlamp Message Displayed, DTCs B257C and B257D.
• GM, 2019, Service Bullettin – PIT5698 LIN Bus Diagnostic Information.
• GM, 2020 Service Bullettin – PIT5698A LIN Bus Diagnostic Information.