Cadillac U1000: Class 2 Communication Malfunction
Is your scanner showing Cadillac U1000?
No worries. We'll show you what it means and how to deal with it.
Cadillac U1000: Class 2 Communication Malfunction
OVERVIEWWhat Does The Cadillac U1000 Code Mean?
Modules connected to the Class 2 circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules.
What Are The Potential Causes Of The Cadillac U1000 Code?
- Class 2 circuit is open, shorted to ground or shorted to power
- PCM ignition power circuit(s) has a high resistance condition
- PCM main ground circuit(s) has a high resistance condition
- SDM (module) could be shorted pulling the voltage low
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
>>> Dorman 86689C 399 PC Automotive Electrical Repair Kit
>>> GM Genuine Parts Airbag Sensing And Diagnostic Module
Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!
Reference Sources
- GM, 2002, Service Bullettin.
- GM, 2016, Service Bullettin – No Crank Key Stuck In Ignition Lock Cylinder Multiple ECM Codes And U1000 Set In Class 2 Modules.
