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.

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OBDCodex, Editor

Cadillac U1000: Class 2 Communication Malfunction

DIY Difficulty Level
Repair Cost
Can I Still Drive?

What 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

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