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DTC U1001-U1254: Module U1XXX Error: Notes

WARNING: This page is about a different car, the 2002 Pontiac Aztek and 2002 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Control Modules & ID Numbers
G01726411Courtesy of GENERAL MOTORS CORP.

When more than one Loss of Communication DTC is set in either one module or in several modules, diagnose the DTCs in the following order:

  1. Current DTCs before history DTCs unless told otherwise in the diagnostic tables.
  2. The DTC which is reported the most times.
  3. From the lowest number DTC to the highest number DTC.
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