Test Description

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

6. The module which was not communicating on the class 2 serial data circuit may have set Loss of Communication DTCs for those modules that it was monitoring.

Fig 1: DTC U1001-U1254 (1 Of 2)
Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC U1001-U1254 (2 Of 2)
Courtesy of GENERAL MOTORS CORP.