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 numbers below refer to the step numbers on the diagnostic table.

4. This step tests if the battery positive voltage circuit can supply adequate power to the system relay.
7. A shorted ABS pump motor or shorted motor circuitry may damage the contacts within the system relay. Follow this step to prevent damage to a replacement EBCM.

Fig 1: DTC C0265 Or C0266 - Diagnostic Procedure Table (Steps 1-4)
Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC C0265 Or C0266 - Diagnostic Procedure Table (Steps 5-11)
Courtesy of GENERAL MOTORS CORP.