Test Description

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. 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 Diagnosis (Steps 1-5)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC C0265 or C0266 Diagnosis (Steps 6-11)

Courtesy of GENERAL MOTORS CORP.