Test Description

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. 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 W/O JL4 (1 Of 2)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC C0265 Or C0266 W/O JL4 (2 Of 2)

Courtesy of GENERAL MOTORS CORP.