Test Description

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 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 for voltage supplied to the EBCM from the PCM.
5. This step tests for a shorted resistor in the PCM or a short to voltage within the requested torque circuit by verifying that a large voltage drop occurs when a test lamp is connected in parallel with the DMM.

Fig 1: DTC C0298 Or P1571 (1 Of 2)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC C0298 Or P1571 (2 Of 2)

Courtesy of GENERAL MOTORS CORP.