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.

3. This step tests for voltage supplied to the PCM from the EBCM.
4. This step tests for a shorted resistor in the EBCM or a short to voltage within the circuit, by verifying that a large voltage drop occurs in the circuit when the test lamp is placed in parallel with the DMM. The PCM may be damaged if either of these conditions is present.

Fig 1: DTC C0244 (w/JL4) (1 Of 2)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC C0244 (w/JL4) (2 Of 2)

Courtesy of GENERAL MOTORS CORP.