Test Description

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 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.

3. This step tests for a short to ground in the 4WD Low signal circuit (CKT 1694).
4. This step tests for an open in the 4WD Low signal circuit (CKT 1694), a faulty transfer case control module, active transfer case vehicles, or transfer case switch, non-active transfer case vehicles.

Fig 1: DTC P1875 (Steps 1 - 3)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC P1875 (Steps 4 - 10)

Courtesy of GENERAL MOTORS CORP.