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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.

  1. 2)  - Tests for an intermittent conditions.
  2. 3)  - Determines whether the failure is the result of a faulty 4WD system.
  3. 4)  - Determines if the failure is the result of a faulty instrument cluster.
  4. 5)  - Determines if the failure is the result of a faulty PCM.
Fig 1: 4WD Indicator Always On Diagnosis
G01668790Courtesy of GENERAL MOTORS CORP.
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