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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 952 (Transfer Case - Mp 1222/1225/1226-NQG) >> Diagnostic Information and Procedures >> Four-Wheel Drive Indicator Inoperative >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Place the vehicle in 4WD install a scan tool and using engine data 2 look at the display for 4WD signal.
  2. Verify that the scan tool indicates that the vehicle is in 4WD.
    • If the scan tool indicates that the vehicle is in 2WD go to circuit system testing.
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