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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 137 (Engine Controls Self Diagnostics - 4.8L, 5.3L & 6.0L Gasoline) >> System Tests >> Malfunction Indicator Lamp Always On >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 GMC Savana and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number in the diagnostic procedure.

  1. 2

    This step determines if the condition is with the MIL control circuit or the PCM.

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