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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 listed below refer to step numbers in the diagnostic procedure:

  1. 4  - This step tests the TCM and circuit 400 for voltage at the PCM connector.
  2. 5  - This step tests for continuity and a short to ground in the wiring system between the TCM and PCM.

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