Sierra 3500 4WD V8-6.6L DSL Turbo VIN 2 (2004)
Steps 1-9
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step tests for a faulty tow/haul switch.
3. This step tests for voltage input from the BCM to the tow/haul switch.
6. This step tests for ground integrity.