One problem related to dash wiring has been reported for the 2004 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 GMC Sierra 1500 based on all problems reported for the 2004 Sierra 1500.
2004 GMC sierra crew cab - burning odor, soot on dashboard, rear windows fail to operate. No blown fuses. Taken to thompson's GMC dealership in placerville CA for repair on October 20. Gm service department states: wiring harness for rear windows and door locks passes under and rubs against arm of parking brake pedal, leading to short circuit and failure of rear windows. Wiring harness replaced by gm service department. I can see that the new wiring harness also comes into contact with arm of parking brake pedal! I have the old part. Consequences: burned wiring, loss of vehicle for 8 days, $772. 04 in repair cost.