Eight problems related to wiring have been reported for the 2004 Chevrolet Colorado. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Chevrolet Colorado based on all problems reported for the 2004 Colorado.
Idle control via electronic throttle body raises rpm very high when the accelerator pedal is not depressed, causing uncontrolled acceleration of vehicle during coasting or when brake pedal is applied. Turning the vehicle off with the key is the only action that has resulted in a cessation of extremely high idle. After restarting the vehicle, the symptom is gone and the vehicle operates normally. This behavior is erratic and inconsistent, the problem has been difficult to duplicate during diagnosis. All testing and inspection of the electronic throttle body, wiring harness, connectors, and functions within the engine computer has shown no defect or indication that a wiring fault, dirty throttle body, or other "wear and tear" item is the cause of this intermittent revving at idle. The most recent event occurred on August 9th 2017. This has been occuring for at least 6 months, on average once a month in frequency.
Problem # 1: had to replace the hvac resistor and its wiring harness. Resistor plug and the harness plug was burned and melted. . . Fire hazard! this safety hazard could have burned up my vehicle. Problem #2: the abs warning light keeps coming on and when this happens (every day or so) the brakes do not work properly. This seems to happen when the vehicle is not parked on a level surface. The fault occurs once the vehicle moves forward from the parked position.
Airbag light is on. My truck has never been in an accident. Through research I have found that the wiring in the door breaks.
Heater fan does not work. It is wintertime and I have two children ages 4 1/2 years and 9 months. Faulty wiring for the fan.
The vehicle fan control fails to function on settings 1, 2, or 3. Setting 4 functions properly. The connector plug at the fan housing and wiring harness shows signs of charring.
The dashboard lights will stop working if your driving at night and turn the car off and then turn it back on. They will not work until the car sits for a long period of time. This started soon after buying the car brand new, but the dealership couldn't find anything wrong. Second complaint, the heater/air conditioner fan had an electrical fire at where the harness plugs into the fan motor. The fan will only work on high. When I looked online at other complaints about the same problem, I unplugged the fan and noticed the plug was burnt. I have photos that I can send. It appeared the electrical fire continued down the plastic plug to where the wires are exposed. This could have been a major incident if I didn't notice it. There are a lot of complaints about this with Colorado trucks online. Also when driving at night, my dash lights and instrument lights flicker as if there is another electrical short somewhere in the wiring harness.
Blower fan works intermittently. Finally stopped working on settings 1,2 and 3, will only work on setting 4. Replaced resister 1st from dealer, the climate switch panel. Finally the fan wouldn't run @ all, took to local mechanic replaced wiring harness & fan motor. Took about a year to get truck fully repaired.
The chevy Colorado extended cab model has a history of the wire breaking in the same location causing the air bag (srs) light to remain on. I believe this manufacturing defect may not activate the srs in the event of a side impact. The wire in question is located inside a rubber boot between the rear doors and the main cab body. It seems if you use the rear doors it will develop a broken wire.