2004 Chevrolet Colorado Problems

What owners report

Owners of the 2004 Chevrolet Colorado most often write about two very different things: electrical gremlins — especially a heater blower resistor/harness that only lets the fan run on high or overheats — and frame rust that appears as the truck ages. Anti-lock brake faults with a grinding or hard pedal are also common, and many of these reports arrive at high mileage, though brake complaints often show up well below 100,000 miles.

1. 1
   Body and structure

   Frame and underbody rust-through

   • 52 complaints (14%)
   • median 122,150 mi at 14.0 yrs old (38 state mileage)
   • owner-quoted repair $4,000 (median of 5 quotes)
   • filed 2006–2023

   Complaints describe the frame rusting through, especially where the cab meets the bed and around the rear spring mounts and torque box. Owners report the bed shifting against the cab, leaf springs rolling inward, and in some cases suspension or bed separation from the frame; mechanics have told owners the frame rails or torque box need replacement. Some also report water collecting in the cab floor and mold under the carpeting. Mostly reported past 80,000 miles and often on trucks 10 or more years old, in states with road salt.

   2 related service bulletins

   What to check: Have the frame inspected from below, paying attention to the section under the cab-to-bed gap, the rear spring hangers and the torque box; poke at flaking areas and check the cab floor and carpet for dampness or mold.

   2 excerpts from owner complaints in NHTSA records

   “I have a 2004 chevy Colorado z 71 ls. I bought it 4 years ago and it had 58,000 miles and I am the second owner of the truck. It has 115,000 miles on it and I already have frame rot. There is a crack in the frame between the cab and box which is causing my box touching the back of the cab that's causing damage to the cab. If you could please contact me.”

   NHTSA complaint #10668087, filed 2014-12, 115,000 miles

   “Frame has rusted out to the point that it is unrepairable, vehicle has 92000 miles good condition everywhere else. This is quite a common problem with colorados. It will not pass safety standards, quite honestly it is a very dangerous situation that many people are experiencing with these vehicles. It seems odd that toyota was forced to replace frames due to poor quality and rust issues yet these colorados are just as bad.”

   NHTSA complaint #11292121, filed 2019-12, 92,000 miles
2. 2
   Brakes

   ABS warning light with grinding or hard brake pedal

   • 51 complaints (14%)
   • median 46,056 mi at 5.8 yrs old (44 state mileage)
   • 4 mention a crash, fire or injury
   • filed 2004–2019

   The ABS light comes on and the brakes grind or pulse as if on a slippery surface, sometimes on dry pavement and often at low speed, with owners describing a hard pedal and reduced stopping. Dealers frequently pointed to front wheel hubs, bearings and wheel speed sensors, and in several cases no cause was found or the problem returned after repair. Reported from roughly 35,000 to 80,000 miles and up, often during low-speed braking or turning.

   What to check: Watch for an ABS lamp on the test drive and listen for grinding at low speed; ask whether hubs, bearings or wheel speed sensors have been replaced, and have the ABS codes scanned before buying.

   2 excerpts from owner complaints in NHTSA records

   “Periodic ABS system failure occurring while driving and applying the brakes. Has been a failure for four years made efforts to remedy the problem by calling them and no satisfaction. I've asked other Colorado owners and they said they have this problem in the 05, 06.. I hit into a school bus.”

   NHTSA complaint #10597529, filed 2014-06, 60,000 miles

   “My ABS fault light is coming on and the brakes are grinding as though I am sliding across an icy road. I just put on new brake pads at a dealership in march and no one mentioned that I had a problem. From what I heard the problem can be pulling the ABS plug or spending thousands at a dishonest dealership. It is very dangerous and I have read on forums that this ABS fault issue is a wide spread serious one. …”

   NHTSA complaint #10458267, filed 2012-05, 175,000 miles
3. 3
   Electrical system

   Heater blower only works on high / resistor and harness melt

   • 30 complaints (8%)
   • median 80,000 mi at 7.5 yrs old (25 state mileage)
   • 6 mention a crash, fire or injury
   • filed 2005–2020

   The climate-control fan stops working on the lower speeds and eventually runs only on the highest setting. Several owners describe the blower resistor and its connector getting hot enough to burn or melt the harness, with smoke noticed under the glovebox area. Dealers typically replaced the resistor, and sometimes the connector or blower motor, with complaints describing repeat failures at low mileage and again later out of warranty. Reported from about 15,000 miles upward, often recurring every 30,000 miles or so.

   What to check: Turn the fan through every speed setting with the engine running; if only high works, expect resistor and connector work. Ask whether the resistor and pigtail were replaced and look for browned or melted wiring at the connector.

   2 excerpts from owner complaints in NHTSA records

   “Turn ignition to off position and park indicator light and radio stays on. Have to jiggle key to get to go off. Come out several hours later and park indicator light and radio are back on./ also, heat and air control fan only works on high speed. I was told it was a resistor ,I replaced resistor and it still continues to do this. I can reach down and jiggle the resistor and it works on all speeds for a short while only. Have a friend with gmc canyon that has had this problem since his was new also.”

   NHTSA complaint #10627685, filed 2014-08, 122,652 miles

   “I've had to replace 2 heater blower resistors due to a meltdown, this is a potential fire hazard and should be put on a recall notice. I was driving around 40 MPH at the time .”

   NHTSA complaint #11355441, filed 2020-09, 85,000 miles
4. 4
   Exterior lighting

   Brake lights out and cruise control stops working

   • 43 complaints (12%)
   • median 44,900 mi at 4.5 yrs old (35 state mileage)
   • 1 mention a crash, fire or injury
   • filed 2005–2019

   Owners report the brake lights, including the center high-mounted lamp, failing to illuminate while the truck otherwise drives normally, and the cruise control becoming inoperative at the same time. Complaints describe repeated switch replacement and, in some cases, owners being told their vehicle was not covered by the brake light switch recall. Reported from a few thousand miles up to about 140,000 miles, with several cases soon after purchase.

   Recall 09V310000Recall 06V139000

   What to check: Have someone watch the rear lamps while you press the brake pedal, then try the cruise control; ask whether the brake light switch recall work was completed and whether the switch has been replaced since.

   2 excerpts from owner complaints in NHTSA records

   “Brake lights have failed four times in 18 months. All dealer does is replace switch. The first time they failed I noticed 2 vehicles nearly rear ending me. Then someone told me I had no brake lights. Now I know brake lights are out when cruise control quits working. Gm wants to give $2,500 to trade vehicle but shouldn't they be required to fix problem. I can't trade without discussing this problem reducing my trade in value.”

   NHTSA complaint #10143970, filed 2005-11, 7,818 miles

   “I was almost rear ended today and the driver behind me came up to my window and told me that I had no brake lights, not even the center light. I have also noticed that I have no cruise control. The bulbs are new. I called the dealership and asked them if they have seen this problem and they said they haven't seen it on the Colorado. I checked the internet and found several other owners who have experienced the same problem, they directed me to the NHTSA website where I found the other complaints. …”

   NHTSA complaint #10151650, filed 2006-03, 36,500 miles
5. 5
   Air bags

   Airbag warning light and unexpected deployment

   • 28 complaints (8%)
   • median 92,364 mi at 9.2 yrs old (23 state mileage)
   • 8 mention a crash, fire or injury
   • filed 2004–2020

   Several owners report the airbag warning light staying on, which they understood to mean the bags were disabled, traced to damaged wiring in the harness that passes to the extended-cab rear door. A few describe the driver airbag deploying with the key turned to start while the truck was parked, and one reports a bag that did not deploy in a collision. Spread from very low mileage to over 160,000 miles, with several reports on extended-cab trucks.

   What to check: Confirm the airbag lamp comes on and goes out with the key, and check the door-to-cab wiring on extended-cab models for chafing; ask whether the harness has been replaced.

   2 excerpts from owner complaints in NHTSA records

   “2004 chevy Colorado turned on partially to the on position to start the vehicle and the drivers airbag popped out in my face and hit me very hard .this vehicle was not hit or anything, it was in a standard parking lot and when it popped out my hearing when blank or deaf like. The vehicle was not running at the time of the explosion. …”

   NHTSA complaint #10383184, filed 2011-02, 121,000 miles

   “Air bag warning light was lit on my 2004 Chevrolet Colorado extended cab which I assume would make the air bags inoperable during an accident. Problem determined to be a broken wire in the harness between the cab and the back door.”

   NHTSA complaint #10446006, filed 2012-01, 125,000 miles

Buying note. On this model year, a careful underside inspection matters as much as the test drive — frame rust is the costliest thing owners describe — and it is worth confirming the brake light switch recall was done and that the blower fan works on all speeds before purchase.

Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.