Table 1 shows one common vehicle speed control related problems of the 2018 Chevrolet Colorado.
| Problem Category | Number of Problems |
|---|---|
| Vehicle Speed Control problems |
My 2018 Chevrolet Colorado diesel has had repeated diesel emissions/dpf-related failures that cause the vehicle to enter reduced-power or limp mode. This is a safety issue because the truck suddenly loses power and cannot accelerate normally. The most serious incident occurred while driving over santiam pass in oregon. The vehicle went into reduced-power/limp mode on a mountain highway, leaving me unable to maintain normal speed or accelerate safely. I lost power needed to pass traffic and had limited ability to respond to road conditions. The problem has happened several times. It has also occurred while I was towing my boat, which left me unable to continue the trip safely and created a hazardous situation because the truck could not maintain normal towing power. The issue appears related to the diesel particulate filter/emissions system and repeated dpf/regen or exhaust aftertreatment problems. I am concerned that a design, calibration, or emissions-system defect is causing sudden power reduction during normal driving and towing. This creates an unreasonable safety risk, especially on mountain passes, two-lane highways, and while towing. I am requesting that NHTSA review this as a potential safety defect involving the 2018 Chevrolet Colorado diesel dpf/emissions system and reduced-engine-power strategy. I am also requesting that this complaint be considered with any similar complaints, recalls, technical service bulletins, or emissions campaigns related to dpf regeneration, particulate matter sensor diagnostics, reduced engine power, or limp mode on the 2. 8l duramax Chevrolet Colorado.
The stibilitrack in the truck went out just after 20 minutes of driving in 34 degree rainy weather at 65 mph. Found out that it was the passenger front bearing reluctor had chipped away, which is what the wheel speed sensor reads. Once one those go out, you lose stibilitrack and abs. I believe that this is a significant safety issue, and a poorly engineered/designed system. The rear system reads gear which is what should be in the front should have as well, not a "magnetic ring". This should be fixed so that noone gets injured or killed. It's also a waste of consumer money that you have to change out an entire wheel bearing hub assembly to fix the issue. Shame on the company. In the photos, notice that half the black ring (the reluctor) is missing.
The wiring harness was touching the air condenser line. The line gets hot when air conditioning is used. It melted causing my truck to throw a lot of random alarms. It also would turn my cruise off and make it down shift all of a sudden startling me. Melted wires are also a fire hazard. There is a bulletin for wire harness chafing that GMC knows about this issue. If it had melted something major and shut my truck down while driving down the interstate it would put me and anybody around me in danger. It was wired back together but is still not fixed. Might need a new wiring harness.
About a year ago, I started getting a slight shudder in my transmission so I took it to the dealer for repair. They couldn't get it to shudder. Several times I'll be driving down the road at or around 45mph and the truck will start shuddering so bad I feel like I have to pull off the road. Every time I take it to the dealer for repair I end up losing my truck for a day and they tell me they can find anything wrong even though this is a known issue and there is a TSB out to fix the issue.
The torquer converter its the problem I find out a day on highway I was driving and the truck lose power it takes time to move to other gear and make a weird sound I take the truck to the chevy dealer and they just flush the transmission fluid and they said will fix the problem but after that get it worse it claps when put it in reverse or drive it use to shakes when you driving even at not high speed. The problem is not solve and the guy from the dealer told me GMC will not let them change the part is his own words. He said you have a good warranty don't worry but I need solution and the dealer doesn't show any interest to fix my truck problem, I have to rent a car apparently was cover for my insurance but a week later they call me because they have a issue with the car I rent and just rented for 24 hours. Is why I'm doing this complaint to find someone can help me and finally my truck get fix.