2018 CHEVROLET COLORADO Complaints

We reported issues with our thermostat to our dealer back in September of 2022. The vehicle would not defrost or heat. We were then told the thermostat required replacements but there was no part in existence and they would notify us when it became available. After following up numerous times with no actionable timeline from the dealer we consulted with a secondary mechanic who confirmed the issue was related to a thermostat sensor malfunction and would require a replacement thermostat. Again we were told that the item was not available from GM and we would be contacted when more information was available. A SPAC case was created by our dealer in October of 2022, notifying the system of the urgent need and our dealer has followed up numerous times that GM has not provided any timeline for replacement. I have also filed a separate claim in January of 2023 to GM customer service notifying them of the ongoing issue and escalating to upper management. I have not heard back on mitigation or rectification plan for our issue. This ongoing issue is a major safety concern that has rendered my vehicle unfit for operation. I am unsure why GM is not making this major safety concern a priority because we are now in the middle of a Chicago winter we’re temperatures are regularly below freezing. I cannot defrost my windows or maintain a safe cabin temperature. This is unsafe for me to operate let alone use the vehicle to transport my child because of the immediate danger it would place her and I in. I am now paying for a vehicle that has sat inoperable in my driveway for 4+ months with no end in site and opening is up to additional damages because it has had to remain inoperable for an extended period of time.

when traveling at any speed usually between 1200-2200 RPM there is a rumble strip/ vibration feeling coming from the vehicle most notably around 35-45 MPH but happens at all speeds. I took it to my local mechanic and it was not a suspension, tire or drive shaft issue. i was informed it seems to be coming from the transmission. upon looking on other forums about this issue it seems to be a common problem with the 8 speed transmissions on the Colorado's. i still have been unable to fix this issue. No indicator lights are on, engine runs fine its only when traveling when the engine is between 1200-2200 RPM

The HVAC module temp door is cracked, as previously seen in the 2015-2016 recall for Chevrolet Colorado’s and GMC Canyons. This forces the temperature to be 33 degrees F colder than requested. This poses a risk to those that live in cold winter climates, as there is no heat available in the vehicle.

A/c lines near driver side wheel well has chafed through fuel line and wire harness.Causing a couple thousand dollars in damage.Nor warning indicators leading up to either incidents. My chevy dealership mis diagnosed it twice and has now found the issue. Fuel lines leak can cause fires and as far as the electrical issue I've been left stranded with my 3 year old daughter a couple of times..Have looked up forums and many people have had the same issue.

My 2018 Colorado Z71 (40,000 miles) suffers from transmission shudder intermittently. Dealer took it for a 14 mile test drive and was unable to duplicate. Blamed it on the tires. Refused to flush transmission fluid in accordance with GM TSB 18-NA-355. Shudder becomes worse when trailering boat. Known issue to GM, however, dealers refuse to perform the solution provided by GM in the absence of a recall.

problems shifting shaking and vibration at higher speeds very noticeable while pulling a trailer 11449007 reference number

My 2018 Chevrolet Colorado is having transmission issues. It started at 90,000 miles and is now getting worse. The transmission stutters at various speeds and is very pronounced while going up an incline. I have taken it in several times to a chevy dealership only to be told nothing is wrong and no warning lights are on. Finally and just this week I have a dealership that is saying a code came up saying the transmission fluid needs to be change since they receive a service technical bulletin saying the wrong transmission fluid was original installed and needs to be replaced. The repairs are at my costs and it just doesn't seem right. Is there anything I can do?

The contact owns a 2018 Chevrolet Colorado. The contact stated that while driving approximately 35 MPH, the vehicle shuddered and started shaking abnormally. There were no warning lights illuminated. The vehicle was taken to the local dealer where the transmission was flushed and the vehicle was diagnosed. The contact was informed that the torque convertor needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure however, no additional assistance was provided. The approximate failure mileage was 82,630.

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.

Occasionally the ignition key cannot be turned to the OFF position and cannot be removed. After shifting to Park, the key can be turned to position 1 (ACC) but will not turn all the way to position 0 (OFF) and therefore the key cannot be removed from the steering column. So far I have been able to temporarily resolve the problem by re-starting and stopping the engine several times. The number of times the cycle must be repeated is not consistent. On one occasion, the driver was not able to remove the key so the key was left in position 1 for several hours. This resulted in a drained battery and the truck would not start. We needed a mechanic to come by and jump start the truck.