The flapper just inside the fuel filler pipe has broken loose, allowing water or dust to enter, potentially causing engine failure.

- Santa Fe, NM, USA

I along with other people who own this model of truck with the diesel engine around 60,000 to 70,000 Miles have part number 55488542 which is the fuel feed line that rubs up against the AC line and starts to leak fuel. https://www.coloradofans.com/threads/2016-diesel-canyon-severe-fuel-leak.410108/ I along with others have numerous complaints to the Chevy dealership they said this is a common issue because of the type of line that was used and placement that it rubs up and down and since it's a diesel and vibrates a lot and basically the hose is going against the AC Muffler which is a canister and rubs it until there is a hole from rubbing. The link I added to this is one of many. This is dangerous it is fuel it is pouring out and it is in contact with hot parts of the engine

- North Port, FL, USA

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.

- San Antonio, TX, USA

During some starts (in morning after not driving for several hours), the engine will have a pulsing idle ~750-1000 RPM. After letting it sit for a minute to warm up, I drive down the road. If I am able to drive without stopping, there will be no issues. However, if I come to a stop within 0.5 miles or so, the engine will shut off. When I try and restart, the engine will stall repeatedly. The engine will eventually restart. There have been no codes produced nor any lights on the dash board. Has happened several times.

- Baltimore, MD, USA

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.

- Florida, NY, USA

Purchased new Chevy Colorado 4X4 extended cab with 3.6-liter V6, transmission 8-speed model 8L45. Transmission developed shudder during light throttle acceleration between 30 and 70 mph. Shudder is cyclic lasting 4 - 12 seconds, reaccurring 45 - 90 seconds. Shudder feels similiar to driving over mild rumble strips or rough pavement. First notice transmission problem around 1200 mile mark, total mileage on vehice as of April 11, 2019 is 2750 miles. More information can be found with ge service information (si) as a techinical service bulletin (tsb). Refer to these GM tsb's 16-na-175, 18-na-177, and 18-na-355.

- Edgewood, WA, USA