2023 GMC CANYON Complaints

Top radiator hose is leaking coolant. Radiator hose O ring appears to be faulty.

Upper radiator hose gasket leaks at connection point to radiator and no gasket replacement part. GMC forces you to buy entire hose

Noticed a coolant leak on drivers side and took to dealership was told was the upper radiator hose but was unable to make repairs due to national backorder and only suggestion was to drive until parts come in and keep a check on the coolant level, My truck only has 28,708 miles and shouldn't have to keep an eye on coolant level I feel that is very unsafe

The upper radiator hose on a significant number of these trucks is failing prematurely. In my case, the failure occurred at just over 35,000 miles. Numerous reports on owner forums (such as the Colorado Chevy / GMC Canyon forum), YouTube, and other platforms document the same issue, indicating this is not an isolated incident but a widespread defect. Because this hose is part of the cooling system, its failure can quickly lead to engine overheating and potentially catastrophic engine damage. The root cause appears to be an engineering flaw in the sealing method: GM uses a rubber seal instead of a durable, high-quality o-ring to connect the upper hose to the radiator. Despite the seriousness of this defect, my local GMC dealer informed me that—since it is not currently a recall item—they could only schedule service for the following week, requiring me to leave the truck with them for 7–10 days before repairs would be completed. This is unreasonable for consumers who rely on these vehicles daily. Given the safety implications and the potential for engine failure, this issue warrants immediate attention. It should be classified as a recall item. Thousands of examples are already documented online, and GM’s own repair data would likely reveal thousands more instances of this same failure.

The whole radio screen and dashboard have gone completely black and will not come on. Can not see anything. Took it to GMC dealership mechanic. Mechanic did diagnostic and said he didnt know what was wrong with it. Update did not work.

While driving at 70–75 mph on an interstate, my vehicle suddenly displayed a “Brake Failure” warning and limited speed to 62 mph. Power steering failed completely, and braking became ineffective despite hard pedal pressure. Multiple warnings followed: ABS, engine, and others. I was in heavy traffic with vehicles at full speed. Loss of braking and steering control forced me to coast across lanes to the shoulder, narrowly avoiding collision. My safety and that of others was at extreme risk. After stopping, I turned the vehicle off for ~30 seconds. Upon restart, all systems returned to normal—no warnings or issues. This indicates a transient software malfunction, not mechanical failure. No prior warnings or symptoms occurred. The problem has not been reproduced or confirmed by a dealer/service center. I have not scanned or inspected the vehicle. It has not been examined by the manufacturer, police, or insurance. The vehicle is in my possession and available for inspection upon request.

While driving at 70–75 mph on an interstate, my vehicle suddenly displayed a “Brake Failure” warning and limited speed to 62 mph. Power steering failed completely, and braking became ineffective despite hard pedal pressure. Multiple warnings followed: ABS, engine, and others. I was in heavy traffic with vehicles at full speed. Loss of braking and steering control forced me to coast across lanes to the shoulder, narrowly avoiding collision. My safety and that of others was at extreme risk. After stopping, I turned the vehicle off for ~30 seconds. Upon restart, all systems returned to normal—no warnings or issues. This indicates a transient software malfunction, not mechanical failure. No prior warnings or symptoms occurred. The problem has not been reproduced or confirmed by a dealer/service center. I have not scanned or inspected the vehicle. It has not been examined by the manufacturer, police, or insurance. The vehicle is in my possession and available for inspection upon request.

Upper Radiator hose O ring defect Causing all 2023+ Chevorlet Colorados and 2023+ GMC to leak coolant in a brand new truck

After each rain or hand car washing, the OEM sunroof has a gurgling sound when driving at speeds above 25 mph. This does not clear for miles, or over time (at least 1 day without water). Water appears to be passing through the seal into the drainage gutter, but not completely draining out through the drains. Its been in service twice to have the drain lines cleared, and the issue remains. This has been present on other car manufacturers as a "wind pressure issue" where the force of driving causes wind pressure to push what water hasn't drained back up into the sunroof. Fix was extending the drain lines at output. GMC unable to repair.

The contact owns a 2023 GMC Canyon. The contact stated that while driving 20 MPH, the vehicle came to an abrupt stop without warning. The contact waited for several minutes before resuming normal driving. The contact stated that the failure was caused by the rear brakes. The vehicle was not diagnosed or repaired. Neither the manufacturer nor the dealer was notified of the failure. The failure mileage was 14,129.