2021 Chevrolet Colorado

My 2021 Chevy Colorado experienced a distinct bucking and shuddering sensation under slow acceleration at lower RPMs, specifically when shifting between 2nd and 3rd gear. There were no dashboard warning lights or malfunction codes prior to the issue. The defect was officially reproduced, inspected, and confirmed by a GM technician at a certified Chevrolet dealership on October 28, 2025, at 46,437 miles. Diagnostic scanning using GM’s GDS software explicitly confirmed that the Torque Converter Clutch (TCC) slip speed was exceeding 100 RPM when the low-speed shudder occurred. The dealership determined the component was failing and replaced the entire torque converter assembly under warranty. This documentation is submitted to prove that the TCC defect remains uncorrected in post-2019 vehicles. My sister’s identical 2021 Colorado is now experiencing the same defect at 59,000 miles, but her symptoms have progressed significantly worse to include a severe high-speed drivetrain shudder alongside the low-speed acceleration bucking.

The contact owns a 2021 Chevrolet Colorado. The contact stated that while driving approximately 75 MPH, the engine revved without the accelerator pedal being depressed. The contact stated that while turning onto an exit ramp, the brake pedal was depressed to slow the vehicle; however, there was resistance to the brake pedal, and an excessive amount of pressure was needed to depress brake pedal to stop the vehicle. There were no warning lights illuminated. The vehicle was not taken to be diagnosed or repaired. The dealer was informed of the failure. The dealer informed the contact that failure might cause the complete engine failure. The manufacturer was not made aware of the failure. The failure mileage was approximately 106,000.

We bought this truck from a dealer (used) and before delivery the driver seat belt recall was repaired as it was still open. Now, months later, the airbag light is on with a warning and it appears that the airbags are disabled. This started as an intermittent issue and now remains constant. Not only does the warning chime when the truck is started, it will chime at random while driving which is a distraction and a significant safety concern for our young adult driver. Our local Chevy dealer will not assess the issue for less than $300. Our mechanic told us that replacing the airbag is a minimum of $800 depending on the extent of the work. Given the prior airbag recalls impacting Chevy/GMC, I thought this is important to report in case others are seeing airbag warning issues in a more widespread issue. As airbags are such a large part of automotive safety these days, I truly believe that these issues should be checked out at no cost to the consumer. Airbags should not be something that breaks down with normal wear and tear and should be a longstanding safety feature of the vehicle. Malfunction is likely a defect, not a result of normal use.

While driving downhill nearing a stop sign my wife went to apply the brakes to stop and all she had was an extremely hard brake pedal. She panicked that she “no brakes.” She was only going about 20 MPH, and was able to stop the vehicle but it took an extraordinary amount of effort to do so. Had she had to make a sudden stop for a child, another person, or something else, she would not have been able to stop without negative consequences including possible death. There were no warning signs, vehicle pulled out of driveway and brakes were normal. Less than 10 seconds later no more power brakes. The vehicle had the vacuum pump seize which eliminated the power boost and the pump is operated by the exhaust camshaft which also got damaged and needs replaced. Chevy dealership estimated the repair at $2,600. Upon researching the vacuum pump, this is a common failure on multiple GM vehicles resulting in sudden brake loss. The vacuum pump should have been designed with a shear pin, so that if it fails the camshaft does not get damaged. Had the vacuum pump been properly designed and it was the only failing part, the repair cost would be $500 versus $2,600. Also, there should have been a temporary backup system so you would not lose power boost.

While driving on the parkway, the engine revved, and then the brakes became hard as a brick. The truck was unable to be stopped. There were no warning lamps or indications there was a problem, it happened suddenly and immediately. Other drivers' and my own safety was at risk because I could not stop the truck. Here is the diagnosis from the GM service center where it was towed to: "After the removal of the valve cover, the tech found the pump in pieces, and the end of the exhaust camshaft was damaged, as presented in the photos. The quote attached depicts all that is being replaced with this repair." The is a know and acknowledged GM defect that has affected well over 3 million vehicles to date. There was a recall issued for some models, but not the Chevrolet Colorado. There are many reports online of other Colorado owners having the exact brake vacuum pump failure, resulting in damage to the camshaft.There is also a class action lawsuit filed in Michigan in early 2026, involving the same brake vacuum pump failure, for some of the models that were not included in the recall. This is an extremely dangerous mechanical failure that GM is aware of.

The contact owns a 2021 Chevrolet Colorado. The contact stated that while driving at 30 MPH, the check engine warning light illuminated. A dealer was contacted. The vehicle was taken to the dealer, where it was diagnosed, and it was determined that the camshaft actuator valve needed to be replaced. The vehicle was not repaired. The contact associated the failure with Special Coverage Program: N232430470 (Camshaft Position Actuator Valve Solenoid - Bank 2 (Left Side) Exhaust ); however, the VIN was not included in the program. The manufacturer was notified of the failure and informed the contact to call the NHTSA Hotline for assistance. The failure mileage was 43,500.