2026 GMC Canyon problems

“I’ve included all my repair orders regarding to coolant smell/leak and transmission shutter. I purchased my truck on XXX. We had planned a family vacation to [XXX], and we were driving up when I felt the transmission shutter at around 3:00 to 5:00 p.m. while cruising at approximately 55 to 62 mph. Since then, I’ve noticed it happening more frequently. I took the truck to GMC dealer Jack Hanaia at [XXX] (I believe it was in XXX). I expressed my concerns, and they couldn’t find any issues with the transmission, along with the coolant leak. They claimed they couldn’t find a leak, but the service advisor could smell a strong coolant leak. Later on March 5th the coolant leaked, and I got a different advisor. She could smell the leak but the tech couldn’t replicate the issue. A few months later, around August, I took the truck to a different dealership, the Buick GMC dealership at [XXX]. I informed them that I had a coolant leak smell, a transmission shutter, and other issues listed on the repair order They couldn’t find the transmission problem or the coolant leak, but the advisor could also smell the coolant leak. I’m getting tired of going to the dealership and…”

“Intermediate steering column defect causing a pronounced dashboard rattle. The dealer (Putnam GMC, Burlingame, CA) diagnosed the issue under warranty, but the required part is on national backorder with no ship date. The vehicle has been out of service at the dealership since September 2, 2026 awaiting the part. This is a steering-related defect on a brand-new vehicle with approximately 1,500 miles.”

“The contact owns a 2026 GMC Canyon. The contact stated that while his son was driving approximately 30 MPH, the passenger’s side rear brakes were making an abnormal crunching sound. No warning lights were illuminated. The local dealer was contacted, but the vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 100.”

“GM pushed a system update to my truck last week. I noticed the front bumper sensors are no longer working. In addition, the auto start-stop function no longer works.”

“when apply GM update V661.10. tire pressure sensors are wipe out. resulting in 4 flat tire being indicated on the display. GM has no answers for this. this is a safety system that should not be disabled”