NHTSA Complaint #11712664 — 2022 GMC CANYON

I have been dealing with a sweet/Christmas-like smell in my car occasionally for the last several months. This is a health & safety concern for me involving ethylene glycol fumes in the cabin. These fumes could be linked to why I have experienced increased sinus headaches over the past several month. I took it into CarMax (where I purchased the vehicle) and they were able to diagnose the issue and state that my heater core needed to be replaced. However, since my vehicle was under 36,000 miles, it needed to go to the dealer. The dealer that has been working on the vehicle is Hendrick Hoover Chevrolet. I have taken the vehicle to the dealer twice already and they have not been able to diagnose it the same as CarMax nor recreate the smell. Both times I have picked up the vehicle, I smelled the same thing within 1 day of having the vehicle back. Today (1/22/26) I took the vehicle back to CarMax to have them take it to the dealer for the THIRD because I have not only smelled the same smell, I have 2 new issues that need to be addressed. They are not the reason for this complaint, however. But for documentation purposes, it involves servicing the safety restraint system and error codes P0018 and P0021. I do not have any records of the first time I took the vehicle to CarMax/Dealer in November of 2025, but I have attached the records from the latest visit where I dropped the vehicle off on 12/10/25 and picked it up on 1/14/26.