Phantom breaking. 2024 GMC Canyon AT4

pinebaron · Oct 3, 2025

Dave24canyon said:
I am having the same problem. Purchased my 24 canyon AT4 a year ago and problem appeared within a month of purchase. It has been in shop at least 6 times now. They have reloaded the software multiple times and replaced the windshield camera. Problem still exists. Recently did a 8 hour trip to another city. On way to destination the problem appeared 7 times. On way home it appeared 16 times. It’s always the same thing, the green vehicle icon appears then my truck breaks slowing between 2 and 15 kph the green icon goes out and truck accelerates back to cruising speed. The most recent incidents were where my truck did the break then accelerate 4 time in rapid succession. A couple of them were scary incidents in that driver behind me was not expecting me to break on a highway when no other vehicles were in sight. I’m told GM Canada has been engaged but still no solution. They better find the issue fast before one of us become a fatality because of this issue. I do a lot of highway driving and the adaptive cruise was a key option for me. Getting very frustrated!

Are you experiencing the issue with adaptive cruise on?

Dave24canyon · Oct 3, 2025

pinebaron said:
on

Yes the breaking only happens when adaptive cruise is on. I was told by dealer to only use regular cruise while they investigated the problem. During that time with regular cruise set I just happened to glance down and noticed that the green vehicle icon came on briefly then went away. There were no vehicles anywhere near me. Makes me think my truck thinks there is a vehicle in front of me even in regular cruise mode but it isn’t programmed to brake so it doesn’t. Something has to be faulty with the mechanism that is supposed to sense vehicles in front of me. It was purely by chance that I noticed the icon using regular cruise