2024 Gmc At4 2024 Diesel Problems. Gm has issued a fix for the 2024 gmc sierra hd to correct a glitch in the electronic control module that can lead to incorrect data during emissions testing. My neighbor has the 2021 at4 with a little more miles on it and has had no.
After it opened it would continue to unlock every. Bought a 2024 gmc 2500hd at4 diesel, dealership ca see that the def level is empty, but the low sensor will not work, and they will not fix it because it won’t.