Ryno81

Shouldn't the dealer have been able to see what the error was? or are they that incapable?

Hello all, first time posting, i searched and couldn't find the info I needed. Recently my 2021 Sierra 3500HD AT4 started showing errors/codes on the dash. I am getting a low coolant level error with no issue with the coolant level, I have a service trailer TPMS error without a trailer hooked up and never having the trailer tpms active, and a park assist error. Dealer says they are unable to see anything wrong other than maybe a park assist sensor in the rear. I changed the park assist on the left rear as they said and nothing changes. A few days ago my wife hit a Utah pothole and the TPMS activated for the truck, but nothing was wrong, and the warning went away after a few minutes. Has anyone had similar issues? The dealer wants $700 to change out the park assist sensors but it is an easy job to do yourself. This all happened within 2 months of going outside of bumper to bumper warranty, but drivetrain warranty is still intact. Any information is greatly appreciated!