prorang97

if this fits a 2021, I’ll buy it. Message me.

Does it fit a 2021. If so, I’ll buy it. Message me!

Will it fit a 2021? If so, I’ll take it!

Ok fellas figured it out. Put the truck back to stock settings and the dealer was able to recalibrate it back to factory settings and the ACC worked briefly. It only worked on low speeds. Once I got up to highway speed, all the warning lights came back on and the ACC turned off. However when I turned the truck off and back on, the lights went away and the ACC would work again at low speeds. Went back to the dealer furiously.... hooked it up to their computer and it threw a code related to the Speedo. The code was said the MPH was off over 9 MPH which is more than the allowable threshold. That is why the ACC would only work in slow speeds. Then I got to thinking, not sure if you guys did a gear change, but I did. Went up to 4.10’s. I have a Edge CTS2 tuner. So I went in today and changed the gear ratio, but not the tire size. Now everything works with no issues. The Speedo is off about 3-4 MPH. So in the end, if you guys play with the gear ratio adjust in your tuners, you can get your Speedo close to actual speeds.

Thanks to the both you on the info. I put the factory settings back on the Speedo. I was using and edge tuner. Just dropped the truck at the dealer and hopefully they can recalibrate it after they messed it up the first time. I’ll let you guys know the outcome. Any word on using an inline Speedo calibration tool to fix the issue?

Awesome guys. I’m going to put mine back to stock through the programmer and take it back to the dealer and have them recalibrate the computer. I have an open case with GM about the issue so this will help them as well

Any luck with getting the cruise control to work? I put an 8 inch kit on my 2017 Yukon xl Denali and took it to the dealer. They can’t do anything. They tried to recalibrate but no luck