I should have clarified it a little better. I have a 15 Denali with a 6.2 and 8 speed. The truck is a Beast. If the transmission could be tuned to shift better this thing could easily run mid 13's with the right stickey tires. I ran a 9.2 in the 1/8 stock with a ton of wheel spin. And it gets about ...

It will work but if you have an 8 speed trans it won't work. Eventually someone will figure out how to tune the 8 speed with a hand held.

If they look into it enough they will find it has been messed with. I don't care what anyone says. Most of the time they don't dig that deep unless it has problems.

I sold mine in less than 4 weeks. Diablo couldn't figure out what was wrong with my InTune for my 2015 Denali. They haven't got the trans part of the tune setup. I went back and forth with some techs and they didn't know why it wouldn't work. Sold it to a buddy with a 2006 SS Silverado and it works ...

Yes I put it back to stock. I hooked it back to the home computer it said this tuner is up to date. Took it back out put it on the truck and it said PCM Calibration may need an update. If I push red x it tries to read again green check it tries to read again. Always comes back to the same screen ...

Truck went in Thursday for a TCM recall for TQ Converter shudder. Now the intune does not work at all. Stays on the screen trying to find the PCM. Won't do anything else. Anyone know how to fix this

Took mine in to the dealer today. TCM retune. It was for the TQ Converter shudder. I also have a recall for the prop shaft u joint bolts out of index. Go figure. Brand New 2015 Denali with 6.2 n 8speed

Ok Thanks for your Help it's Greatly Appreciated.

So that means I can't take the speed limiter out, TQ Man, or do any transmission related parameters?

Can't get my Intune to work. I have a 2015 Denali 1500 with a 6.2. Says it can't read the TCM. Any help would be appreciated.