jhplak325

You are still going to need a wire harness for 2016+ HiD headlights in a 2015.

Unless something changed, parking brake is mechanical.

Dots come up in the windshield if you come up on something to fast. mirrors will power fold in when you press and hold the lock button on the remote. Will fold out when you press and hold the unlock button on the remote.

Look in the glovebox for RPO AVF, if you have this, then truck was built after August 14, 2014. With this RPO, you need harnesses. Without this RPO, you need harnesses and a jumper harness.

All 2001-2019 trucks with Duramax has 3.73 from factory. 2020’s will have 3.42 with the 10 speed Allison.

You have 2 years or 24 months from in service date to use the 2 free oil changes. This will include oil change, oil filter, tire rotation and fill DEF on diesels. Everything else you pay for. https://www.gmc.com/gmc-life/how-to/scheduled-maintenance

GM did not offer factory TBC on the GMT800 trucks, they included a pigtail harness to wire in an aftermarket controller. You also had to install a fuse and hookup wires in the underhood fuse box.

It is plug and play. When you plug it in, it will ask you vehicle make and that’s it. also, head over to www.duramaxforum.com and ask your question in the LML section

If you can get your hands on an Edge Insight CTS2, then you can run a manual regen.

My 15.5 DenaliHD does not show Driver 1 or 2 and memory seat function works fine.

Check the trailer brake wiring on the trailer and check the brakes. Also, what brand plug did you put on the trailer? GM has a TSB about this and they recommend using a Pollak trailer plug.

14, 15 and a handful of 16’s do not have CarPlay from factory.

Check all the fuses before taking the dash apart. When you turn the key to the run position before starting, does the check engine light come on?

Mine happened less than a month after buying the truck and was replaced under warranty and that was about 4 years ago. you would need the painted one since you have a Denali.

Mine did the same as yours and it was the OnStar/XM antenna.