I have a 2000 GMC Yukon denali where is the

not sure if you did all these steps but maybe it'll help....

https://northcoastkeyless.com/2003-gmc-yukon-denali-keyless-entry-remote-programming-instructions/

I suggest visit this lonk to download 2000 GMC Yukon Denali. Owner's Manual or in this other 2000 GMC Yukon Owners Manual

Hope helps.

Close all the vehicle doors.
Insert the ignition key into the ignition lock cylinder.
Press and hold the DOOR unlock switch.
While holding the DOOR lock switch in the unlock position, cycle the ignition ON, OFF, ON, OFF.
Release the DOOR unlock switch. The doors will lock and unlock to confirm the program mode.
Press and hold the LOCK button and the UNLOCK button simultaneously on one keyless remote. After a delay of approximately 15 seconds , the doors will lock and unlock to confirm the programming of that transmitter.
Repeat the previous step to program up to four transmitters.
Turn the ignition switch to the RUN (one more click forward) position in order to exit the keyless entry transmitter mode.
Operate the transmitter functions in order to verify correct system operation

Disrupting the power supply triggers the antitheft system, and even though everything is back the way it should be, one the system is triggered there's no way to undo it. The only option vehicle owners have had for a long time is to take it to a dealership where they will have to replace the module, or sensor, replace the ignition switch and key. The average cost for these three parts plus labor is $1,000.00+. There is san alternative fix that is considerably cheaper. Link to this website for information on the only working bypass system on the market: http://newrockies.ca/vatsbypass.

my remote start ont work but door locks work 2007 buick

Check the buttons.. I have an 06 Grand Prix with the Remote starter on the top and it seems that the conductor on the buttons worn out.. Take the keyfob apart, pull the rubber buttons off the chip, lick your finger and touch the place where the unlock (right side of the fob) would be. That should unlock your doors. I just did it with mine. I would just buy another fob on ebay and change the buttons out.. Hope this works

change battery in your remote.

it may start but if it does it will not stay running. you are asking for issues.

yes it does sound like that is your problem. try checking for used one.

on the ecu behind and below the dash