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Your dealership should have seen any underlying codes. Most Cruise controls I've worked on are used on the vehicles vacuum. that is where i would start, because on a grade your engine uses more vacuum pressure thus taking from some where else.
Cruise control fuse is 10 Amp, located in the interior - left side of the instrument panel (dashboard). An automotive 10 Amp fuse will be red in color.
{: ) Check the fuses at the I/P fuseblock labelled CRUISE(10amp) and STOP(15amp). Also check the the ETC/ECM fuse(15amp) at the underhood fuseblock. A faulty brakepedal switch is most likely the cause. The cruise control system will not function properly if this switch is giving inaccurate voltage signals.
It is not a resistance problem. As it operates normally, the cruise control is wired to the stop lamps and will operate only when it sees chassis ground through the stop lamps. When you tap your brake pedal, 12 volts is applied, the ground goes away and cruise is deactivated. Because the LED tails are diodes and only let current flow one way, the cruise cannot see ground and will not set or operate. The same symtoms would appear if you had original incandescent tail lamps and both brake lights were burned out.
The solution will be finding the wire from the cruise that senses the brake lights, and connecting it directly to the brake switch, IF the brake switch is grounded when the pedal is not pressed. You may have a relay wired to the brake pedal switch to make this happen. Seek a knowledeable car audio/accesory shop familiar with auto electrical to help you with this.
Good luck!
there are a few causes for this to happen
I just put a fuel pump in yesterday in a 04 yokon XL with the same issue
it had a plugged fuel filter, and low fuel pressure.
Same complaint, coming from CA to TX, freeway speed cruise on and it just dies.
The vehilce needs to be looked at, and have vehilce scanned for codes.
ed7882 I had the same exact problem and thought it was a fuse or the wiring. Come to find out it was just a blown bulb. They are inline together with the cruise so if one blows it all goes. So change out the lights and that should fix it for you.
Check your brake light switch at the pedal. This controls the lights and disengages the cruise when stopping. I'd look there before I go anywhere else. There may just be a wire loose. Could be a simple fix.
Check your bulbs first, I have lost both headlights on my ford at once on account of the bulbs burning out at the same time. Same thing probably happen, you have one filament out. The lights can work, but if the filament for brake is burnt, you don't see brake lights.
As for the cruise control. Check fuse box first. If OK check vacuum hose to actuator in engine compartment for starters.
Advise:
There are a few things that can cause it. One which may sound stupid is actually valid on a lot of cars - if you have a burned out brake light bulb, some cars will not allow the cruise to be set. Make sure all of your bulbs are working right.
You could also have a failure of the cruise control buttons. On my Audi, the cruise control is on a stalk on the column, and is known to overheat and fail. A search of the internet should reveal if this is a known issue on your model year Yukon. Search "cruise control failure Yukon" and see if something comes up - chances are there is information out there that will tell you if this is something that is typical of your vehicle.
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