Would need to know year ,make an model vehicle to help ?
SOURCE: Cruise control
Bad relay. They are to the right of the fuses (fuses inside the car). You can see the relays if you open the cover to the fuses (they are big blue cubes), but will need to remove a few screws to remove the panel to get to them. I can't remember which one it is, it might make a clicking noise when you try and turn on the cruise. Or you can swap "matching relays - compare diagram on top" and see what else stop working. I had to replace several, my dash when out, my cruise, and I think one is the fan that blows your ac and heat.
SOURCE: 2003 expedition cruise control inoperative
I had this same Problem and it was a simple vaccuum hose leak connected to the cruise control module. Try replacing this small hose.
SOURCE: cruise control won't work, 10 amp. fuse in fuse box under hood ok
look at the other fuse box under the dash
SOURCE: 2003 expedition cruise control inoperative no
I'm having the same issue with mine. Just checked both fuses #5 and #12 under the dash, but both are fine. Can't find Relay #302 for the speed servo. 2003's aren't listed in the recall. Ugh!
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