I was driving up a hill pulling an empty trailer when all of a sudden my cruise control kicks out. I tried to re-engage it, only to have it turn back off half a second later. I kept trying and it did the same thing.

Once I stopped, loaded the trailer and headed back, I thought I'd try it again, and it worked. And it stayed on with no problems.

Does anyone know why this is?

 

I had this happen as well and it was a faulty wiring on the trailer.....

 

hmm ill let uhaul know

 

I have noticed in numerous cars and trucks of mine, that if you lose enough speed with cruise control on, it will disengage itself.
I haven't had it happen on my 08 f150, but i have an a few previous f150's.

 

What year truck do you have? Do you have the floor shifter? (I guess its more of a shifter between the seats). If you have the shifter between the seats, it is the park/neutral switch causing it.

At least thats what it was on my 04 F150 with the floor shifter. Works fine when cold, and would kick off with heat.

 

tell me more , im assuming you replaced the switch and it fixed the cc prob?

 

X2 was going to say the same thing myself.

 

Could be a faulty BOO, Shift Interlock Switch, or bad Steering wheel switches. Could also be a faulty radio....