This is for my dads 2004 5.7L 4x4 SLT.


I noticed this problem when I borrowed his truck last week to go to Toronto, but first I feel I should mention, his truck is in amazing shape, and runs almost like new.

When I first noticed this, we had been travelling with cruise control on for a good 45 mins at least, then suddenly cruise control switches off, and would not reactivate.

after I shut the truck off when we were grabbing food, cruise would activate again for about 5 mins until we actually took off.

At this point if you turn cruise on, it will shut off just after driving away and won't reactivate until you turn the truck off and back on again.

I think I hear a click when it shuts off but I can't be certain because the seat makes a similar noise (something loose perhaps).

So, given those symptoms, has anyone experienced this or know what would cause this problem?

 

I believe it is driven by the tone ring in the front left hub. Check the connection/wire condition

 

what is a tone ring?? I just looked through a service manual and I still can't figure out what it is, or where it is.

 

Its located inside the bearing hub and creates a pulse as the windows pass the face of the sensor---more pulses, faster vehicle speed, but in this case, its used for the cruise control.
There are other tone rings in the vehicle. You might do better googling it

 

Mine was doing the exact samething. It was the brake light switch behind the brake pedal. I replaced it and no problems since. That was 2 years ago