I drove to a friend's house today, cruise was working fine. 5 minutes later i was leaving my friend's and doing about 67mph and cruise would not kick in. it was on and the light said CRUISE on the dash but i kept trying to set it and i'd let go of the gas and it would just start to slow down, nothing would make it work. i tried about 3 times. the check engine light is on also but for a different reason-O2 sensor or vacuum leak not sure yet which. but the cruise had been working the whole time it's been on except for today. any ideas?

 

Mine did this one time. I took mine to the dealer, I had other problems as well, but I can't remember what exactly it was. It was nothing major though. Check your fuses.

 

I had this issue on my 04 and it turned out to be the brake switch under the dash. I notice that my brake lights were on all the time. You can get a replacement from you local parts store for under $20 and install it yourself. Good luck.

 

my buddy has an o4 ram and his cruise control doesnt work either youll be driving down the road and itll just shut off. I didnt think about that switch until you mentioned it quadzilla. another problem he has been having is his taillights flickering on and off so maybe replacing that switch is a way to kill two birds wth one stone.

 

Had this with my 05', do a quick check for codes, I had a p2222 or something like that which was a speed sensor or something of that nature. I would clear the code and the cruise control would work fine but the second the code came back it stop working again. I dont really know how I fixed it exactly, but I had to take it down to get the brakes fixed at a shop down the road from us and since then the code has not popped back up and the cruise control works fine...

 

mine had a code like that probly about a month after I bought it and the cruise control woudnt work, I dunno what they did at the dealer, but its worked ever since.

 

how do you check codes?

 

Turn your key on and off 3 times (I think its 3) repeatedly but dont start the truck and you'll hear a beep like when you are driving without a seat belt on. If your truck has a problem a code should pop up where your odometer is in the dash. If it doesn't it'll just say done and go back to the odometer reading.

 

yup, just turn the key on-off-on-off-on and then the code will apear in the odometer reading

 

whats the brake switch? where under the dash is it? pics anyone???