Never had new vehicle that the cruise control did not work. Going to try and have fixed tomorrow. Will update. Whole radio system crashed with less than a 1,000 miles. Seems to been a problem for awhile on makes of this truck. See what the dealer will do.

Update from Mar 16, 2016: took to dealer for a second time because cruise stopped working again. told dealer about wire harness issue I found here. took over a day to fix, but put new wire harness. Seemed to fix problem. We will see.

The cruise control will not hold when going downhill and has never held. I have brought the vehicle to three different Dodge Ram dealers and none have been able to fix the problem. The maintenance staff where I bought the truck (Naples, FL) said that cruise control is not supposed to hold when going down hill!! You are supposed to always apply the brake. I thought the guy was ill prepared for in every other vehicles that I have owned, including two ford trucks and all my cars, cruise control holds when going down hill. I called Ram support, indicated the problem, and they assured me that the cruise control should hold going down hill. But no one has been able to fix the problem.

I have a second home in Ellijay, Georgia where there are plenty of hills. I brought the truck to a Ram dealer in Blue Ridge. They test drove the truck, and agreed that the cruise control does not hold when going down hill. However, they had no fix. They talked to the mechanics at the Ram plant, and they had no solution.

Accordingly, in hilly country I do not use cruise control because on a steep hill the vehicle will quickly exceed my setting by as much as 15 mph. It is dangerous. Furthermore I want to avoid getting a speeding ticket.