buc1980 wrote:
First you don't suppose to set the cruse control going downhill with the trailer behind.You suppose to use the tow mode and watch the speed and the RPM gauge and pressing on the brake to slow the truck down.Diesel engine don't like high RPM.I think that the computer throw a code because of the high RPM.
You may want to do a little reading. Diesel engines in the big 3 all use high RPM's to control speed with the Exhaust brakes. I run my RAM as high as 3K, the ford and GM's can run even higher for the best braking.
Also using the cruise control on downhill grades is a VERY safe and effective way to control speed.
