This past week I towed my 10,000 pound travel trailer up the mountain from 5300 feet where I live to 10,000 feet. My Ram is a 2500 Diesel 4X4 equipped with the tow package and the 6 speed transmission. Going up the hill was great, and on a previous trip, coming down the hill was fine, too. On this trip down, I had the console set to "tow/haul mode," the air brake was set to automatic and prior to coming down the hill I set the ERS (electronic range selector) to no higher than 4th gear, since the speed limit is 45 most of the way down the hill. About halfway down the mountain there is an "S" turn where the speed limit drops to 25 mph, so I shifted the system down to gear 2. After I went through the turn, I attempted to shift back to gear 4 as the top gear and the ERS would not respond. I finally got to a spot where I could shift over to the normal "Drive" mode and continued down the hill without a problem.
I am one of those people who read the manual cover to cover when I got the truck, and have checked it again to see if I did something wrong. I can't find anything that indicates I should not have done what I did. The truck ran normally following this incident.
Has anyone else experienced this type of issue or have a solution? I attribute this to a software issue, but perhaps its something else. Any suggestions would be appreciated. Thank you.