Aside from what has been previously suggested we had the same problem a few years back, it was also my introduction to the auto park system. I put my 1996 Rexhall with a p-30 something chassis into reverse went a few feet and stopped hard. I am screaming at my brother-in law out the drivers window as I am sure he backed me into something. There was nothing behind me. Shifted to driver pulled forward no problem. Tried reverse same problem. Again no experience with auto park took MH to commercial truck replace in the desert. Could not duplicate problem once there. They said sounded like transmission spent $1500.00 service repair etc. They found no cause for problems I described. Turns out they knew nothing about the auto park either. Went to Las Vegas a couple day later problem started again. Found a rv repair garage he knew what the problem was. This time I was educated about this system. and after his inspection and no charge for his time we were on our way. The problem is the switch on the steering column that is operated when you shift from park to fwd/rev. It needs adjustment. To this day not done because of high labor estimates associated with this. I know to listen for brake pump cycling and know when brake system is disengaged. Best advice find some one familiar with the auto park system.
