Hi all, newbie here. We are stilllp
P learning about our new coach. We recently purchased a 2001 Marquis Amethyst with a 505 hp Cat C12 and a HD 4000 RV transmission. It recently started sifting into 1st gear when drive is selected, and refusing to up shift to 2nd. Once in first, it won’t return to neutral or reverse. We have to shift to neutral( it doesn’ t shift) and shut down the engine off. On restarting it will return to neutral and can be shifted to reverse( which works). Upon shifting to drive, it locks up all over again.
Our Mechanic has down loaded the transmission error codes, and saw a “transmission speed sensor” code, and
possibly an ABS code. Does my coach even have ABS ? He saw no other codes.
We have ordered a new speed sensor for the transmission. Has anyone else experienced this? Does it sound legitimate?
Would appreciate any helpful insight anyone can offer.
Thanks so much.
Mike Sulley