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Jb3551 · 11-03-2022, 12:12 PM

I came to a stoplight and when I continued moving forward all of a sudden the bus just start creeping and wouldn't go any faster than a creep. I noticed that the lights for the transmission we're not on. I came to a stop I shut it off and it would not start up again. It acts as if it's stuck in drive.

Jon_C · 11-03-2022, 12:52 PM

Sounds like blown fuse on power to transmission TCM. Do you know if its an allison MD transmission? If so the fuse is in the vim (vehicle interface module) which is a small metal box usually in bay near driver

jacwjames · 11-03-2022, 01:15 PM

We had a no light/no start issue with out 3000 transmission and in the end they replaced the TCM. Cost was ~$3500, I know there are places that you can send you TCM to for repair for a lot less money but unfortunately I was headed out of country and my wife had a trip planned. Had to have it towed to an Allison shop, they diagnosed the TCM and replaced it.

Freedom Road · 11-07-2022, 08:41 PM

Quote:

Originally Posted by Jb3551

I came to a stoplight and when I continued moving forward all of a sudden the bus just start creeping and wouldn't go any faster than a creep. I noticed that the lights for the transmission we're not on. I came to a stop I shut it off and it would not start up again. It acts as if it's stuck in drive.

Check your engine and trans codes and call Tiffin with them to troubleshoot fault. I had similar acting issues with a faulty collision avoidance short to ground. Tiffin helped me isolate correct connector and after disconnecting it coach fired right up. FYI- Allison expert had no clue since after tow it started with no ground and no codes. This was an intermittent short but it got us stranded twice in one year. Good luck