My regular mechanic couldn't even get the TCM to communicate with him, so I had the RV towed to an authorized Allison repair shop. The error code was stored, and they removed the TCM and "tested it on the bench." Prior to that, it sounds like they did check for loose/dirty connections, etc. My biggest worry is that because they couldn't come up with an answer as to what caused the TCM to fail, will I be replacing it again in the near future? There's nothing worse than fixing a problem, but not knowing how to prevent the problem from re-occurring.
