Is anything else loosing network connection? For instance the tach or radio?Has anyone experienced lost connection problems between their tcm and ecu? My truck is fine for 10-20 minutes, with no problems and no check engine light and then ill notice the speedometer, odometer and gear lights stop working. Speedometer reads 0mph, odometer never goes up and my truck says I'm in 1st gear when I'm parked, driving, etc. The truck also goes into safe mode so I feel like I can reach a max of 50mph and pedal to the floor it does not go fast at all. The code is U0101, but I'm trying to avoid a brand new tcm altogether considering they'll connect for the first part of my drive and then say they're not connected I don't think its gone completely bad. Any suggestions?
09 Colorado, I5
A TCM would actually be the first thing I try. You can get them used for very cheap and they do not need to be reprogrammed for your truck.