I"m no expert. This is common problem with Dodge trans. I'm having a similair issue. Your van is in limp mode which it will not leave 2nd gear. This helps you to drive the instead of shutting down. Repairs need to be done.
The computer issue, did he mean the transmission (TCM)or engine computer. Usually its the TCM gone faulty. The speedo not working makes me suspect the trans output sensor.
Make sure your mechanic has read the TCM for fault codes reapir them first then go from there. The output sensor is an easy and cheap fix you may be able to do. Read other post about the sensors location
Be very werry if mechanic says, you need to rebuild tran.
Friday, December 18th, 2009 AT 7:17 PM