Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
The first thing I'd be looking at is trouble codes.... is the check engine light on?
And the next thing I'd be looking at is whether there is power on the pink wire going to the transmission connector on the passenger side. It sounds like you have no power to the transmission, and it's in limp mode. But, there should be trouble codes to go along with this.