Transmission completely rebuilt, ecm/pcm module replaced.. Unit works correctly while cold,after warm up unit stops shifting stays in 2 gear. Relays replaced. What is wrong?

 

2010 3.8L 62te transmission completely rebuilt, and ecm/pcm replaced with oem parts. While van cold shifts correctly, when warms up goes into limp mode. This is what it was doing before it was rebuilt, also replaced relay pack. What have they missed?

 

Fluid was changed with rebuild. I had transmission rebuilt because shop said was necessary, changed relay pack. With all this new should not have same problem. Mechanic traced wires through harness. Could totally integrated power module be the culprit?

 

I have not received an answer. Are these generic answers what I am to expect?

 

Is there somewhere else I can go for help on line?

 

Take it back to the shop that rebuilt it and explain the situation to them.