Car want shift out of first gear

Hi everyone my name is Joe and I have a 2005 Malibu with an intermittent
problem with the transmission shift out of first gear. I had it repaired and
the mechanic said it was the computer and reprogrammed it. Car worked
great for 2 weeks then started over with the same problem. My check
engine light is on and the traction control is off. It want let me turn the
traction control back on. I took it to a mechanic who put it on the computer.
He said the computer from the transmission and the traction control were
not talking to his computer. He said it might be a fuse or something simple.
Any ideas which fuses I can check to see if I can resolve the problem?
Thanks for your help in advance.