It's unfortunate, but the auto in these cars is related to the extreme failure prone CD4E.
What is the condition of the transmission fluid - what is the color? How many times has it been changed?
It's possible the solenoids are bad.
Originally Posted by Red Jay 918
this is your chance to find the 4 speed auto out of an 09-10 SES coupe. shorter final drive = quicker acceleration
The computer would have to be reprogrammed, otherwise he'll get a CEL code for incorrect gear ratio. They're picky.