Ok pick my wife up from work, and the check engine light came on, then the trans started to shift firm, like i put a shift kit in. Could there be somethink wrong with the trans or the ecm that works the trans, the car only has 24,200 miles. It is an 06 lt3 with the 3.9. Any input would be great, TY.

 

places like Autozone will read those codes for free. see what the code is.