I'm looking for some help with these codes. I have 2006 GT with 86000 miles and have been having some issues with what I thought was the engine misfiring. The check engine light came on. A buddy read the code and it was P0716. He reset the light and it stayed out. The misfiring came back and the light stayed on for a few days. Took it to ht edealership and they are telling me its an internal trans issue. Is this accurate? ASny sugeestions on what to do?