My check engine light recently came on and upon checking the codes manually it brought up two codes. The first one is for the Auto Transmission Control Unit Signal to ECU and the second is for the vehicle speed sensor. The speed sensor code is nothing new someone told me it was because i have 18's on my car. But i'm not sure what the other code is about because the gears have been shifting funny lately.

 

Get the codes and check the stickies for a solution.