I have a 2006 Chevy Impala that I have replaced the throttle body position sensor on twice. The first replacement was April 2014, and the second replacement was December 2014. It was replaced because the code P2135: TPS A-B correlation came up, along with symptoms. After the replacement there was no code or symptoms for around 6 months. The code has returned again for a third time, this past week. I really don't think that the throttle body position sensor could have gone bad again. Are there any underlying issues that could be causing that code, or the throttle body position sensor to go bad?

 

This is just in general terms, as I have don't know of anything about a 2006 impala:

Is your throttle blade closing properly? have you cleaned it b4 with throttle body cleaner, and the surrounding cavity?

Is it binding at all?