P2135 - Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation.
I replaced the throttle body on my 2008 Aveo 5 speed, no power anything, at 51K miles a year ago and it cost $75. I replaces it at again at 55K 2 days ago and this one cost $50 (ebay auction-I was the only bidder).
It only takes 15 minuets to change once you have done it a few times. 1/4" racher wrench with a 3 or 4 " extension, three 10mm nuts, 1 10mm bolt, 1 wire connector, 2 small heater hose clamps (plires) and 2 air duct clamps (flat blade screw driver). I re-used the old red "O" ring at the base plate.
I am getting 37 MPG on the car but I drive very conservatively.