Join Date: Oct 2011
Location: Magnetic Hill, New-Brunswick
P2135 Throttle Position (TP) Sensor 1-2 Correlation ECM
They are very related. I believe on the Cobalt the throttle position sensor is built into the throttle body itself. You could try cleaning the connectors contacts but chances are you will need a new throttle body. Most can be swapped without a relearn provide the keys are in you pockets and not in the ignition when you do so.
Never drive faster than your guardian angel can fly