2007 Saturn Ion 3 with 2.2 liter engine.

Son was driving it. He said the check engine light came on, and there was a loss of power. I just read the codes:

P0121 – Throttle / Pedal Position Sensor / Switch A Circuit Range / Performance
P2135 – Throttle / Pedal Position Sensor / Switch A/B Voltage Correlation

So I did a little research. There is a throttle position sensor on the throttle body. Could this be the culprit? If so, I don’t think I can purchase just the sensor – I think I have to purchase a whole new throttle body.

A little more research shows there is an “accelerator pedal position sensor.” Is this a different sensor? Is it a sensor attached to the pedal?

 

Yes there is a sensor on the pedal. And yes the throttle body is replaced as a unit. If you replace the throttle body, you'll need to do a throttle position relearn. Doesn't take long. Just cycling the key a few times.
I wanna say those are actual pedal codes. But can't remember off hand.