Hey guys, Throttle real eratic and cruise control won't work along with check engine light. Ran the scan and came up with P2121 & P2122.
P2121 APPS Conformance Error
P2122 Throttle/Pedal Position Sensor/Switch D Circuit Low Input

Anybody has any idea's? Throttle position sensor maybe?

 

Bad TPS

http://www.dodgecumminsapps.com/index.html might have one but in 04 1/2 yours might be on the foot feed. Not sure of a "good deal" place for that one.

There has been a bunch of these threads lately including mine.

https://www.dieseltruckresource.com/...highlight=apps

 

I had the same codes with different symptoms; dead pedal after cancelling the cruise control. Tried resetting the APPS but that only provided temporary relief. Replaced the TPS and that took care of the problem. The cost was about $500, including labor, at a local repair shop.