Have 04 cat eye replaced throttle body still have P0120 code also replaced pigtail along with pedal sensor still have code and reduced engine power any help or solution from prior experience

 

The P0120 DTC is telling you that there is a problem with the Throttle/Pedal Position Sensor Circuit 1. It does not tell you that the accelerator pedal sensor or pigtail is bad. You have to troubleshoot the entire circuit in order to determine what the problem is. Trouble Codes RARELY if ever says that a given part is bad. The trouble code tells you that something is wrong with a circuit or a system.

Try reading this for diagnostic information:

https://easyautodiagnostics.com/gm/4...sensor-tests-1

Good Luck!

 

GM Bulletin