"Stability Sys Disabled" and "Engine Power Reduced"

[Yukon Lover]

How did you figure out that it was the throttle body? Im finding that i have a voltage issue when i try to test the sensors its way off. What controls the voltage to your sensors with just the key on not running? The pcm?

 

[NotJLB]

I replaced the throttle body with an OEM one, and replaced the throttle pedal sensor when it started doing this crap a years ago. Now I'm getting the same to codes again, and can't do anything about it. I can't even erase the codes. The Beast is stranded in the driveway.

I'm not in the mood to f around with something that's stupid to begin with, and has not logical fix.

Just knowing what's causing would be nice.
It could a couple dozen things:

https://www.carparts.com/blog/what-triggers-reduced-engine-power/