Valvetronic codes

[Cody4130]

I’m getting the following codes, read the long post below for details. My question is has anyone had these and what was the solution?

2A69 Valvetronic actuator motor power supply
2A6A DME internal Fault
2A6B Valvetronic power limitation.


During my long process of a build I finally got to drive my car a long distance.
When I re-powered my 2008 4.8i I got all the random codes expected with power disconnection. I cleared them and did the valavetronic stops relearn. Car relearned them fine. Fast forward through my power steering snafu and I finally got the car aligned and 100% ready to put miles on.
Decided since it was a nice day I took the “long” way home from work. Drove 106 faultless miles, car had plenty of power, 0 misfires, snappy shifts and shockingly good performance for a vehicle of this vintage. Pulled in the garage feeling great looking forward to my next drive.
Start the car up the next morning to go to work and I get the half engine light and limp mode. Check the codes and figure it could be some adaptations taking place and maybe they will go away. Pulled out with my scan tool reading data and accelerated to the 55mph speed limit without issue then the power got less and less until around a mile later I could barely do 20mph with the pedal floored. During this time I had no misfires, engine still ran smooth, I heard no uncouth mechanical noises. My scan tool indicated 100% throttle position. So I don’t think it’s the well documented throttle body wiring issue.
I am leaning towards an eccentric shaft sensor or some wiring therein. Is there anyone that knows how to test it without cracking open my freshly rebuilt, leak free valve cover?