LS3 dead throttle (drive by wire)

[Yelcamino]

So yesterday I finally have everything attached and ready to go so I turn the key and the LS3 fires right up, rpm goes up for a second or two and then it settles down to a nice idle! Awesome! So I blip the throttle and nothing happens. I try again, still nothing.

Full disclosure - To get the pedal harness through the firewall without creating a huge hole, I cut the connector off. Once all the wires were through the firewall, I shortened the harness (it was about 3' too long) and reattached the connector. Simple enough, red to red, blue to blue, etc.
Because I have a Holley mid-ram intake, the throttle body harness was too short to reach. About two weeks ago I ordered a 12" extension from Lingenfelter thinking I would have it soon. I got tired of waiting so I spliced in wire to make the TB harness long enough to reach the TB. Again, simple enough, red to red, blue to blue, etc.

Naturally my first thoughts are I caused the issue, but after looking around online, a dead throttle pedal seems to happen occasionally. So I bought a scanner and I got two codes (but each one comes up three times).

P0107 – MAP or Baro circuit low input
P0641 – Sensor reference voltage “A” circuit/open

Would anyone happen to have a wire diagram showing what voltage should be on what pin for the throttle body and pedal?

If you have any ideas or suggestions, it would be greatly appreciated.