Got a P1516 code this morning after stopping for some coffee. I'll be pulling the truck (87mm) TB off, cleaning it and reinstalling. Foken code could be a multitude of things from bad TAC, bad X-link (Not likely per X-link FAQs), bad TB, bad grounds or bad TB wiring.
First thing to check is if TB blade is binding and if its got any play at the blade. If it all checks out, finna take a DMM to it and spec it. If that dont fix it, check wiring for broken/loose cables.
If all else fails, im buying a new TB :nono:
Stay tuned