Jwisco

Turned out to be a corroded power wire to the liftgate module causing an undervoltage at module. You'd think that would cause a code of some kind instead of just ignoring the whole module.

Dealer plugged their scan tool in and found no codes. After telling them what all I had done is when we set appt with their electronics guru up.

Have a 2020 Silverado 2500HD LTZ duramax with power up/down tailgate. None of the buttons work to open or close the tailgate, on tailgate, in cab, keyfob. No lights flash, no error message on screen, no actuator noise, nothing. Really annoying with toneau cover, but did manage to get that popped open. I have pulled the plug on tailgate switch, continuity test it acts like it should. Held the button in for several seconds thinking maybe it was disabled like the multi pro gates can be, nothing. F20 fuse in LH dash fuse box is good and has power to it. Pulled fuse for over 5 minutes and replaced, no change. I have an appt with dealer's electronics guy in a couple weeks, after I get back from a vacation. Just wondering if I missed something thats easy to fix and can save the no doubt several hours they will have to dig into it. Why the F there is no manual backup option... I now have a very heavy 4 door sedan as its useless as a truck. Edit to add: Camera and light on tailgate function normally.