Resetting boards
Have you tried the reset procedure described at http://www.justanswer.com/gm/8btzo-gm-yukon-denali-2007-yukon-denali-power-running-boards-inop.html
Update: Quick fix for some of the running board issues
Quick update: well, the "WD-40 trick" worked only for a day. After working fine for a day, the functionality of the driver (left) side was lost again overnight.
I took the entire running board on the left side to parts and everything...
Quick fix for some of the running board issues
I just bought 2008 Yukon Denali and had the same trouble as many others with erratic driver side power running board. As suggested on another forum, I applied WD-40 to running board hinges and the treatment worked great! Boards are back to fully...
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