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I've owned a few GM products before. I've read on other forums that with 200X model years, a wire that runs through the column shifter gets weak and can break (or short out), causing intermittent, reproducible failures with the tow haul function. There are youtube videos that illustrate how to replace the shifter or repair the wire.
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2017 Keystone Bullet 308BHS in Saddle.
2017 RAM 2500 Laramie Mega Cab 4x4 Hemi 6.4L
2008 GMC Yukon XL Denali (SOLD)
Hensley SwiftArrow Control Hitch with 1000 lb Spring Bars
Me, DW, (3) little DS's, and 1 rambunctious Boston Terrier
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