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Tow/ Haul Mode Not Working

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Hi guys, new here.


I've done some searching and haven't found really what I'm looking for.  I have a 2012 GMC Sierra Denali and the tow/haul mode does not work.  The light on the dash does not illuminate nor do the shift patterns change under load.  I did work until recently.


I have read about the orange wires breaking in the column on older models.  Does that still hold true for the 2012 models.  There isn't a lot info out there on the newer models.  I'd like some better knowledge before I just start taking apart things.  Is it easier to repair the wires if indeed that is the cause, or just replace shifter/switch?


Thanks for your input.

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Most likely one of the  wires has broken where they twist due to the steering wheel moving. The easiest way is to bypass the normal button and put a momentary button somewhere else. The voltage/amps are low so doesn’t need to be a hefty switch. 

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Well, I took some time yesterday after work and disassembled the steering column plastics.  I found the orange wire and sure enough it was broken.  So not only is this an issue on the older trucks, it's happening on some of the newer trucks too.  

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  • 2 years later...

Having same issue with my 2001 1500 silverado. Thought it was just the bulb and figured tow mode was still working, but I switched over to a remanned 2500 gauge cluster to get the tranny temp gauge and it still does not light up. Guess I will check the wire in the column. Shifter is pretty loose between gears, so I might swap that out when I go in. Don't want the dog knocking in out of gear! Hopefully that gets my tow mode back as I just bought a 8K Travel Trailer....

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  • 1 year later...

Broken Wire! Added in a small length of wire and put everything back together. Replaced the torn boot and shifter spring while I was in there. Works great again.

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