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Discussion Starter · #1 ·
have a 2006 gmc sierra 3500 srw 4x4 duramax with 95000 miles
1st problem when I move gear shift selector to the M position nothing changes and unable to manually shift
2nd problem tow haul mode button also quit working
only problems in 13 years so feel really good about truck
I'm wondering if this is electric switches or mechanical
 

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The wires on the shift lever are tiny and can stretch/pull apart/sever.
You can open up the column and try to repair, but a complete new shift lever with all new buttons and wires, is under $100.

There's also a good WhoToob vid on how to access it....fairly easy repair.
 
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