This was "supposedly" a 2004 only problem my dad was told.. But, dad's 04, my 05, and my uncle's 05 all have/had cluster problems..
My 05 the speedo will intermittently work, and the gas gauge is nowhere near correct.. (I ran out of fuel with nearly 1/2 tank showing last week).. Speedo started acting up at about 130k, dunno exactly when the gas gauge started acting strange..
Uncle's 05 Duramax has a fuel gauge issue.. We took it north snowmobiling and thought we were getting great mileage.. 12 miles from our exit off the freeway it went from 1/4 tank to low fuel light and ran out of fuel in 1/2 mile.
Dad's 04 had a speedo issue, and was "covered" by GM.. Mine was over the "covered" mileage, and uncle's was too old by the time he/we found out it had a issue..
I think GM would cover it if the truck was under 75k/5 years old, IIRC.
I dunno if the 06's had the same issue or not..
As for the 6.0.. I only know of 2 people personally that have them.. One has nearly 300k on it and still runs strong, and aside tune ups and normal maintenance has been trouble free.
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