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2017 GMC Denali 2500HD, 3.5" Rough Country Lift, 305/55R20 Cooper Rugged Trek, Paragon Bed Cover
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It's not just GM, unfortunately. The Big 3 all have issues with the emissions controls on the diesel trucks. When a sensor misbehaves it causes lots of headaches.
 

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Super Moderator
2017 GMC Denali 2500HD, 3.5" Rough Country Lift, 305/55R20 Cooper Rugged Trek, Paragon Bed Cover
Joined
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3,703 Posts
Yup. Makes you wonder if there couldn't be an easier system. Likely, they make it complicated with all these checks that eliminate the possibility of any modifications. Also wonder, how much price the system adds to the price of a truck. 5k? 10k? got be in that range. Not only the price of the system but all that R&D they need to pay for.
That's an interesting thought, though. Did the price of the diesel option increase significantly between the LBZ and the LMM or LML? I've never bought brand new so I don't pay much attention to how much the diesel option costs from the factory.
 
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