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I recently had the same issue on my 2021, took to local dealer and they ordered a replacement DEF tank. This is apparently a known issue within the GM tech circle. My DEF level would go from 3/4 to empty saying xx miles to limp mode and after a couple days would show correct level. Take it in...

We have the weight distribution hitch and it is set up for tongue height of trailer with it level. Pulls better with the Airlift system in our xperience. Our Elevation no longer has the 2.5" factory rake so without the Airlift it does squat in the rear even with the load leveling hitch and bars...

I had the Airlift system installed on ours, eliminates all the sag but if you take to the dealer for anything suspension related be prepaired for the inevitable: " We couldn't duplicate condition with the notation of Customer has aftermarket suspension "

Good news there for sure. Do you know if the Bilstein 5100 takes the factory 2.5" rake out of the ride height?

Good to know mine is not the New, just maybe the norm.. Been this way since i drove it off the lot...... I will be looking into a different Strut/Shock package as the Rancho's they have on it are trash.. Also to take the 2.5" Rake out of the truck as well.

This is True... I haven't checked on the 10speed Allison in my Elevation but it may be on the top of the pan flange lip ( stubby 18mm ) like my 2010 F-150 is.

Hello everyone, new to this forum and was wondering if anyone else has an issue with their suspension? 2021 GMC Elevation Z-31 3.0 Diesel Front suspension seems to hit hard/bottom out; almost feels like struts are busted or the stroke is too short.

Nope... I bought mine 10-21 in Georgia, same issue.... Fixed now after ECM flash at dealer.