Absolutely not!! I have both the Underhood Generator and the extra engine cover that many of us have to protect the UHG and more. None of it had anything to do with my two recalls on my 2018 van (the cooling fan and the transmission thing). Over on my Zion/Simplicity page on Facebook, a few sleazy dealers did try to charge, but were fought down on it. Call the FCA helpline.
When I reminded my dealer's service guy of the two added items, he just said... no problem... the fix won't be anywhere near it.
(BTW, the underhood generator has no relationship to the Ecotrek system which refers to the lithium batteries... this is two completely separate options)
2019 Roadtrek Simplicity SRT (almost a Zion)
2015 Roadtrek 170
2011 LTV Libero
2004 GWV Classic Supreme