This Smart StopStart Module allows you to permanently disable Engine Stop-Start (ESS) in your 2018 Grand Cherokee / 2018 Dodge Durango. I had it installed in my 2018 Grand Cherokee, it works great - selling because I traded in my Jeep for the one with HEMI that does not have ESS. It currently sells for $129.95 on their website. Please double-check the compatibility with your trim on their website: Jeep-Dodge-Chrysler Products