Check with Jeep.
My 2019 Grand Cherokee does not require the battery to be disconnected, however, the 2020 Grand Cherokee does require the battery to be disconnected. And that change is a real PITA because the battery is under the passenger's seat.
Changes often happen mid-model year.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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