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This technique of pressing the dead key to the starter button works for quite a lot of brands, not just Stellantis vehicles. Always worth trying if you are in a "keyless" car with a dead key fob battery.

In my experience virtually everything made in last 15 years will either support this RFID backup or have a spare physical key hidden inside the keyless fob.

Lots of them will even let you press the dead key against some part of the exterior to unlock the doors too.

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What is funny to me is that before the proximity and push https start… the keys had RFID and an antenna at the lock cylinder anyhow.

They just left that same antenna in place (in Chrysler+ anyhow, called SKIM) now as a backup instead of the primary.