The 1 and only key fob doesn't work. Tried using the key but the alarm goes off on 2006 Dodge Charger

When the alarm goes off it prevents me from driving because it shuts off the engine. Now I am stuck at a grocery parking lot.

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2 answers
Fob probably needs new battery, usuall alam will disarm if key is used in driver door
try battery or get a new fob