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the p1647 is not a dodge code please check again by turning the key to the on position and off three times the third time your odometer will show you the codes
CODE P1684 - BATTERY HAS BEEN DISCONNECTED.LOOK FOR LOOSE BATTERY CONNECTIONS. ARE BATTERY ITSELF HAS CELL PLATES SHORT INSIDE OF IT. CODE PO171 - FUEL SYSTEM LEAN. CODE PO462 - FUEL LEVEL SENSOR NUMBER 1 LOW INPUT. ALL YOUR PROBLEMS HAS TO DO WITH CODE P1684. CHECK BATTERY HAVE IT LOAD TESTED AND CHECK BATTERY CABLES FOR TIGHTNESS.TO KEEP FROM LOCKING OUT RADIO TURN IT OFF FIRST BEFORE YOU DISCONNECT NEGATIVE BATTERY CABLE.
Your code isn't listed in my library but if your new battery discharged overnight, the alternator can definitely be at fault.
This can happen when one of the diodes has partially or completely shorted but this will normally also show via the battery symbol on your dashboard if it is a 'hard' short.
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