2002 Dodge Neon 2.0L with engine code P1684, it backfires then runs rough and loses power.
H there,
This code is not the cause of this. I would check the ignition coil and spark plug wires as possible culprits.
P1684 - BATTERY WAS DISCONNECTED WHEN MONITORED Whenever the key is in the Run/Start position. SET CONDITION This code is set whenever Transmission Control Module (TCM) is disconnected from battery power B+ or ground. It will also be set during the DRBIII Quick Battery Disconnect procedure. POSSIBLE CAUSES
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