P1684 - means the supply voltage was disconected during the past 50 miles. Did you diconnect your battery?.
Battery's been disconnected or ran down to nothing within last 50 starts. Nothing to panic about. will go away, or stop at autozone & ask them to erase code, usually for free.
1684 is 'battery disconnected in last 50 starts' and should shut off after you have used it for 50 more.
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SOURCE: what does error code P 1684 mean when check engine lite is
Dodge: The battery has been disconnected within the last 50 starts
SOURCE: What does check engine code
P1684 means the battery has been disconnected from the TCM(transmission control module)
Possible causes:
Autozone or Advance Auto Parts can do a battery and charging
system check for FREE. If both are ok,
then it will need testing for a open or short in TCM wiring harness or
connectors.
P0455 a large leak has been detected in the evaporation system.
Possible causes:
I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514
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