Hi and thanks for using 2CarPros. Com.
The P01684 does not indicate a problem, but rather that the PCM memory has been cleared within the last fifty starts. This is the result of the battery being disconnected for an extended period.
The P01685 is another story. Most likely, the smart key immobilizer needs reprogrammed.
I am going to provide several flow chart images which are for problem solving this code. You will see the acronym DRB, which is Chrysler's name for their scanner. If you have a good scanner, it should work.
Here is the definition of the issue from Alldata:
P1685 - INVALID SKIM KEY
At ignition key ON.
This condition exists when the transponder ID (KEY) read by the SKIM does not match any of the transponder ID's stored in the SKIM's memory. The following could be new or does not match, PCM, SKIM, or KEY.
Incorrect VIN in PCM
invalid SKIM key not present
NO VIN programmed in the PCM
SKIM trouble codes set
Go through these and let me know what you find or if you have questions.
Images (Click to enlarge)
Friday, June 22nd, 2018 AT 6:24 PM