Question about Chrysler Cars & Trucks
Code 1684 is not on the list for Chrysler cars, code 1687 is for the battery voltage dropping below 10 volts. This can occur if the voltage actually does drop below 10 or if the battery is disconnected from the computer.
It could be a wiring problem between the key switch and the main fuse box.
Posted on Jul 30, 2013
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Posted on Jan 02, 2017
Your engine computer is bad. It's a good thing that you mentioned about the check engine light dying also, as this is a classic sign of a bad ecm. I have repaired more than one of these Jeep computers, replacing the three power capacitors located inside the computer, and they have worked for years afterwards. If you don't have the skills or knowledge to repair the ecm, get yourself a rebuilt ecm unit and swap it out.
Posted on Sep 28, 2010
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