2 Answers

P1684
Means the battery was disconnected(or had been drained to a low voltage) recently.

Code P1684
For Chrysler vehicles, a code P1684 represents a battery disconnected within last 50 starts. Although the code signifies a battery-related issue, diagnostic codes do not tell you how to proceed with repairs. It is the job of a trained professional to further diagnose and repair the problem.

Solution
The most common reason for this detected trouble code is a new -- or recently reinstalled -- battery. If you have not replaced your Chrysler's battery, code 1684 may indicate that your battery is running low on power. In this case, proceed by replacing the vehicle's battery.

Read more: Chrysler Code 168.4 | eHow.com http://www.ehow.com/facts_8009193_chrysler-code-1684.html#ixzz2JT9wWhAY