Chrysler Error Code P1684: How to Fix It

Q: Is it safe to drive with Chrysler error code P1684?

Yes, P1684 is an informational code and doesn't affect vehicle safety. However, the PCM may need time to relearn parameters, which could temporarily affect idle quality and fuel economy until the learning process is complete.

Q: Will P1684 clear itself automatically?

P1684 will typically clear itself after the PCM completes its relearning process, usually within 10-20 drive cycles. However, you can manually clear it with an OBD2 scanner for immediate results.

Q: Why does P1684 appear after battery replacement?

P1684 appears after battery replacement because the PCM detects that power was interrupted. This is normal and expected behavior - the code simply indicates the PCM needs to relearn operating parameters.

Q: Can a weak battery cause P1684 to keep returning?

Yes, a weak or failing battery can cause intermittent power loss, triggering P1684 repeatedly. If the code keeps coming back, have your battery and charging system tested professionally.

Abstract

Chrysler error code P1684 indicates that the vehicle's battery was disconnected within the last 50 starts. This is an informational code that tells the PCM (Powertrain Control Module) that it needs to relearn certain operating parameters after losing power.