It would be very rare for a P1684 code to turn the light on.
P1684 - Transmission - Battery Power To Module Disconnected if battery was disconected for a while or battery replaced, it can cause to set this DTC
No, the oil change reminder and the check engine light are unrelated.
Yes, you need to have the engine and transmission computers checked for trouble codes. That should lead you towards a possible cause.Yes, you need to have the engine and transmission computers checked for trouble codes. That should lead you towards a possible cause.
have vehicle scanned to determine the problem
If if starts bubbling even if the engine is cold, most likely blown head gasket. If only when engine warm, stuck thermostat.
It might be that your pcv valve is plugged or the egr valve is sticking.
Could be a number of things CONSULT with with your Dealer and have it looked at.
check the solenoid, and the starter.
Loose belt - will sound like a screeching noise.
when my dodge stratus started to do that it was because I needed transmission fluid.
Failed fan motor, relay, wiring, fuse, computer.
Fix the cause, use a scan tool, or unhook the battery.Fix the cause, use a scan tool, or unhook the battery.