Answers: The P1684 is a battery disconnect code, but it merely lasts for 50 starts, so it should've cleared unless you really haven't driven it 50 times since. Otherwise you could be intermittently losing voltage - no voltage when you are trying to start it would label it not start. Losing the battery nouns while driving shouldn't cause a stall tho, since the alternator is (hopefully) providing power.
Clean, check, and tighten the battery-operated posts and connections, replacing anything broken. Have the alternator checked too. Make sure the battery/charging warning hurricane lantern illuminates during the self testing when you first turn on the car (otherwise the bulb could be burned out and you own an issue you aren't getting informed about because the wishy-washy is out).
P1489 is a High speed fan control relay circuit error. Shouldn't explanation a no start unless you are overheating and your engine is shutting down as a result. Make sure the temperature appraise works and any temperature wishy-washy goes on during self exam, so you don't have an overheat lacking knowing it. (until your engine cuts out or worse).
These errors and your issues could also be due to low voltage causing bizarre failure. Again, inspect/service battery connections and enjoy the battery and alternator and mobile cables and the charging system checked and serviced as needed, own the fan control circuit checked and serviced as needed and hopefully that should fix the problem.
The P1489
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