Ive found 3 codes and i want to know how to fix it.

Question

My battery keeps draining and i really dont know what the problem is i changed fuzes and alternator ..car runs and check engine light goes off for about 3 days then comes back on again with a dead battery

P1768
P1784-transmission system 1st or reverse gear fault
P0302cylinder 2-misfire detected

Answer 1

P1768 Transmission relay control circuit

What you have is a short in the circuit, the way to find this is to know what fuse goes open , if any of the fuse goes open instead of draining the battery