2007 Yaris p0304 / alternator

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A week ago today I went to start the car, and there was absolutely no power. Called AAA. The first thing that I was told was that they do not replace Yaris batteries....okay.

Towed where AAA said to take it. Diagnosis: Alternator. Left it there, next day paid $435 and started to drive home. Car died but was able to get to the side of the road. Called place, no answer. Tried starting the car, it worked, gave some gas for a few minutes and just let it idle. It has been fine since. Yesterday I noticed when turning on the blinker it was extremely fast.

I decided even though I see no check engine light on that I would connect my code reader anyway. It came up with p0304. I erased it, and it has not come back on.

I looked up the code, and well I can't make sense as to whether or not the alternator has anything to do with that code.