Gen 1 Prius with P3000, P3009 - no other codes or engine lights

Hi I'm looking for direction on how best to move forward with the following fault codes P3000, P3009 on my 2002 Prius. The mechanic who retrieved the codes said there were no sub-codes. There were also no other codes, or check engine lights, etc. Just the initial triangle with exclamation mark over car symbol. Car runs normally. A few details, I just bought the car from a private party and appears to be in good shape- but I don't know the history on it. Not sure if its relevant, but the master warning light (triangle and car with exclamation point) came on for first time after it rained extensively for a week here in Los Angeles, and after (perhaps a day or 2 after driving through a fairly deep puddle). The mechanic that retrieved the codes does not have the more expensive tool ( high capacity voltage meter perhaps?) to further diagnose the specifics of this leak (p3009). I would like him to do repairs ( he specializes in Japanese cars and works on hybrids like the Prius but doesn't specialize in it) and he suggested that I get further diagnosis from Toyota then come back for repairs with him. I'm trying to resolve issue as painlessly as possible (i.e., I'm broke). What should be my next step to ensure I don't end up paying for repairs I don't need or premature or redundant diagnosis.

Thank you!!

 

Is it at all possible that a poor auxiliary battery can cause these codes? The codes went off by themselves and stayed off for month before just now coming back on after jumping my Prius ( the Aux battery needs replacing Ive had to jump the car a few times. This particular time was jumping from a portable battery I bought from Autozone - this is when the warning light came back on after clearing itself over a month ago.

Thanks for the input btw!

 

Thanks for the input. I've put a call into Avi at Hybrid Fix but won't be able to get my car in there until at least next week. It appears however I may have a new problem. So this morning my 12v battery was completely drained. I went to Toyota and bought a new true start battery and installed it myself to save some money. Install was easy enough and everything was working great - drove the car all day. Well, just now, I was driving to the gym but had to turn around and head home because the car started running really rough, loss some power and stuttered like it was gonna stall. It was running so rough I thought I wouldn't make it back home. I did make it home and now I'm wondering what to do from here. I live in a busy Los Angeles neighborhood where an unmoved vehicle will get ticketed without mercy (thank God its Sunday tomorrow). Can anyone offer me any DIY suggestions to figure out whats going on, and hopefully make it drivable before Monday. Not sure I would want to risk driving it again (at least not without some input here). No warning lights came on during this event, and of course, replacing the 12v today did turn off the master warning light which also did not come back on during this event. Are all theses issues I'm having related? - from the original master warning light and subsequent P3000, P3009 codes, to the dying 12volt and now the rough (nearly stalling/low power) ride shortly after installing the new 12v? BTW, I really do appreciate this forum and all the help and feedback - just wanted to say that