2010 Prius with P0AFC

First time poster, I haven owned this Prius for about 4 months. It’s a 2010 with 199K on it. Ran great and had no issues other than stopped up EGR cooler. Cleaned that out and was great. It sat for a few days and battery died. Jump started it and hybrid system has been acting haywire. Logged code P0AFC. I removed battery pack, cleaned bus bars, checked voltage and load tested all cells, average 8.05V on each cell with a total 225V, I have an Autel scan tool. I can clear the code momentarily and my hybrid screen goes normal showing the charging bar then few seconds later goes back to “check hybrid system”. Hybrid coolant pump was replaced 15K miles ago before I got it. No sure what the next steps in diagnosing this are. I can communicate with sensor module through OBD port and read all live data. Any help is greatly appreciated.


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I charged 12V battery overnight prior to making this post, let it sit for a few hours and held 12.6V, reinstalled and still having the same issues. The gasoline engine runs separately just fine, hybrid system just will not work properly. Also, took it for a test drive to see what other issues I could have and have a pending P0A80, P0B42.


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Update: 3 drive cycles later and now only P0B42 is active, I feel like I’m getting closer to solving this. Is this a reset procedure the car does after a dead battery?


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Please explain.


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My issue ended up being the hybrid control module at the hybrid battery pack. The driver side tail light was leaking water into the cab and the control module had gotten corrosion on the terminals. Replaced it with one from eBay and fixed it right away. Now I’m replacing battery cells because I’ve have 3 go out in the last 4 months


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