2010 Prius Check Hybrid System Warning - Need Help

Hopefully it goes well for you and lights don't come back, but that's rare... Now's the time to get educated on preventative maintenance to your hybrid system though. If I were you I'd be suspicious of corrosion in the bus bars and voltage sensing wires. Getting that cleaned up, as well as maintenance like cleaning the battery cooling fan and making sure your 12v battery is strong will help eliminate those issues so you can focus on the more expensive stuff once it comes up. Also learn all you can about the lifespan of your hybrid battery and what you can do to prolong it here: FAQ

 

Wow...I got a 2010 Prius with P0AA6 with an information code of 526 also. The dealer told me I'd have to start the repair by replacing the HV battery and it still might not be the problem. How is yours holding out? Did your light ever come back on?

Thanks

 

Never underestimate even the most talented mechanic to be so scared of High Voltage work to the point they don't know where to begin in a way that's affordable and maintains customer loyalty. If I lived near you, I'd charge you an hour to put in a loaner hybrid pack to determine if this problem is coming from the pack or elsewhere in the system. Then once the results of that are known, you can narrow it down to more specific diagnosis. Hope you can find someone who's willing to do that?

 

To help you eliminate possibilities, I installed a new stereo yesterday and had disconnected the 12V battery as required. Note: I did NOT touch the hybrid battery pack and Test Plug as advised against by others' mistakes. Upon reconnecting the battery I, too, got the "Check Hybrid System" warning light. Everything seemed fine otherwise. I tentatively drove it around nearby but it didn't clear. Per others' suggestions, after several shutoff-restart cycles (maybe 6-9 times?) the error cleared on its own. That sound is a big sigh of relief as I'd replaced the hybrid battery pack completely about 18 months ago

 

When you say replaced... Did you buy a brand new pack or a rebuilt one?

 

My 2013 Prius II (116K miles) showed the "Check Hybrid System" label and 3-4 warning lights on Friday when I went over a bump. I drove it about 40 miles or so until I took it to the dealership today. They called me an said they needed to replace the IPM inverter module, after they do that, they'll run a diagnostic again. I remember getting a letter a year and a half ago or so about a recall and it said that I'd be contacted if my car was part of it. I never was and today when I run the VIN code in a Prius recall page, nothing came up. Anyhow, this seems to be part of a recall and they're replacing the IPM inverter module for free. I hope that does it and that nothing else is wrong. I did test the small battery in the back and it read 12.2V (50% capacity). I'm happy I didn't try to just get rid of the light by using a bunch of different methods shown online. I also hope this recall/free fix does indeed fix the issue. I'll report back.

 

Your 12v battery needs replacing... There are ways to do that in the $100 range rather than usual $300+ range if you're into DIY and want to learn more?

 

The dealership called back, and they said that the IPM replacement took care of the issue. They did a complete check on the car afterwards and they didn't find anything else, except for some lights that were burned out. I will ask them to retest the battery tomorrow when I go pick up the car.

As a side, they are saying that they need to replace small "market" lights for $120 installed, lights in the front by the flood lights and in the rear on top of the plate. They definitely got defensive when I mentioned that that seemed weird. Seems odd, I may do this myself later.

 

Closing my short saga here. Got the car back, didn't pay for anything regarding the IPM module, just $50 for an oil change and a full check car check up. They said they checked the battery and it was fine. I drove it about 30 miles and everything seems to be working well.

 

I look in to the toyota recall page and nothing show up, my wife has same prius and same year, her show some things to recall. How you see that IPO recall? Did you call on toyota and give to them your VIN?


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