Help diagnosing HV battery issue on 2006 Prius

12.55 is excellent if the car was off for several hours. not sure how they test it. let's see what the report says. what does the warning on that label say about hybrid vehicles?

 

Give charging a try, I'm not one for throwing out serviceable parts. Only trying and time will tell.

BTW, refer to the chart above, 12.55 V eq ~ 62% charge, not 89% (for an AGM battery.)

 

Most likely some of the others, but likely not the P0A80. The saving grace is that you do not have any P301x codes. But it could just be a matter of time.

It might be that while sitting, the car self-discharged to the lower limits and running it brought it back up. Only time will tell. But just run with it and start saving for either a new HV battery or a updated car deposit. Whichever suits your circumstances, skillset, appetite for risk, etc.

 

If you have to rely on the dealership or any other professional, they should know to do these things. You can ask they check the battery voltage and charge it up before installing. But at the end of the day you just have to trust in the professionals you employ.

 

Your attachment shows the P3000 highlighted, which I take it means there is a sub-code for it. P3000 is logged by the hybrid vehicle ECU and really just means that it heard from the HV Battery ECU that it (the HV Battery ECU) has a problem.

 

Invest in a Prius Aware Scanner that will give you the subcodes. There several to choose from such as:

• ScanGuage II
• Mini VCI
• Denso Hand Held Toyota Tester II
• ELM327 Bluetooth OBDII Scanner

I have all four and like the HHTT II the best, but it's pricey at about $300 off eBay. The ScanGuage II was about $150; I bought mine at Autozone. The Mini VCI can be bought off eBay, but you need a laptop (running XP) to run it or good computer skills to get it to run on Win10 in a virtual box. The ELM327's are upwards of $3 to $20 on eBay, they work with Android Phones. I like these, but the ones I bought (the little blue ones..$3) worked on all the other cars, but not my Prius. Everything I read says to buy a more expensive one.

Read up on these within the forum searching on Code Reader. In any case, you free yourself from the auto parts Stores and from the Dealers when you have one of these in your car or garage. It's nice to be able to better diagnose a vehicle and shut off codes when applicable.

 

Battery block 12 looks bad.
If you had an Elm 327 OBDII Bluetooth reader you would have seen it within 30 seconds connecting it to the Torque Pro app.

 

You have a failed HV battery. It's been slowly failing since the day it was built nearly 13 years ago. Extreme temps, whether it be hot or cold, can be the final straw to trigger the codes. For me, it was the summer heat and letting it sit too long unused.

GOOD LUCK!

 

In my opinion it is too far gone for balancing.

I would move on to with her replacing the module or the entire pack.

FYI, Toyota just dropped the price of a Gen 2 pack by approx $400. If you got a quote prior to January 1st, it should be less now. Unless they plan on keeping that $400 for themselves.

 

The P0A80 file contains the smoking gun. Battery block 12 contains the failed module and cell. This reading could be easily rechecked with a Prius scanner looking at live battery data while doing a forced charge and discharge.

I would hold off on replacing the 12 volt battery, but I'm cheap.

You do need to start looking for a HV battery.

Brad

 

I like Hometown Hybrids. It's been fun to see Jessica's business thrive.
Honest, knowledgeable folks.

 

I don't know if Hometown does NEW Toyota packs, but it might be worth asking just to find out pricing.

Report back here if you find out.