Narrowing down battery issues

You have a hybrid battery issue. Not a bad idea to replace the 12v too, if it's more than 5 years old. But p0A80 is a bad hybrid battery

 

Check your inverter too, the fluid should be flowing when car is on. Take the cap off the coolant and look inside.. It's not crazy hot like a normal radiator.

I wonder if the car is stuck in regen or b mode?

I'm not sure if an inverter out would have this behavior.

Hard to say the battery is bad if it's not getting a charge.

But the car should shut you down if the traction battery voltage gets too low, similiar to running out of gas.

The inverter also charges the 12 v battery from the traction battery. So it could be low bc the inverter is not charging.

If needed you can charge the 12 v with the tab under the red cap where fuses are under the hood.

But 11.7 volts after running makes me think either your 12v battery is toast or inverter not charging.

I suppose it's possible it can't charge bc the traction battery is bad but usually the car would shut you down I believe if that one gets too low.

Inverter handles current both directions.

 

You would need to get another battery, or read some of the rebuilding threads here if you want to DIY.

With 172k miles, probably wouldn't make much sense getting a new one. So rebuilt options are what you'll be looking for.

 

Clean your traction battery fan blades may clogged blades or the intake is clogged Passenger side open rear door on left just inside there a grill about Shoulders height when sitting the fan about 2 feet back behind rug cover brush then blow out.

Check coolent in all three area two tanks and radiator. When car turned off after a drive can you hear the pump under driver side headlight? Loud replace it. Move not moving replace it.
Battery I would get the full side yellow top battery



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At 172,000 there is still a fair amount of life left in the car if you want to keep it.

There reality is, though, to fix it is going to cost a few thousand if you need it to be reliable . An independent hybrid mechanic might charge around $2,250 - $3,000 depending on if you choose a rebuilt battery or a new one.

It will cost even more if you go to a dealer. $3,500 - $4,500 or more, perhaps.

Do you use this car for regular commuting or is it more of a "spare car".


The advice from other folks on this thread is good. I'd be happy to troubleshoot with you over the phone if you need some help.
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No "might" about it.
At 12.0 volts it is 50% discharged.
Get that replaced first......and then check the charging voltage while the car is ON.

Didn't I answer this same question before ? Or was that in a different forum ??

 

What are you using to get codes?
Can you watch the hybrid battery data live? (block voltages, SOC,)

 

No, wrong.
The next step would be to get the hybrid battery tested/inspected by a dealer or WELL qualified shop before you consider spending $1000 or more on something that you might not need yet.

 

There's really no need to do all the stuff you're doing. The good thing about the prius is the computers tell you what the problem is. There are numerous ECUs that monitor your car. You don't really have to do much to know the problem.

 

Incorrect measurement. That high a voltage means that the car was running.......or in the READY mode at least.
It needs to be OFF to check the actual battery voltage.

 

In your opinion.
Sometimes computers "lie".
For instance, none of them will tell you in an unambiguous manner that the 12 V battery is weak.

 

With a Bluetooth adapter and the Torque Pro app you can see all the hybrid battery block voltages.

This will help narrow down if the hybrid battery is the issue.

What app are you using with the Bluetooth adapter?

 

I weighed all my options, and decided in the end to pay for a brand-new cells from Toyota with all of the warrantees and information in tact. My mechanic, Michael from Lexology, refused to let me purchase the battery and install it myself, so I purchased it installed for just under $3000.
Subsequently I purchased a 2006 Prius that had been totaled with 100,000 miles on it for $1000. I sold the battery for $1500 and used the engine to replace the engine in my 2005 Prius when the engine died at 380,000 miles. Changing the battery took three hours. FYI


iPhone ?

 

Did you replace the 12v battery first?

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