2004 Prius 226K mi, Red triangle and yellow check engine, brake, VSC lights, red car w/! in display

1. Allow the engine to cool down for some minutes before opening any of the coolant covers(inverter, or engine).

When the engine cooks down you can safely open the inverter cover, then ready the car, and check for turbulence.

If no turbulence, inverter pump has failed.

But I doubt it would be the inverter pump, since no "sign of a car with something like a thermometer " showed on the MFD.

I'm ruling out the pump.

Get the car scanned, if you got a scantool calable of retrieving hybrid codes.

2. Your car is a gen2, and how comes they did replaced your pack with a gen1 modules?

Gen1 packs are prone to leaks and failures.

I'd direct my searchlights to the battery pack, and see what's up. It might be that the packs(modules) are leaking.

3. You can drive the car home straightaway, f you wanted to.

If the cause of the lights on the dash aren't as a result of voltage leaks(insulation problems), car should go into ready. But if it doesn't, then disconnect the 12V battery, for awhile, then connect back.


I'm 100% sure this has something to do with your hybrid battery.


Dxta

 

Reset the error code even if is not listed. Should drive now for a short time. Don't go anywhere with out your scanner

Now am guess unbalanced battery I had the same thing
My voltage all normal but resistance was different on two
Find you highest batter out to . 00 and replace the bad battery then charge two at a time with the same voltage to balance the two cells

Posted via the PriusChat mobile app.

 

You might have two problems here:
1. Inverter pump failure
2. Or a voltage leak problem

If you have an old laptop, you could get a techstream software for $30 or so, and install on the laptop. That would enable you scan the car, and even read live feeds of the hv battery itself.

 

Those are what capacity power supplies you're using to charge those batteries in the rear?

 

Charging 8.1v 2Amp 1amp each

Posted via the PriusChat mobile app.

 

What brands are the power supplies?
You didn't mind clamping them? Prevents bulging of the modules during charging.

 

Only using 2amp very slow and the not warm at all but there in the oem battery case anyway it clamped

Posted via the PriusChat mobile app.

 

Then you for a problem in the HV battery area.

 

Hi Chrisgagne,
I think I saw your post over on Reddit as well.

A visual inspection should clear things up. Of course you'll end up paying the labor charge for that.

A 6 volt difference is huge.
Unlikely to get fixed in a day unless you fully replace it.

If it is a sense wire it is unlikely that the part will be in stock so you'd be stuck waiting. You might be able to kluge something together if you are in a bind and have some soldering skills. But it is not a pemanent or proper repair.

 

This is what Toyota was referring to.

The battery fires at ECU sense connector thread | PriusChat

Or, it could be just one broken wire.

 

-12.7v is not a real reading.
You could call the dealer to see how to order a HV battery wireframe, the cost, and find out how soon it can come in.

 

Darn was hoping to hear the detailed resolution on this.

Broken tab? Where? On a plug?
Something inside the battery?
On a battery ring terminal?

Inquiring minds want to know.

 

If it was a broken ring terminal on the hybrid battery harness I would highly recommend having the entire wireframe replaced.
Otherwise additional sections will continue to corroded and leave you stranded over and over.

But who knows? Maybe that was not the problem at all.