Hi everyone, long time time lurker. I have an 2007 Prius, about 100k miles on it. About 2 weeks ago it got the red triangle and a check engine light. Torque returns the following codes: P0A80 - Current Fault P3013 - Pending Fault It also says HV battery block with highest voltage is #2, reading in at 16.71 Volts HV battery block with lowest voltage is #3, reading in at 16.64 Volts A few other things that I noticed 1 - The hybrid battery fan seems to be running at all times. 2 - If I turn the A/C on the engine constantly runs and the hybrid battery shows 1 bar and charging. If I turn the air off, then it does charge. If I turn the air back on, it very quickly drains back to 1 bar on the screen. 3 - If I accelerate from a red light, it has no power for a few seconds, then it seems as though the acceleration "catches" 4 - As a test, I floored it on the highway, the revs went all the way up, then dropped, then went all the way up, then dropped, then finally went up and stayed all the way up. I'm fairly good with my hands but have limited time to work on the car. I've swapped out a hybrid battery in a different Prius before so I'm willing to do the work. How should I start diagnosing the problem?
Diagnosis was already done by the car. P3013 means Block 3 becomes weak. That means module #5 or #6 from the non-ecu end of the battery pack is failing.
you've got a nice low mileage car there. put in a brand new battery and you'll be good for another 8-12 years
Pull the pack and verify that that the bad modules are really bad and that it's not corrosion in the voltage sensing wires... Create a spread sheet of all 28 modules and enter voltage you get when you first check, then use a 12v 55w bulb (headlamp bulb if not LED) for 2 minutes on each module and record voltage drop on to spread sheet. This will help you find the bad module, as well as soon to be bad modules. Once you get this done come back to this post and we'll help with finding replacement modules, as well as reconditioning of the pack.
I went back and looked again, voltage for Block 3 did drop almost 1V lower than the rest at one point. I am not sure I want to put $1600 into this car. It is a very practical car but I may be looking into a newer gen prius in the near future. This is very helpful, thank you. I may go this route. I have an HV battery from a previous Prius. It had a bad block and I swapped it out. Should I use one of the blocks from that Prius HV? It has sat for a couple about 2 years.
Do you have only the stack of 28 modules or a small number of modules, or a complete pack with ECU, relays, etc.? If I were in your situation I'd find some professional re builders who usually have piles of extra chassis w/ECU relays / everything but the 28 modules cluttering up there space and catch them on a good day when they'll give you one or sell you one for less $40 Then get some RC car chargers that charge with NiMH algorithm so you can start cycling those old modules, build spreadseet, etc. then order replacement modules and build out that second pack. Then once it's ready, swap it out with the troubled pack and you're back on the road while you work on the other pack. Not only will having a spare pack be a wise investment for yourself, but your fellow Prius owners will be rescued by you at some point too. And when you can fix someones bad battery issue with a loaner pack in less than an hour they'll probably pay you lots of money once the car stealership tells them how much they want to fix it...
You could rebuild the battery that’s already out of the car and just swap them out. Gen II Prius Individual Battery Module Replacement | PriusChat
