Do these codes together mean that my high voltage battery is failing as a whole? I don't have any specific module codes this time, like I did last time I experienced a problem and replaced 2 modules. Now, every time I get into the car the battery indicator goes from 6 bars or so straight down to 1 bar and the red triangle comes on. These are the codes I get and I can clear the codes and drive the vehicle just like normal until the next time I leave the vehicle off for 6-8 hours. Then I'll get these codes again when I first start the car. I've checked and my module voltages are within .23 volts of each other. The battery is also draining pretty quickly and the ice engine kicks on a lot. Posted via the PriusChat mobile app.
Are you able to just check battery module voltages after it sits for several hours? Just press power button 2x with foot off the brake and then plug in the OBD reader or techstream That will alow communicating with the car while it's not in ready condition. That way the HV battery does not get charged and voltage readings will be more accurate. Its very likely you just have a weak module or two that just hasn't triggered the individual module code yet.
You were right. With the engine off module 7 was 1.02V lower than the others. I have a question though. The other modules were around 15.7V. Isn't this pretty low? I thought they were supposed to have around 17V or something like that. The battery had plenty of time to charge on my commute home yesterday, so I would say this is "fully" charged for this battery. Posted via the PriusChat mobile app.
The HV battery pack has a pretty broad range of charge during normal operation (20-80%). So the actual voltage of the modules at rest can vary quite a bit. With a failed module it will throw off the battery ecu's ability to accurately judge state of charge - so your voltage might be down some compared to when everything is healthy. The ecu primarily cares whether all module voltages are even with each other. Posted via the PriusChat mobile app.
The 15.7 volts per block is ~7.85 volts per module. This is a completely normal voltage. Assuming you meant to say block 7 was 1.03 volts lower than the rest would most likely mean block 7 has one module at ~7.85 and one module at ~6.82 volts. This is pretty common voltage range on a module with one failing cell that has a rapid self discharge problem. I would say you have found your problem.
if you want reliability, replace all the modules with 'newpriusbatteries' $1,600. if you like playing whack a mole, keep doing what you're doing
I ended up getting a green bean battery installed today. I know, I know, it isn't the best choice. But for me, right now, it was the best choice available. I needed my car back asap and newpriusbatteries was on a backorder. I called green bean at 11 pm last night and they installed my battery at 10 am this morning. The car is running and driving great. If I planned on keeping this car another 10 years I would absolutely have wanted a new battery, either OEM or from newpriusbatteries. But I only plan on keeping this car another 2-3 years if it holds up. The car already has 175,000 miles and I'm putting about 40,000-50,000 miles on it a year. So if it could make it to 300,000 miles I would be happy. Using the DR. Prius app it looks like this refurbished battery has about 88% capacity left on it. The car runs for a long time while parked without starting the ice. I'm very happy with my experience and I hope I won't need to use their lifetime warranty. Oh, and I know this doesn't really matter, but a huge shout out to Mike who did the install. My wife said he was a very nice guy who acted very professional and had the swap done on 50 minutes or so. Posted via the PriusChat mobile app.
Because you have the skill/experience of replacing modules, you might want to find a second pack and rebuilt that one and then swap packs as needed. Also if the two modules you replaced were in the same block, that can severely exaggerate block voltage differences so maybe changing that gives you a little more wiggle room once you find the latest bad module We'd be happy to walk you through the dozen different ways to find bad modules if you're gonna go that direction?
