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I should also mention that the CVLI test showed no problems in my case. The tech said the test likely doesn't replicate the same circumstances that cause my problem. I took several videos of the sudden SOC drop and turtling and these went along way in getting our service department to take action.

I think you could be right. I also suspect when Nissan rolled out the BMS update, they made it more difficult for DTCs related to the battery to be set. Clearly the diagnostic systems for DTCs is woefully insufficient to give an indication of real world battery problems, which prevent the...

Yes, sorry 1V not 1mV.

Nissan finally got the data they were looking for and approved a new 40kW battery for our car. The tech had some trouble downloading the data. The Toughbooks they are using are laughably antiquated and there seem to be frequent updates from Nissan for the diagnostic software as well as the...

Sorry to hear you're in the same boat! Is your car a 30Kw? How many SoH bars do you have? The silver lining for me is that we're going to get a 40Kw battery under warranty one way or another. It's just been a massive pain in the ass this winter and looks like it will continue to be so until the...

So my issue is getting worse. My car is now going into turtle mode and power limited mode at high SoC (50-70%) and with a warm battery (5-6 temp bars). Previously, it was only doing this when the battery was 4 temp bars or less and a SoC of 50% or less. It's only doing this on the highway and...

Yeah, it's a major problem here even in a mild winter. When we can't drive on the highway slightly uphill with a reasonable battery temp and high SoC, I'd say the car is failing to perform normally and reasonably. Around here, we simply have to be able to drive on the highway uphill and in cold...

I think he did say they were 16's and 17's, but I will ask again next time we talk. He did say that there was one other car this winter (not one of the other 4) with a 30kw battery that was having similar issues but it lost another SoH bar down to 8. They replaced it with a 40kW battery. He's...

I've had the same sudden drop in SoC, turtle mode and power limited when driving on the highway at lower temps. This winter it happens every time I drive on the highway with even a slight sustained uphill grade when the battery temp is 4 bars or less. I've had it happen with SoC ranging from...

I was just poking along on the highway at maybe 60mph on a slight uphill, about 7 minutes into the drive. It wasn't even that cold out, maybe 20F or so.

I've had the SoC drop from around 60% down to under %20 in less than 20 seconds. It will then come back up even faster when there is less load on it. I'm gonna try like hell to get it to generate DTCs, since it seams thats the only way Nissan will fix the car. I'm just not crazy about...

I hear what you are saying. However, the issue here is not trying to identify the problem. Everyone here knows what these battery issues are, my local service department stated that there are bad cells/modules, Nissan corporate/engineering knows there are bad cells. Everyone is well aware. We as...

My understanding is that Nissan will not recognize information from Leaf Spy or any other 3rd party app as valid. So I don't think providing cell voltage histograms to Nissan will help very much. We're pretty much at the mercy of what Nissan will do for diagnosis. Nissan could provide authorized...

My 2017 is experiencing similar malfunctions. However my car is not generating any error codes at all. Check out the youtube video. It turtles just after the 2:45 mark in the video. My Leaf also will suddenly drop multiple SOC bars (40% charge or so) and then will come back up within a few...

So our local Nissan service department gave us the car back after having it their shop for almost 8 weeks. The service techs have been in communication with the Nissan engineers and had been trying to recreate the problem and get an error code. They were unable to recreate the problem. The...

Ok, thanks for the replies! Your descriptions sound consistent with what is happening. I'm not sure about the error codes but I will ask the local service techs to check. I will also confirm that the BMS update has been done, although I'm pretty sure it was done a couple years ago. If there are...

This is my first post on this forum. Thanks in advanced for all the info, help and advice! We purchased our leaf new in 2017 and it now has just over 54k miles. We're down to 9 bars on the battery SoH indicator. We rarely rapid charge with level 3 and most of our charging is overnight on the...