That would suggest that you do indeed have a real issue. Somewhere in the battery pack, thermal expansion during charging is touching the outside of the shell. The best way to test this and be certain; have everything ready to measure the isolation voltage the moment it charges to 86% and the error occurs. Then you will be about to see if a voltage is remaining after the capacitance is slowly leached away by the measuring equipment while the battery is still warm.
I've heard tell that your 12V "car" battery may be bad. The car needs it to run the systems and won't start if its low. Try getting a jump. Good luck.
That is the first answer with that kind of warning. If you’ve got a trickle charger you can probably throw it on the thing and make it work. Whether it will do it NEXT time of course is an open question. The problem is batteries are a bit like balloons. They start at a voltage higher than 12v, and are empty at a voltage lower than 12. The leaf requires 12v or more all the time or it gives that reading. This is why some people put LiFepo4 batteries in them. Those are 12.8 till the bitter end. Theyre really expensive though.
My 2021 Nissan Leaf stalled when I was trying to move away with the 'Service EV System' fault screen. It turned out a battery module (module 4 to be exact) had failed in the main battery pack. Fortunately for me I was still under warranty but the vehicle had to go back to the main depot up in Sunderland (UK) for a replacement module.
Hi, I just got service EV system and unable to start on my 2022 Leaf while charging at level 2 charger, stopped at 44%. I had the car towed to dealer and they found same codes as multiple people in this discussion (P31E7-00 and P0AA6-1A). Dealer cleared the codes and managed to charge the battery to 100%, no faults found. I drove it down to 79% and put it on the level 2 charger overnight. In the morning it was 98% and service EV system including unable to start message. So it's again at the dealer, they are going to drop the battery, unseal it, measure and then report to Nissan. Is this regular procedure? Im little bit worried about unsealing the battery, mainly questioning if they will be able to remove moisture and reseal it well. The car has only 36k miles so it's all under warranty. Does the service EV system message always comes up during charging or has anybody got it also while driving? Did anybody manage to get towing and rental car refund from Nissan? The cost is starting to pile up even if Nissan covers the repair cost.
Hi, I was on this thread for the same issue that you seem to be having. My car operated ok for the first six months I had it (bought a 2022 second hand with 38,000 miles) and then one day I saw the codes. Replaced the 12V battery etc but problem came back. It only happened after a charge (level 2). It would charge up to a certain point, cut off, and threw the two codes. I drove it until it needed a charge, plugged it in, had to clear codes etc. A few times early on, I saw the codes on different occasions, a couple of times after I parked without charging, and once while driving. It seems in my reading countless stories about leafs that most people see the codes at various times and did not relate it to charging, but I could be wrong. I'm in the Bahamas, so I have no option to take this to the dealer and there is no EV mechanic here willing to take the battery pack out to have a look. Basically no options other than to clear codes and keep driving. Which is what I did. For 6 months. The problem appeared to be getting worse over time, as it used to stop charging around 86%, then it would stop in the 70s, then 50s, then 40s etc. Later on, and because it got so bad, I worked out that if I cleared the codes and plugged it back in, it would charge a little further before cutting off. I could get it back up to the high 70s after multiple rounds of charging/clearing codes, but no further. One day, out of the blue, after multiple efforts clearing codes and trying to charge a little more, I left it overnight to find it charged 100% in the morning with no codes. I was in shock. This is after 6 months of errors after every time I charged my car. This happened in August and my car seems to be working ok - I hold my breath every time I start the car after a charge because I half expect that the problem is lurking around the corner but so far it hasn't resurfaced. I have no idea why this started out of the blue or why it apparently fixed itself. I know this doesn't sound like advice but I thought to share my story in case it means that there are some problems that do work themselves out. Jury still out on mine. Best of luck.
Just a note to say that my 2022 leaf threw the 2 codes after it reached a certain point in charging (which got lower over time) and only then. Once the codes were cleared, I was able to operate the car normally, start, re-start, drive multiple times etc without seeing those codes again until it was charging. Unusual perhaps, but that was my case.
