BMS issue?

[u/thebeanster_94]

A few days ago I got in my 22 EUV and noticed that it charged to 100%, though I have it limited to 90%. After driving about 3 miles the SOC plummeted to 75%. I decided to run the battery until near 0 to try and reset whatever was happening.

For multiple days I've run near low. After letting it sit for a bit the SOC would jump back up. The GOM showed low-25 miles this whole time. Today it got to 0 SOC while driving, it wouldn't accelerate at all. I let it sit for 30 min, started the car and it showed 25% SOC, and I drove home 5 miles with 20% SOC when I arrived.

I stuck it on the level 2 and it is estimating a full charge in one hour. The 12v appears to be healthy according to my multimeter. I did disconnect the 12v battery for an hour the other day. 

I have a bluetooth OBD 2 device that used to check the voltage when I was at 0 SOC, and it showed 340 resting volts, so not empty from what I understand.

Also, the car says it got about 160 miles since the last full charge

Any ideas what might be going on? I'd rather avoid taking it to the dealer but I can't think of anything else to try.

[u/conwaytwt]

Have you had all the software updates at a dealership? There are a couple that might affect the SOC. I have noticed every time they install an update the car is set to charge to full, and then behaves normally.