I have a 2019 VW e-Golf SE with 10,500 miles that I have owned for 2 years (trouble-free...until recently). Two months ago, the car experienced a sudden drop in battery range while driving. The battery was charged ~60% full, and within seconds, the range monitor dropped from 80 miles to 5 miles of range, the battery gauge dropped to the red, and the message screen displayed "limited battery performance, switching to turtle mode" alert, and the power dropped to reserve power (turtle mode). We drove the car home in turtle mode. The next morning, I started the car with no problems, the range monitor/battery display was back to 60%/80 miles and I was able to charge the car normally.
The car has performed normally until last week when the battery display/range dropped again while sitting at a red light at a busy intersection. Same display of "limited battery performance, switching to turtle mode" and we had to pull the car off the side of the road. I shut down the car, restarted it, and the battery gauge and range were back to normal and I drove it home.
I scanned the car for codes using an OBDLink onboard scanner, and it showed no fault codes detected. The car is now sitting at my local VW dealership:-(
My guess is that this is a problem with the Battery Management System similar to the recall in the 2014-2016 e-Golfs (recall #16V138000). Any ideas or suggestions would be greatly appreciated!