Hmm... I had this error pop up again last night. The car was charging from 38%, at 240V, 40A, in our 95F garage, with all fans funning. I disconnected the charger to run an errand and got the BSM: V_ess too low at end of precharge. ID:276 error right when I removed the charger (hadn't turned the car on yet). I opened & closed the charge port door a few times and cycled the key a few times to no avail. I disconnected the OVMS, no luck. With the key out, I removed the lighter socket to USB adapter, put the key back in, turned the car on, and the error went away. Could this be a coincidence or could there be something with the adapter that's causing the error? The adapter is a Qmadix MMCH-DUO (although it's the single USB version) http://amzn.com/B004Z5GPO6. The adapter came with the car.