Looking for some help - hopefully tonight if anybody is about. I am getting a "Charging Problem" error while charging my Roadster 2.5 with the UMC on a 14-50 plug. I know that the plug is on a 30A breaker, but I've got the current stepped down to 12, 16, and 24A and still getting "Charging Problem. ID: 920". What I've seen when the message shows up is that it seems like the voltage is spiking up around 247V (12 or 16A), or over 240V (24A). I have also noticed that the charging goes longer to failure at 24A (a whole minute or two, instead of 30s at the lower levels). I've searched the forum and called Tesla - apparently I am the first human, after the programmers that created the error, to have seen it. My operating theory right now is that the voltage is getting too high - for the car, for the UMC - something in there. Any suggestions? Asoka - - - Updated - - - Some additional detail. The behavior I am seeing is that the car goes through the normal sequence to start charging, ramps up the amps, and begins charging. It charges for a short period (much less than 5 min), and then throws the Charging Problem error. About 1-2s before throwing the error, the voltage cuts in half briefly (and then falls of to zero with the error). After a few seconds, the error clears on its own, and the car goes back through the sequence of starting a charge, actually starting to charge, and then faulting again. I was originally in Range mode - it's starting to get chilly here in Valley Ford, so I've switched to Standard mode (not going to get a Range charge tonight anyway) and to keep all the incoming power for the battery (or as much as possible). After 3 or 4 cycles, the car stops attempting and shuts down charging.