P0BE6 sounds like a really bad error. Most likely this triggers P317A and P3178. The Brake/ABS errors are standard whenever the car starts up without traction battery power, you can ignore those.
The motor U and V and W phase windings are what transfers power from the inverter to the spinning part of the motor (=rotor) and an error in the current sensing component like P0BE6 means either the current sense circuitry is faulty, you have a bad connection between inverter and motor or there is a broken winding in the motor. None of these are errors you ever want to see. The inverter is a very complicated and hard to repair package and the motor is sealed for life, so this almost certainly means replacing your drive unit, unless it's just a bad connection.
I hope it's just a current sensor fault.
The service manual simply says: replace inverter. That's going to cost you a lot.
If you have access to good tools, you can attempt to inspect the inverter yourself. This is highly dangerous and if you have no experience with high voltage and high power electronics, I do not recommend proceeding. Save yourself the risk, both of you working on these kinds of electronics and of you 'fixing' it, not properly resealing the package, getting water in there and crashing on the highway.
I do not have experience taking apart the inverter. All I know is that there are some non-important (for this purpose) electronics on top (easily accessible), then a big water block and underneath there's the big IGBTs and current sensors. You will somehow need to disassemble the inverter package to that bottom level where the power electronics are, you will find the motor connections and current sensors near there too I presume. Other people may correct me on this.
Alternatively, if this is all OK, the problem may be in faulty connections on the motor side. That is just a total bitch to get to. I'd pay the money to the garage to fix that.