Most probably the control board has fried.
I have had two control boards die although I haven't had error 18.
Two of the mosfets which control one of the motor phases goes open circuit.
I have tried swapping the mosfets from one board to the other but that doesn't work at all.
Your best bet is to replace the control board and use the regenerative braking at conservatively as possible.
This is obviously a design flaw. My M365 with no back brake brakes awesomely going down steep hills.
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