Hi,
1- Mean:
Main contactor
improbable, contacts not closed. Wire
connection interrupted, faulty main contactor driver on traction
controller
Driver on AS4803z
steering controller faulty.
2- Posibility caused by:
Check wire connection.
If error 19 is also present, disconnect
the shorted power stage
Disconnect the power positive.
Check driver voltage (switched against
negative). If reading OK, check
contactor coil and mechanics.
Check AS4803z steering controller, replace if need
Good luck