Yes, one of the 3 wires.
Thenose could be the motor screws touching the rotor / fan inside the motor as I suggested earlier.
If you re run the motor out of the car does it do the same thing? With the motor removed from the car is the gearbox quieter when spinning the wheels?
Have you go the motor screws mounted in the correct sets of holes for the size of pinion your using (easy mistake to make on the M0 chassis)
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