Diagnostic Aids

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It is possible to have windings inside the motor shorted to the case resulting in a short to ground causing this DTC to set.
The default actions for C0321 may set C0306.
EL-49741 harnessis a good source for 9 V.
EL-49742 harnessis a good source for B+ and ground.
The transfer case drain plug is a good source for ground.