C0306 GMC - Transfer Case Motor

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Transfer Case Motor
  • Transfer Case Motor harness is open or shorted
  • Transfer Case Motor circuit poor electrical connection

Tech notes





User Submitted Video

Possible symptoms

  • Anti-Lock Brake System (ABS) Warning Light ON
  • Engine Light ON (or Service Engine Soon Warning Light)

C0306 Gmc Description

The transfer case motor is a bi-directional, permanent magnet, D.C. motor. When energized, through motor control A or motor control B, the ground is provided by the opposing motor control circuit and then grounded through the transfer case shift control module ground circuit, the motor, through a series of gears, rotates a shaft which moves the mode and range forks to shift the transfer case between the following ranges:

- 4HI

- The AUTO or the Adapt mode

- 2HI

- N

- 4LO

This DTC detects an open, short to voltage, or short to ground in the motor control A or motor control B circuits, or an open, or short to ground inside the motor.

OBDII Code C0306 Gmc - Transfer Case Motor - AutoCodes.com

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C0306 GMC Comments

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