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Test Description

WARNING: This page is about a different car, the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step tests the battery positive and ground circuits for poor connections.
  2. 3:  This step tests the encoder motor for an internal short to ground.
  3. 4:  This step helps isolate motor malfunctions from the transfer case shift control module and wiring.
  4. 5:  This step tests for an open, high resistance, short to ground or short to voltage.
DTC C0306

Step Action Values Yes No
Schematic Reference:  Transfer Case Control Schematics  
Connector End View Reference:  Transfer Case Control Connector End Views  
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2  Check the battery positive and ground circuits at the transfer case shift control module for poor connections. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 8  Go to Step 3 
3 
IMPORTANT: Use test leads designed for this connector and make firm contact with the leads.
  1. Turn off the ignition.
  2. Disconnect the encoder motor.
  3. With a DMM at the encoder motor pigtail connector, test motor control A and motor control B for a short to ground within the encoder motor.
Is motor control A or motor control B shorted to ground?		 - Go to Step 6  Go to Step 4 
4 
    IMPORTANT: Use test leads designed for this connector and make firm contact with the leads.
  1. Turn OFF the ignition.
  2. Disconnect the encoder motor connector.
  3. Zero the DMM with ohms selected by touching the 2 leads.
  4. Connect the DMM between motor control A terminal and motor control B terminal and test the resistance in the encoder motor.
Is the motor/encoder within the specified values?		 0.3-35 ohms Go to Step 5  Go to Step 6 
5 
  1. Disconnect the transfer case shift control module connectors C1 and C2.
  2. Test the motor A and motor B control circuits for a short to ground, a short to voltage, an open, or a high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 8  Go to Step 7 
6 Replace the encoder motor. Refer to Transfer Case Encoder Motor Replacement . Perform the Clutch Reset Procedure. Refer to Transfer Case High/Low Clutch Reset .
Did you complete the repair?		 - Go to Step 8  -
7
IMPORTANT: After transfer case shift control module replacement and reprogramming, ensure all doors are closed and the key is out of the ignition, then open and close the doors again and wait 2 minutes to avoid incomplete programming or false communication DTCs.
Replace the transfer case shift control module. Refer to Control Module References for replacement, setup, and programming. Perform the Clutch Reset Procedure. Refer to Transfer Case High/Low Clutch Reset .Did you complete the repair?		 - Go to Step 8  -
8
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC set?		 - Go to Step 2  System OK
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