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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:  Listen for an audible click when the encoder motor brake operates. Command both the ON and OFF states. Repeat the commands as necessary.
  2. 3:  This step tests for voltage at the lock solenoid feed side of the encoder motor lock solenoid.
  3. 4:  This step verifies that the lock solenoid battery positive circuit is not shorted to power, shorted to ground, or have high resistance.
  4. 5:  This step determines if the encoder motor lock solenoid is faulty by checking the internal resistance.
  5. 6:  This step tests the encoder motor brake solenoid for an internal short to ground.
  6. 7:  This step tests the control circuit of the encoder motor brake for a short to voltage or an open.
  7. 8:  This step determines if a corroded or damaged connector in the encoder motor harness is the cause.
DTC C0321

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 
  1. Install a scan tool.
  2. Turn the ignition ON, with the engine OFF.
  3. Apply the Park brake and put the transmission in Neutral.
  4. With the scan tool, command the transfer case lock control ON and OFF.
Do you hear the encoder motor lock click when turned ON and OFF with each command?		 - Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3 
  1. Turn the ignition ON with the engine OFF.
  2. Using a DMM, measure the battery positive voltage circuit of the transfer case lock solenoid.
Is the voltage within the specified range?		 12.5-14.5 V Go to Step 5  Go to Step 4 
4  Inspect the lock solenoid battery positive circuit for an open, a short to ground, or a high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Step 5 
5 
  1. Disconnect the transfer case encoder motor connector.
  2. Check the internal resistance of the lock solenoid.
Is the resistance within the specified values?		 15-25 Ω Go to Step 6  Go to Step 9 
6  At the encoder motor pigtail check the 8 lock solenoid windings for an internal short to ground, by probing the lock solenoid control with a DMM and taking the other lead to ground.
Did the DMM indicate a short to ground?		 - Go to Step 9  Go to Step 7 
7 
  1. Disconnect the transfer case shift control module.
  2. With a DMM, test the lock solenoid control circuit for a short to ground, a short to voltage or a high resistance.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 8 
8  Check all connectors for corrosion or damage. Refer to Connector Repairs .
Did you find and correct the condition?		 - Go to Step 11  Go to Step 10 
9 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 11  -
10 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 11  -
11
  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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