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Test Description

WARNING: This page is about a different car, the 2004 GMC Yukon XL and 2004 GMC Yukon. 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 determines if two or more of the 5 volt encoder signal circuits are shorted together.
  2. 3:  This step tests for proper voltage on the four encoder signal circuits.
  3. 4:  This step tests for a short to voltage, open or high resistance on the encoder low reference circuit.
  4. 5:  This step determines which encoder signal circuits are shorted together.
  5. 6:  This step determines if any of the encoder signal circuits have an open or high resistance condition.
  6. 7:  This step determines if a binding shift detent lever shaft is causing the DTC.
DTC C0327

Step Action Value(s) 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 - Transfer Case? - Go to Step 2  Go to Diagnostic System Check - Transfer Case 
2 
  1. Apply the parking brake.
  2. Raise the vehicle on a hoist.
  3. Disconnect the connector at the transfer case.
  4. Turn the ignition ON, with the engine OFF.
  5. Install a scan tool.
  6. While monitoring the encoder channels on the scan tool, short to ground each of the encoder channel circuits on the module side of the harness with a jumper wire.
Do more than one of the four encoder channels indicate OFF when each encoder channel circuit is individually shorted to ground?		 - Go to Step 5  Go to Step 3 
3  At the transfer case connector, test the encoder signal circuits on the module side of the harness with a DMM.
Are the voltages within the specified range?		 4.3-4.7 V Go to Step 4  Go to Step 6 
4  With the ignition in the OFF position, test the encoder low reference circuit for a short to ground, short to voltage, open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 7 
5 
  1. Disconnect C1 and C2 from the transfer case shift control module.
  2. With a DMM, test for two or more encoder signal circuits being shorted together. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 10 
6  Test the suspect circuits for a short to ground, short to voltage, open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 10 
7 
  1. Remove the encoder motor.
  2. Inspect the shift detent lever shaft for a binding condition. Refer to Transfer Case Encoder Motor Replacement .
Did the shift detent lever shaft bind?		 - Go to Step 8  Go to Step 9 
8 Remove the transfer case for disassembly and repair. Refer to Transfer Case Disassemble in Transfer Case - BW 4482-NR4 Unit Repair Manual.
Did you complete the repair?		 - Go to Step 11  -
9 Replace the encoder motor. Refer to Transfer Case Encoder Motor Replacement .
Did you complete the repair?		 - Go to Step 11  -
10 Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement .
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 1  System OK
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