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Test Description

WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 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:  Tests for proper voltage and grounds.
  2. 3:  Listen for an audible motor noise when the encoder motor operates. Command both the ON and OFF states. Repeat the commands as necessary.
  3. 4:  Tests Motor Feed A or the transfer case shift control module for a short to voltage.
  4. 5:  Tests Motor Feed B or the transfer case shift control module for a short to voltage.
  5. 6:  Tests Motor Feed A circuit for a short to voltage.
  6. 7:  Tests Motor Feed B circuit for a short to voltage.
DTC C0309

Step Action Value(s) Yes No
Schematic Reference:  Transfer Case Control Schematics  
1 Was the Transfer Case Diagnostic System Check performed? - Go to Step 2  Go to Diagnostic System Check - Transfer Case 
2  Check the transfer Case shift control module for faulty power or grounds. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Was the condition found and corrected?		 - Go to Step 9  Go to Step 3 
3 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With the scan tool, command the Motor A/B control ON and OFF.
Does the encoder motor turn ON and OFF?		 - Go to TESTING FOR INTERMITTENT AND POOR CONNECTIONS in Wiring Systems Go to Step 4 
4 
  1. Turn the ignition OFF.
  2. Disconnect the four wire connector at the transfer case.
  3. Turn the ignition ON, with the engine OFF.
  4. Connect a DMM between the Motor Control A circuit harness connector and ground at the transfer case.
Is the voltage reading within the specified value?		 0-0.2 V Go to Step 5  Go to Step 6 
5  Connect a DMM between the Motor Control B circuit harness connector and ground at the transfer case.
Is the voltage reading within the specified value?		 0-0.2 V Go to Step 8  Go to Step 7 
6 
  1. Disconnect the transfer case shift control module.
  2. Test the Motor Control A circuit harness connector for a short to voltage. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Was the condition found and corrected?		 - Go to Step 9  Go to Step 8 
7 
  1. Disconnect the transfer case shift control module.
  2. Test the Motor Control B circuit harness connector for a short to voltage. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Was the condition found and corrected?		 - Go to Step 9  Go to Step 8 
8 Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement .
Is the repair complete?		 - Go to Step 9  -
9
  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 reset?		 - Go to Step 2  System OK
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