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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:  Measures the resistance across the encoder motor lock.
  2. 3:  Tests the Transfer Case Lock circuit for a short to voltage.
DTC C0324

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 
  1. Turn the ignition OFF.
  2. Disconnect the encoder motor.
  3. Measure the resistance across the encoder motor lock control solenoid using a DMM.
Is the resistance reading within the specified values?		 18-25 Ω Go to Step 3  Go to Step 5 
3 
  1. Turn the ignition OFF.
  2. Disconnect the transfer case shift control module.
  3. With the encoder motor still disconnected turn the ignition ON, with the engine OFF.
  4. Probe the Transfer Case Lock circuit of the encoder motor brake control with a test lamp that is connected to a good ground.
Does the test lamp illuminate?		 - Go to Step 4  Go to Step 6 
4 Repair the Transfer Case Lock circuit for a short to voltage. Refer to WIRING REPAIRS in Wiring Systems.
Is the repair complete?		 - Go to Step 7  -
5 Replace the encoder motor. Refer to Transfer Case Motor/Encoder Replacement .
Is the repair complete?		 - Go to Step 7  -
6 Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement .
Is the repair complete?		 - Go to Step 7  -
7
  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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