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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:  Helps determine if the transfer case speed sensors are working properly.
  2. 3:  Tests to see if the DTC will reset.
  3. 4:  Inspects for mismatches and whether speed sensors are wired correctly.
  4. 5:  Inspects the transfer case for mechanical failures.
DTC C0376

Step Action Yes No
Schematic Reference:  Transfer Case Control Schematics  
1
IMPORTANT: If DTC C0300 or C0305 is also present perform the diagnostic for DTC C0300 before continuing.
Was the Transfer Case Diagnostic System Check performed?		 Go to Step 2  Go to Diagnostic System Check - Transfer Case 
2 
  1. Clear all ATC DTCs.
  2. Place the transfer case into 4 WD mode.
  3. Connect a scan tool.
  4. Monitor both the front and rear propshaft speed sensors while driving the vehicle.
Are both propshaft speed sensors within 10 percent of each other?		 Go to Step 3  Go to Step 4 
3  Does the DTC C0376 reset? Go to Step 6  Go to TESTING FOR INTERMITTENT AND POOR CONNECTIONS in Wiring Systems
4 
  1. Turn the ignition OFF.
  2. Inspect the following for a mismatch:
    • Front and rear axle ratios
    • All tires
    • Front or rear propshaft missing
  3. Inspect that the speed sensors are wired correctly by comparing vehicle wire harness to the system schematics.
  4. Inspect the connectors for proper connection and for loose terminals.
Was a problem found and corrected?		 Go to Step 7  Go to Step 5 
5  Inspect the transfer case for a mechanical failure.
Has a mechanical failure been identified and repaired?		 Go to Step 7  Go to Step 6 
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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