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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (Transfer Case - NVG 246-NP8 - Service & Diagnosis) >> Diagnostic Information and Procedures >> DTC C0300 >> Test Description

Test Description

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The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step tests to see if the malfunction is intermittent.
  2. 3:  This step tests the internal resistance of the propshaft speed sensor.
  3. 4:  This step tests to see if the propshaft speed sensor can generate a sufficient amount of AC voltage.
  4. 5:  This step tests the rear speed sensor low circuit for a short to ground, a high resistance, or an open.
  5. 6:  This step tests the rear speed sensor high circuit for a short to ground, a high resistance or an open.
  6. 7:  This step tests the rear speed sensor low circuit for a short to voltage.
  7. 8:  This step tests the rear speed sensor high circuit for a short to voltage.
  8. 9:  This step tests the rear speed sensor low circuit for a short to the rear speed sensor high circuit.
DTC C0300

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. Drive the vehicle for a short test drive.
  2. While driving, use a scan tool in order to observe the value of the Rear Propshaft Speed parameter.
Does the RPM value vary, or become intermittent while driving at a steady speed?		 - Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3
  1. Turn the ignition OFF.
  2. Disconnect the transfer case rear propshaft speed sensor.
  3. Measure the resistance of the transfer case rear propshaft speed sensor.
Is the resistance reading within the specified values?		 1,300-2,700 Ω Go to Step 4  Go to Step 10 
4
  1. Connect a DMM to the transfer case rear propshaft speed sensor.
  2. Block the front wheels.
  3. Place the transmission in neutral.
  4. Raise and support the rear axle so that the wheels turn freely. Refer to Lifting and Jacking the Vehicle .
  5. Hold one rear wheel while rotating the other rear wheel.
  6. Observing the AC voltage reading on the DMM
Is the voltage reading greater than the specified value?		 0.5 V AC Go to Step 5  Go to Step 10 
5
  1. Disconnect the transfer case shift control module.
  2. Test the rear speed sensor low signal circuit for a short to ground, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 6 
6 Test the rear speed sensor high signal circuit for a short to ground, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 7 
7 Test the rear speed sensor low signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 8 
8 Test the rear speed sensor high signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 9 
9 Test the rear speed sensor high signal circuit for a short to the rear speed sensor low signal circuit. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 11 
10 Replace the transfer case rear propshaft speed sensor. Refer to Transfer Case Speed Sensor Replacement - Right Rear .
Did you complete the repair?		 - Go to Step 12  -
11 Replace the transfer case shift control module. Refer to Control Module References for replacement, setup, and programming.
Did you complete the repair?		 - Go to Step 12  -
12
  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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