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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 29 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - DTC P0218 To DTC P0785) >> DTC P0724 (M33 Only) >> Test Description

Test Description

WARNING: This page is about a different variant/trim than selected.

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

  1. 2:  This step isolates the brake switch as a source for setting the DTC.
DTC P0724 (M33 Only)

Step Action Values Yes No
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
    3. IMPORTANT: Before clearing the DTC, use the scan tool in order to record the Failure Records. Using the Clear Info function erases the Failure Records from the PCM.
  3. Record the DTC Failure Records.
  4. Clear the DTC.
  5. Select TCC Brake Switch on the scan tool.
    6. CAUTION: Refer to SIR Caution .
  6. Disconnect the brake switch connector from the brake switch.
Did the TCC Brake Switch status change from Closed to Open?		 - Go to Step 3  Go to Step 4 
3 Replace the brake switch.
Refer to Stop Lamp Switch Replacement .
Did you complete the replacement?		 - Go to Step 6  -
4
IMPORTANT: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics for complete circuit distribution.
Test the signal circuit of the brake switch for a short to voltage.Refer to Testing for a Short to Voltage and Wiring Repairs .Did you find and correct the condition?		 - Go to Step 6  Go to Step 5 
5 Replace the PCM.
Refer to Control Module References .
Did you complete the replacement?		 - Go to Step 6  -
6 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear Info.
  3. Turn ON the ignition, with the engine OFF.
  4. Apply and release the brake pedal.
  5. Verify that the scan tool TCC Brake Switch status indicates Open, 0 volts, for 2 seconds.
  6. Select Specific DTC.
  7. Enter DTC P0724.

Has the test run and passed?		 - Go to Step 7  Go to Step 2 
7 With the scan tool, observe the stored information, capture info, and DTC Info.
Does the scan tool display any DTCs that you have not diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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