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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 143 (Automatic Transmission - 4L80-E/4L85-E - DTC P0218 To DTC P0976) >> DTC P0724 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 GMC Yukon XL and 2007 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

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

Step Action 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 ECM and TCM Failure Records. Using the Clear Info function erases the Failure Records from the ECM.
  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 on the scan tool change from Closed to Open?		 Go to Step 3  Go to Step 4 
3 Replace the brake switch. Refer to Stop Lamp Switch Replacement (Adjustable Pedal) or Stop Lamp Switch Replacement (Non-Adjustable Pedal) .
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 stop lamp supply voltage signal circuit of the brake switch for a short to voltage between the stop lamp switch and fuse block-body or fuse block-body and TCM. 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 TCM. Refer to Control Module References for replacement, setup, and programming.
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 the brake pedal.
  5. Verify that the scan tool TCC Brake Switch status indicates Open, 0 volts, for 5 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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