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Home >> GMC >> 2005 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 207 (Automatic Transmission - 5L40-E/5L50-E - (DTC P0115 To DTC P0756)) >> DTC P0742 >> Test Description

Test Description

WARNING: This page is about a different car, the 2005 Cadillac STS. 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:  This step verifies that the TCM commanded the TCC PWM solenoid valve OFF and the slip speed is -20 to +150 RPM.
  2. 3:  This step inspects and repairs the components that caused the DTC to set.
DTC P0742

Step Action Value(s) Yes No
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
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 Freeze Frame and the TCM Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the ECM and the TCM.
    • Using the Clear Info function erases stored DTCs in both the ECM and TCM.
  3. Record the DTC Freeze Frame and Failure Records.
  4. Clear the DTC.
  5. Select TCC Duty Cycle and TCC Slip Speed on the scan tool.
  6. Drive the vehicle in D, with the throttle angle greater than 15 percent. Allow the transmission shift to 5th gear.
While the TCC duty cycle is 0 percent, does the scan tool display a TCC slip speed within the specified range?		 -20 to +20 RPM Go to Step 3  Go to Intermittent Conditions in Engine Controls - 3.6L or Intermittent Conditions in Engine Controls - 4.6L
3 
  1. Inspect for the following conditions:
  2. Repair or replace components as necessary.
Did you find and correct a condition?		 - Go to Step 4  -
4 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear Info.
  3. Operate the vehicle under the following conditions:
    • Drive the vehicle in D with the throttle angle of 15-90 percent and a vehicle speed greater than 15 km/h (9 mph).
    • The TFT is 20-130°C (68-266°F).
    • The engine torque is greater than 80 N.m (59 lb ft).
    • The TCC slip speed must be 130-1,500 RPM for 2.5 seconds.
    • Stop the vehicle.
    • Drive the vehicle, as noted in Steps 1-3 above, in order to cycle the TCC a second time.
  4. Select Specific DTC.
  5. Enter DTC P0742.

Has the test run and passed?		 - Go to Step 5  Go to Step 2 
5 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 in Vehicle DTC Information System OK
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