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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 82 (Automatic Transmission Diagnosis - ALLISON) >> Diagnostic Tests >> DTC P0742: Torque Converter Clutch System Stuck On >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Chock the wheels to prevent vehicle movement. Start the engine. Apply vehicle brakes and place gearshift lever in Drive position. Did the engine stall? If so, go to next step. If not, see DIAGNOSTIC AIDS .
  3. Remove the dipstick and inspect the transmission fluid for clutch debris or burnt odor. If necessary, drain a small amount of fluid for this inspection. Was clutch debris present or was there a burnt odor? If so, go to step  5. If not, go to next step.
  4. This condition indicates that the TCC is mechanically stuck on, check for the following conditions:
    • Faulty solenoid "F".
    • Stuck or sticking TCC valve.
    • Restricted transmission cooler lines.

    Was a condition found and repaired? If so, go to step  6.

  5. Burnt or contaminated fluid is an indication that internal damage has occurred. Remove and replace or rebuild the transmission. Is the rebuild or replacement complete? If so, go to next step.
  6. Perform the following procedure to verify the repair:
    • Clear the DTC.
    • Drive the vehicle under normal operating conditions.
    • Using the scan tool, monitor TCC slip speed. The TCC must engage and disengage when commanded.

    Did the DTC return? If so, go to step  1. If not, system is okay.

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