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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 144 (Automatic Transmission - 6L50/6L80/6L90 - DTC P0218 To DTC P0977) >> DTC P0741 or P0742 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Cadillac Escalade EXT, 2007 Cadillac Escalade ESV, and 2007 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform the Control Solenoid Valve and Transmission Control Module Assembly Cleaning in an attempt to clean or free up a potential sticking valve of dirt or debris.
  2. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test to test for a stuck open or stuck closed TCC PC solenoid valve inside of the control solenoid (w/body and TCM) valve assembly.
    • If a stuck open or closed valve is found, replace the control solenoid (w/body and TCM) valve assembly.
  3. Inspect the lower control valve body for a stuck valve, debris or damage.
    • If you found a valve body concern, repair or replace the lower control valve body as necessary.
  4. Inspect the TCC control valve in the pump.
    • If you found a TCC control valve concern, repair or replace the TCC control valve or pump as necessary.
  5. Inspect the torque converter assembly for damage or discoloration.
    • If you found a torque converter assembly concern, replace the torque converter assembly as necessary.
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