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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 6L50/6L80/6L90 - DTC P0218 To DTC P0971 >> DTC P0796 or P0797 >> Circuit/System Testing

Circuit/System Testing

  1. Perform the Line Pressure Check .
    • If the pressure is out of specification, correct this concern first.
  2. Perform the Control Solenoid Valve and Transmission Control Module Assembly Cleaning and retest the DTC as outlined in the Circuit/System Verification steps.
    • If the DTC resets, continue on with testing.
  3. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .
    • If a concern is found, repair or replace the control solenoid (w/body and TCM) valve assembly.
  4. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .
    • If the solenoid is found to be leaking or stuck closed, replace the control solenoid (w/body and TCM) valve assembly.
  5. Inspect the control valve upper body assembly for sticking valves, damage, scored bores, or debris.
    • If a concern if found in the valve body, repair or replace the valve body as necessary.
  6. Inspect the low and reverse/4-5-6 clutch assembly for damage.
    • If a concern is found in the low and reverse/4-5-6 clutch assembly, repair or replace as necessary.
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