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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 505 (Automatic Transmission - 2ML70 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0776 or P0777 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that DTCs P0721, P0722, P0723, P0966, P0967, P0969, P0970, P0971, P0973, P0974, P0976, P0977, P2720, P2721, P2728, P2729, or P2730 are not set.
  2. Perform the Transmission Fluid Level and Condition Check  procedure.
  3. Perform the Line Pressure Check  procedure.
    • If the pressure is out of specification, correct this concern first.
  4. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .
    • If a concern is found, repair or replace the Q8 control solenoid valve assembly.
  5. 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 Q8 control solenoid valve assembly.
  6. Inspect the control valve upper body assembly for sticking valves, damage, scored bores, or debris.
    • If a concern is found in the valve body, repair or replace the valve body as necessary.
  7. Inspect the hybrid direct, 2-3-4 clutch assembly for damage.
    • If a concern is found in the hybrid direct, 2-3-4 clutch assembly, repair or replace as necessary.
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