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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 P07A9 >> 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. Perform the Transmission Fluid Level and Condition Check  to verify correct fluid level.
  2. Perform the Line Pressure Check  to verify correct oil pressure.
  3. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection  to verify Q8 control solenoid valve assembly condition.
  4. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test  to verify Q8 control solenoid valve assembly function.
  5. Inspect the hybrid low, 1-2 clutch boost valve assembly for sticking or damage.
    • If you found a concern with the hybrid low, 1-2 clutch boost valve assembly, repair or replace the valve or valve body.
  6. Inspect the 1-3 clutch assembly for a stuck ON or damaged condition.
    • If you found a 1-3 clutch assembly concern, repair or replace the 1-3 clutch assembly as necessary.
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