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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 506 (Automatic Transmission - 6L80/6L90 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0796 or P0797 >> Circuit/System Testing

Circuit/System Testing

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  1. Verify the transmission line pressures are within the specified ranges. Refer to Line Pressure Check .
    • If the line pressures are within the specified ranges 
  2. Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .
  3. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test . Test all solenoids on the Q8 control solenoid valve assembly. A pressure change should occur for each solenoid valve.
    • If a pressure change does not occur for each solenoid 

      Replace the Q8 control solenoid valve assembly.

    • If a pressure change occurs for each solenoid 
  4. Listed in the chart below, are conditions for each component that could set DTC P0796 or P0797. Carefully inspect each component for that condition. Repair or replace as necessary.
DTC P0796 or P0797

DTC Component Condition
P0796
P0797		 Control Valve Upper Body Assembly (304) 4-5-6 Regulator Valve (327) stuck / sticking - debris, binding, damaged valve, or scored bore
P0796 4-5-6 Clutch Housing Assembly (441) Turbine Shaft Seals (442) damaged or leaking
P0796
P0797		 Q8 Control Solenoid Valve Assembly (314)
  • O-ring seals leaking
  • Valve body filter plate assembly cracked, blocked or damaged gasket seal
P0796
P0797		 Control Valve Lower Body Assembly (307) Clutch select valve (352) stuck / sticking - debris, binding, damaged valve, or scored bore
P0796 4-5-6 Clutch Housing Assembly (441) 4-5-6 Clutch Piston Assembly (439) damaged / leaking
P0796 Transmission Cooling / Lubrication
  • Restriction / leak in OAC (oil to air) cooler / radiator
  • Restricted / leaking / kinked / damaged transmission oil cooler lines
  • Restriction / leak in transmission fluid pump assembly
P0796 Torque Converter (w/Fluid Pump) Housing Assembly (2)
  • Fluid pump housing vanes / rotor / slide damaged / scored
  • Fluid pump or torque converter overstressed due to high temperature
P0796 4-5-6 Hub / Shaft Assembly (58) 4-5-6 Hub / Shaft - broken hub weld
P0796 Automatic Transmission Fluid Filter Assembly (26) Oil filter (26) or filter seal (25) loose or damaged
P0796 1-2-3-4 and 3-5-R Clutch Housing Assembly (51) 1-2-3-4 Clutch Backing Plate Retaining Ring (429) not seated / oriented, causing clutch pack / piston over travel
P0796 Control (with body and valve) Valve Assembly (21) Valve Body to Pump Transfer Seal Assembly (18) damaged / leaking
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