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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 P2723 or P2724 >> 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 DTCs P2723 or P2724. Carefully inspect each component for that condition. Repair or replace as necessary.
DTC P2723 or P2724

DTC Component Condition
P2723
P2724		 Control Valve Upper Body Assembly (304) 1-2-3-4 Clutch Regulator Valve (337) stuck / sticking - debris, binding, damaged valve, or scored bore
P2723 Q8 Control Solenoid Valve Assembly (314) Refer to document PIP 4304A. DTC P2723 may be set with DTC P0878
P2723
P2724		 Q8 Control Solenoid Valve Assembly (314)
  • O-ring seals leaking
  • Valve body filter plate assembly cracked, blocked, or damaged gasket seal
P2723 Control Valve Upper Body Assembly (304) Clutch Select Valve 3 (352) stuck / sticking - debris, binding, damaged valve, or scored bore
P2723 A/Trans Fluid Pump Cover Assembly (219) Pump Tower Seals (230) damaged / leaking
P2723 1-2-3-4 and 3-5-R Clutch Housing Assembly (51) 1-2-3-4 Clutch Piston (414) cracked / damaged / leaking
P2723 1-2-3-4 and 3-5-R Clutch Housing Assembly (51) Housing / hub weld cracked / leaking
P2723 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
P2723 Control (with body and valve) Valve Assembly (21) Valve Body to Pump Transfer Seal Assembly (19) damaged / leaking
P2723 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 temperatures
P2723 Automatic Transmission Fluid Filter Assembly (26) Oil filter (26) or filter seal (25) loose or damaged
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