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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 P2714 or P2715 >> 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 P2714 or P2715. Carefully inspect each component for that condition. Repair or replace as necessary.
DTC P2714 or P2715

DTC Component Condition
P2714
P2715		 Control Valve Upper Body Assembly (304) 2-6 clutch regulator valve (334) stuck / sticky - debris, binding, damaged valve, or scored bore
P2714 Q8 Control Solenoid Valve Assembly (314) Refer to document PIP 4304A. DTC P2714 may be set with DTC P0878
P2714
P2715		 Q8 Control Solenoid Valve Assembly (314)
  • Control signal fluid supply leak - valve body filter plate assembly cracked or damaged gasket seal
  • O-ring seals leaking
P2714
P2715		 Center (w/2-6 and Low/Rev Clutch) Support Assembly (67)
  • 2-6 clutch return spring retaining ring (455) not seated in groove
  • 2-6 clutch piston assembly - seal damaged or leaking
  • 2-6 clutch plates (451-453) worn or damaged
  • Center support transfer seal assembly (20) incorrectly installed
P2714 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 correctly
  • 1-2-3-4 clutch piston (414) - seals damaged or leaking
  • 1-2-3-4 clutch piston (414) - cracked or damaged
P2714 4-5-6 (w/turbine shaft) Clutch Assembly (56)
  • Turbine shaft fluid seal rings (442) damaged or leaking
  • 4-5-6 clutch piston assembly (439) - seals damaged or leaking
P2714 A/Trans Fluid Pump Cover Assembly (219) Pump tower seals (230) damaged or leaking
P2714 Torque Converter (w/fluid pump) Housing Assembly (2) Fluid pump housing / vanes / rotor / slide damaged / scored
P2714 A/Trans Fluid Filter Assembly (26) Oil filter (26) or filter seal (25) loose or damaged
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