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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 6L50/6L80/6L90 - DTC P0218 To DTC P0971 >> DTC P0756 >> Diagnostic Fault Information

Diagnostic Fault Information

The following fault table will help determine if a hydraulic circuit or an incorrect position or application of a component affects the transmission operation.

Component Cause DTCs
Lower Control Valve Body Clutch select valve 3 stock - debris, sediment, binding or scored bore P0756
1-2-3-4 and 3-5-R Clutch Housing Assembly 1-2-3-4 clutch backing plate retaining ring not seated, causing the piston to over-travel and cut 1-2-3-4 clutch piston seal P0756
Control Solenoid (w/body and TCM) Valve Assembly Clutch Pressure Control Solenoid 2:
  • Not exhausting - Stuck Off
  • Needle piston or armature pin binding
  • Control signal fluid supply leak - valve body filter plate assembly cracked or damaged gasket seal
  • O-ring seals leaking
 P0756
Center Support Assembly Lube hole blocked, incorrectly drilled or omitted P0756
Fluid Pump Cover Assembly Fluid pump cover vanes and fluid pump rotor broken P0756
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