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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Automatic Transmission - 10L80 (MF6) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P0776 Or P0777: Transmission Control Solenoid Valve 2 Stuck Off/On >> Diagnostic Fault Information

Diagnostic Fault Information

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NOTE:
  • DTC P0776, P0777 sets only when there is a hydraulic/mechanical problem.
  • The components are listed from the least to the most intrusive to service.
  • Verify the conditions listed in the table do not exist:
Component DTC Condition
Q77B Transmission Control Solenoid Valve 2 P0776, P0777
  • Binding, sticking or stuck component:Solenoid Valve
  • Damaged or missing component:
    • Retaining Clip
    • Solenoid Valve
  • 1-2-8-9-10-Reverse Clutch Regulator Valve
  • Valve Spring
  • Valve Body Bore
 P0776, P0777
  • Binding, sticking or stuck component:Valve
  • Debris on the component.
  • Damaged component:
    • Valve or Bore - Scored
    • Spring
1-2-8-9-10-R Clutch Assembly - Oil Feed Circuit P0776, P0777 Blocked or restricted component:Screen
1-2-8-9-10-R Clutch Assembly P0776, P0777
  • Blocked or restricted component:Fluid/oil passage
  • Leaking component:
    • Clutch Piston
    • Clutch Housing
    • Gasket
    • O-Ring
    • Seal
  • Binding, sticking or stuck component:Clutch Plates
  • Damaged or worn component:
    • Clutch Plates
    • Clutch Piston
    • Clutch Housing
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