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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 56 (Automatic Transmission - 6L90 (MYD) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0776 or P0777 >> Diagnostic Fault Information

Diagnostic Fault Information

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

The components are listed from the least to the most intrusive to service.

Component DTC Condition
Q8 Control Solenoid Valve Assembly P0776, P0777
  • Q27B Pressure Control Solenoid Valve 2 - Binding or Sticking/Stuck
  • Control Solenoid Valve Assembly Filter Plate - Blocked or Cracked
  • O-Ring - Leaking
Control Valve Body P0776, P0777
  • Clutch Regulator Valve - Binding or Sticking/Stuck
  • Control Valve Body Ball Check Valve - Leaking or Blocked by debris

    Oil Channels or Orifices - Restricted
Control Valve Body Spacer Plate P0776 Oil Channels or Orifices - Restricted
Control Valve Channel Plate P0776 Oil Channels or Orifices - Restricted
3-5-R and 4-5-6 Clutch Housing Assembly P0776
  • 3-5-R Clutch Backing Plate Retaining Ring - Not seated correctly
  • 3-5-R clutch plates worn or damaged.
  • Clutch Housing - Scored/Worn
  • Clutch Piston
    • Cracked
    • Damaged seal.
Torque Converter with Fluid Pump Housing Assembly P0776, P0777
  • Oil Pump Drive Gear - Worn
  • Oil Pump Driven Gear - Worn
  • Transmission Fluid Pump Housing - Scored/Worn
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