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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 57 (Automatic Transmission - 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P2808 or P2809 >> 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:
  • DTC P2808, P2809 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
Q77G Transmission Control Solenoid Valve 7 P2808, P2809
  • Binding or Sticking
  • Stuck
  • Visible Damage
Torque Converter Clutch Regulator Valve P2808, P2809
  • Binding or Sticking
  • Debris on the component.
  • Mechanically damaged
  • Restricted/Leaking - Screen or Fluid/oil passage
Torque Converter Clutch Control Valve P2808, P2809
  • Binding or Sticking
  • Debris on the component.
  • Mechanically damaged
Torque Converter P2808, P2809
  • Leaking - Gasket/O-Ring/Seal
  • Binding or Sticking
  • Mechanically damaged
  • Restricted/Leaking - Fluid/oil passage
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