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Home >> Cadillac >> 2019 >> ATS V >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 8L45 (M5N M5T) Or 8L90 (M5U) - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P2808 or P2809 >> Diagnostic Fault Information

Diagnostic Fault Information

NOTE:
  • DTC P2808 will set with a hydraulic/mechanical condition.
  • DTC P2809 will set with a hydraulic/mechanical condition or high resistance in the circuit of the component Q77G without setting component/control circuit DTCs.
  • 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