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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 P2817 or P2818 >> 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 P2817, P2818 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
Q77H Transmission Control Solenoid Valve 8 P2817, P2818
  • Binding, sticking or stuck component: Solenoid Valve
  • Damaged or missing component:
    • Retaining Clip
    • Solenoid Valve
Default Valve P2817, P2818
  • Blocked or restricted component: Screen - Fluid/oil passage
  • Binding, sticking or stuck component: Valve
  • Debris on the component.
  • Damaged component:
    • Valve or Bore - Scored
    • Spring
  • Leaking component:
    • Gasket
    • O-Ring
    • Seal
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