LEMON Manuals: Even more car manuals for everyone
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 >> Circuit/System Testing

Circuit/System Testing

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.
  1. Verify the condition does not exist: Incorrect pressure - Refer to: Line Pressure Check 
    • Go to next step: If no condition exists 
  2. Ignition/Vehicle - Off
  3. Remove the component: Q8 Control Solenoid Valve Assembly
  4. Verify the procedure/test passes. - Refer to: Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test 
    • If the procedure/test does not pass 

      Replace the component: Q8 Control Solenoid Valve Assembly

    • Go to next step: If the procedure/test passes 
  5. Refer to: Diagnostic Fault Information
scientia non olet · About LEMON Manuals