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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 P0658, P0659, P2718, P2720, P2721, P2727, P2729, P2730, P281B, P281D, or P281E >> Component Testing

Component 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.

Static Test

  1. Ignition/Vehicle - Off
  2. Disconnect the appropriate electrical connector: Q77 Transmission Control Solenoid Valve
    3. NOTE:

    The component's temperature should be 19 to 21°C (66 to 70°F) while testing.

  3. Test for the resistance listed below between the test points: Control terminal 1 & Control terminal 2
    • Q77 Transmission Control Solenoid Valve - 4, 5 = 4. 5 to 5. 5 ohms
    • Q77H Transmission Control Solenoid Valve 8 = 11. 0 to 13. 0 ohms
    • If the resistance is not within range 

      Replace the appropriate component: Q77 Transmission Control Solenoid Valve

    • Go to next step: If the resistance is within range 
  4. Test for infinite resistance between the test points: Each terminal of the component & The component's housing - Q77 Transmission Control Solenoid Valve
    • If less than infinite resistance 

      Replace the appropriate component: Q77 Transmission Control Solenoid Valve

    • Go to next step: If infinite resistance 
  5. All OK.
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