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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Automatic Transmission - 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P0658, P0659, P2670, Or P2671: Actuator High Control Circuit Group 1/2 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle - Off
  2. Remove the component: Automatic Transmission Fluid Pan
  3. Disconnect the appropriate electrical connector: Q77 Transmission Control Solenoid Valve - Refer to: Transmission Solenoid Information
    4. NOTE:

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

  4. Test for the resistance listed below between the test points: Control terminal 1 & Control terminal 2
    • Q77 Transmission Control Solenoid Valve - 1, 2, 3, 4, 5, 6, 7 = 4.5 to 5.5 ohms
    • Q77 Transmission Control Solenoid Valve - 8, 9 = 11.0 to 13.0 ohms
    • If the resistance is not within range 

      Replace the component: Q77 Transmission Control Solenoid Valve

    • Go to next step: If the resistance is within range 
  5. Test for infinite resistance between the test points: Each terminal of the component & The component's housing - Q77 Transmission Control Solenoid Valve 1, 2, 3, 4, 5, 6, 7, 8, 9
    • If less than infinite resistance 

      Replace the component: Q77 Transmission Control Solenoid Valve

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