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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 62 (Automatic Transmission - 8L45 (M5N) - 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 2022 Cadillac CT4. 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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