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Home >> GMC >> 2021 >> Terrain SLT, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 91 (Automatic Transmission - 9T45 (M3U) Or 9T50 (M3D M3H) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0658, P0659, P2727, P2729, P2730, P2736, P2738, P2739, P2826, P2827, P282F, or P2830 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2020 GMC Terrain and 2020 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the component: Control Valve Body Cover
  2. Disconnect the appropriate electrical connector: Q77 Transmission Control Solenoid Valve
  3. Test the resistance between the test points: Terminal 1 @ Q77 Transmission Control Solenoid Valve & Terminal 2 @ Q77 Transmission Control Solenoid Valve

    Verify the value is within the range listed in the table: Transmission Solenoid Information

    • If not in the specified range 

      Replace the component: Q77 Transmission Control Solenoid Valve

    • Go to next step: If in the specified range 
  4. Test for infinite resistance between the test points: Terminal 1 @ Q77 Transmission Control Solenoid Valve & Ground
    • If less than infinite resistance 

      Replace the component: Q77 Transmission Control Solenoid Valve

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