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Home >> Chevrolet >> 2021 >> Trailblazer RS, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Automatic Transmission - VT40 (MRG) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0964-P0968, P0970, P0971, P2670, P2671, P2727, P2729, or P2730 >> Component Testing

Component Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle - Off
  2. Remove the component: Control Valve Body
  3. Disconnect the appropriate electrical connector: Q77 Transmission Control Solenoid Valve
    4. NOTE:

    The component's temperature should be 20 to 22°C (68 to 72°F) while testing.

  4. Test for 4.5 to 6.5 ohms between the test points: Terminal 1 & Terminal 2 @ Q77 Transmission Control Solenoid Valve
    • If not in the specified range 

      Replace the component: Q77 Transmission Control Solenoid Valve

    • Go to next step: If in the specified range 
  5. Test for infinite resistance between the test points: Each terminal of the component & The component's housing
    • 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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