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Home >> GMC >> 2020 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls And Fuel - 1.5L (LYX) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P2261 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition/Vehicle - Off
  2. Remove the component:Q40 Turbocharger Bypass Solenoid Valve - Leave the electrical connector connected.
  3. Perform the scan tool control function:Turbocharger Bypass Solenoid Valve - On & Off

    Verify the component opens and closes:Q40 Turbocharger Bypass Solenoid Valve

    • If the component does not open and close 

      Replace the component:Q40 Turbocharger Bypass Solenoid Valve

    • Go to next step: If the component opens and closes 
  4. Verify a condition does not exist with the component:Turbocharger - Refer to:Compressor Air Intake Turbocharger Cleaning and Inspection
    • If a condition exists 

      Repair or replace as necessary.

    • Go to next step: If no condition exists 
  5. Replace the component:Q40 Turbocharger Bypass Solenoid Valve
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