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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 2.7L (L3B) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P2261 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle - Off
  2. Remove the component: Q40 Turbocharger Bypass Valve Solenoid - Leave the electrical connector connected.
  3. Perform the scan tool control function: Turbocharger/Supercharger Bypass Valve - Increase & Decrease

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

    • If the component does not open and close 

      Replace the component: Q40 Turbocharger Bypass Valve Solenoid

    • 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 Overhaul
    • If a condition exists 

      Repair or replace as necessary

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