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Home >> GMC >> 2018 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls And Fuel - 1.5L (LYX) - Diagnostic Information And Procedures (P0351 - P26C8) And Symptoms) >> Diagnostic Information And Procedures >> DTC P2261: Turbocharger Bypass Valve Stuck >> Component Testing

Component Testing

WARNING: This page is about a different variant/trim than selected.

Static Test

  1. Ignition Off, disconnect the harness connector at the Q40 turbocharger bypass solenoid valve.
  2. Test for 10 - 14 Ω between the control terminal 2 and the Ignition terminal 1 of the Q40 turbocharger bypass solenoid valve.
    • If not between 10 - 14 Ω 

      Replace the Q40 turbocharger bypass solenoid valve.

    • Go to next step: If between 10 - 14 Ω 
  3. All OK

Dynamic Test

  1. Install a 15 A fused jumper wire between the ignition terminal 2 of the Q40 turbocharger bypass solenoid valve and 12 V. Install a jumper wire between the control terminal 1 and ground.
  2. Verify the Q40 turbocharger bypass solenoid valve plunger retracts.
    • If the plunger does not retract. 

      Replace the Q40 turbocharger bypass solenoid valve.

    • Go to next step: If the plunger retracts. 
  3. All OK
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