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Home >> Buick >> 2019 >> Regal TourX Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 138 (Engine Controls And Fuel - 3.6L (LGX) - Diagnostic Information And Procedures (P0010-P0446)) >> Diagnostic Information and Procedures >> DTC P0442 or P0455 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:

Refer to: Fuel and Evaporative Emission Pipe Warning .

CAUTION:

Refer to: Clean, Dry, Low Pressure Gas Source Caution .

  1. Verify the following conditions do not exist:
    • Damaged, defective, or loose component:
      • Fuel Tank Filler Cap or Capless Type Fuel Fill
      • Evaporative Emission Canister Purge Solenoid Valve
      • Evaporative Emission Pipe - Kinked or Disconnected
      • EVAP Vent Solenoid Valve
      • Evaporative Emission Canister
      • If a condition exists - Repair or replace as necessary
      • Go to next step: If no condition exists
  2. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  3. Verify the DTC does not set..
    • If the DTC sets 

      Refer to: Circuit/System Testing

    • Go to next step: If the DTC does not set 
  4. All OK.
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