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Home >> Buick >> 2019 >> Regal TourX Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 139 (Engine Controls And Fuel - 3.6L (LGX) - Diagnostic Information And Procedures (P0449-P3436) And Symptoms) >> Diagnostic Information and Procedures >> DTC P0496 >> Circuit/System Testing

Circuit/System Testing

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.
  1. Ignition - On / Vehicle - In Service Mode
  2. Perform the scan tool control function: EVAP Purge/Seal - Not Venting
  3. Engine - Idling
  4. Verify the scan tool parameter: Fuel Tank Pressure Sensor = Less than 1. 7 V - For 90 s
    • If 1. 7 V or greater 

      Replace the component: Q12 Evaporative Emission Purge Solenoid Valve

    • Go to next step: If less than 1. 7 V 
  5. All OK.
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