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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 104 (Engine Controls And Fuel - 6.0L (L96 LC8) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P0496 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. 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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