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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 P0446 >> 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. Verify a blockage or restriction does not exist in the EVAP system components listed below.

    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. Install any previously removed components.
  3. Remove the component: Fuel Tank Filler Cap - If equipped
  4. Install the special tool: CH-41415-30 Fuel Tank Cap Adapter or Install the special tool: GE-41415-60 Engine Induction System Leak Test Adapter/Capless Fuel Fill Adapter - Capless Type Fuel Fill
  5. Connect the special tool: GE-41413-A / B Evaporative Emissions System Tester (EEST) @ CH-41415-30 Fuel Tank Cap Adapter or GE-41415-60 Engine Induction System Leak Test Adapter/Capless Fuel Fill Adapter
  6. Ignition - On / Vehicle - In Service Mode
  7. Perform the scan tool function: EVAP Purge/Seal - Not Venting
  8. Use the tool to achieve a gauge reading of 1.24 kPa (0.01 bar, 5.0 in H2O). GE-41413-A / B Evaporative Emissions System Tester (EEST) - Nitrogen
    NOTE:

    Do NOT exceed the specified value or incorrect test results may occur.

  9. Perform the scan tool function: EVAP Purge/Seal - Venting
  10. Verify the scan tool parameter: Fuel Tank Pressure Sensor = 0 mmHg (0 in. H2O)
    • If not the specified value 
    1. Ignition/Vehicle - Off
    2. Verify a blockage or a restriction does not exist in the EVAP vent hose or inlet.
      • If a condition exists 

        Repair or replace as necessary.

      • Go to next step: If no condition exists 

        Go to next step: Replace the component: Evaporative Emission Canister Vent Solenoid Valve

    • Go to next step: If the specified value 
  11. 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.
    • If the DTC sets 

      Refer to step 1

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