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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 113 (Engine Controls And Fuel - 4.3L (LV1) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P0446 >> Circuit/System Verification

Circuit/System Verification

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. Verify DTC P0449 is not set.
    • Go to next step: If DTC P0449 is not set 
  3. Ignition/Vehicle - Off
  4. Remove the component: Fuel Tank Filler Cap or Install the special tool: GE-41415-60 Engine Induction System Leak Test Adapter/Capless Fuel Fill Adapter - Capless Type Fuel Fill
  5. Verify the scan tool parameter: Fuel Tank Pressure Sensor = 1. 3 to 1. 7 V
    • Go to next step: If between 1. 3 and 1. 7 V 
  6. Install the component: Fuel Tank Filler Cap or Remove the special tool: GE-41415-60 Engine Induction System Leak Test Adapter/Capless Fuel Fill Adapter - Capless Type Fuel Fill
  7. Engine - Idling - At normal operating temperature
  8. Perform the scan tool function: EVAP Purge/Seal EVAP Purge Solenoid Valve - 50% - Perform the action while monitoring the parameter: Fuel Tank Pressure Sensor
  9. Verify the scan tool parameter: Fuel Tank Pressure Sensor = Less than 2. 5 V
    • If 2. 5 V or greater 

      Refer to: Circuit/System Testing

    • Go to next step: If less than 2. 5 V 
  10. 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 Circuit System Testing.

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