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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 P0449, P0498, or P0499 >> 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. Perform the scan tool control function: EVAP Vent Solenoid Valve - On and Off

    Verify the scan tool parameter:

    • EVAP Vent Solenoid Valve Control Circuit Open Test Status = OK or Not Run
    • EVAP Vent Solenoid Valve Control Circuit Low Voltage Test Status = OK or Not Run
    • EVAP Vent Solenoid Valve Control Circuit High Voltage Test Status = OK or Not Run
    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  3. Perform the scan tool control function: EVAP Vent Solenoid Valve - On and Off

    Verify a click can be heard or felt at the component when the scan tool control function was commanded: Q13 Evaporative Emission Vent Solenoid Valve

    • If a click cannot be heard or felt 

      Refer to: Circuit/System Testing

    • Go to next step: If a click can be heard or felt 
  4. Verify the scan tool parameter:
    • EVAP Vent Solenoid Valve Control Circuit Open Test Status = OK or Not Run
    • EVAP Vent Solenoid Valve Control Circuit Low Voltage Test Status = OK or Not Run
    • EVAP Vent Solenoid Valve Control Circuit High Voltage Test Status = OK or Not Run
    • Perform the action while monitoring the parameter:
    • Wiggle the harness and connector: Q13 Evaporative Emission Vent Solenoid Valve
    • Wiggle the harness and connector: K20 Engine Control Module
    • If not the specified state 

      Repair as necessary - Wiring / Terminal(s) / Electrical Connector(s)

    • Go to next step: If the specified state 
  5. 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.

    Verify the DTC does not set.

    • If the DTC sets 

      Refer to: Circuit/System Testing

    • Go to next step: If the DTC is not set 
  6. All OK.
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