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P0449 Buick Code - Evaporative Emission Vent Solenoid Valve Control Circuit

- Code Popularity: 43,464 Views
- Repair Importance Level: 1/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P0449 Buick?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Evaporative Emission Vent Solenoid Valve
  • Evaporative Emission Vent Solenoid Valve harness is open or shorted
  • Evaporative Emission Vent Solenoid Valve electrical circuit poor connection
  • Faulty Engine Control Module (ECM)
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How to Fix the DTC P0449 Buick?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0449 Buick code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P0449 Buick Description

The Evaporative Emission (EVAP) Vent Solenoid Valve is located on the EVAP canister and is used to seal the canister vent. The Evaporative Emission Vent Solenoid Valve responds to signals from the Engine Control Module (ECM). Battery voltage is supplied to the EVAP vent solenoid valve through a fuse. The ECM grounds the EVAP Vent Solenoid Valve control circuit through an internal switch called a driver. A plunger will then move to seal the canister vent. The ability to seal the vent is necessary for the on board diagnosis of other evaporative emission control system components. The ECM monitors the status of the driver. A scan tool will display the commanded state of the EVAP Vent Solenoid Valve as Not Venting (On) or Venting (Off). The Diagnostic Trouble Code (DTC) will be set when the ECM detects the EVAP vent solenoid valve control circuit is open within 0.25 s.
OBDII Code P0449 Buick - Evaporative Emission Vent Solenoid Valve Control Circuit - AutoCodes.com
P0449 Buick Code - Evaporative Emission Vent Solenoid Valve Control Circuit

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