Trouble codes › P0449
P0449 Evaporative Emission System Vent Valve/Solenoid Circuit
EVAP
P0449 means there's an electrical fault in the EVAP vent valve circuit.
The engine computer found an electrical fault in the EVAP vent valve circuit (open, shorted or no response).
Safe to drive. It affects emissions and sometimes refueling.
Common causes
- A failed vent valve solenoid
- A corroded connector near the fuel tank (road splash)
- Damaged wiring
Symptoms
- Check-engine light
- Sometimes trouble filling the tank
Common on: Chevrolet Silverado 1500, GMC Sierra 1500, Chevrolet Tahoe, Chevrolet Suburban, GMC Yukon
What to check first
- Inspect the vent valve's connector and wiring under the car.
- Measure the solenoid's resistance.
- Check for power at the connector.
- Replace the valve if needed.
What does P0449 mean on your vehicle?
The likely cause depends on your engine. iRepair researches your exact year, make, model and engine (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.
Ask iRepair about P0449No scanner? Most auto parts stores read check-engine codes for free.
Related codes
General guidance for P0449 on most vehicles. Some makers use the same code a little differently; confirm in the service information for your vehicle, put safety first, and see a professional when in doubt.