Codes P0449 and P0455

2019 CHEVROLET SILVERADO
35,500 MILES • 4.3L • 6 CYL • 4WD • AUTOMATIC
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WILLIAM8588
  • MEMBER
  • 1 POST
I changed out the Vapor Control Valve Canister and I still have the error code.

Any advice?
May 31, 2022 at 6:08 AM
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SQM
  • ASE Certified Mechanic
  • 6,383 POSTS
  • ASE Certified Mechanic
Hello,

The code
P0449 Evaporative Emission (EVAP) Vent Solenoid Valve Control Circuit
P0455 Evaporative Emission (EVAP) System Large Leak Detected

These can get triggered due to faulty components, any leak within the EVAP system or wiring issues.

https://www.2carpros.com/articles/evap-system-code-repair

I have attached the troubleshooting steps for these codes below. Follow those steps as that can help you determine the issue.

Let me know of any questions.
Thank you.
May 31, 2022 at 9:28 AM
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