P0449: owner reports and bulletins

Powertrain (generic, all makes). We haven't written the explanation for this code yet. Below is what owners and manufacturers have filed with NHTSA.

Got P0449 on your scanner? Tell the mechanic your year, make, model and any symptoms and you'll get the likely cause and what to check first. Ask about this code.

What owners report to NHTSA

15 complaints filed with NHTSA mention P0449, 14 of them since 2015, across 11 different models. The component owners most often filed it under: fuel/propulsion system.

Most-reported models

VehicleComplaintsModel years reported
HYUNDAI SONATA32011

Manufacturer service bulletins that name P0449

27 technical service bulletins and manufacturer communications filed with NHTSA mention P0449, from 8 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • GMC SIERRA 2500 (2020, 2021, 2022, 2023), bulletin 11010573: This technical bulletin provides repair information to correct a customer concern of Evaporative DTCs P0442, P0446, P0455 or P0449, Caused by Dust Intrusion into the Evaporative Canister.
  • CHEVROLET SILVERADO 3500 (2020, 2021, 2022, 2023), bulletin 11010573: This technical bulletin provides repair information to correct a customer concern of Evaporative DTCs P0442, P0446, P0455 or P0449, Caused by Dust Intrusion into the Evaporative Canister.
  • GMC SIERRA 3500 (2020, 2021, 2022, 2023), bulletin 10239087: This technical bulletin provides repair information to correct a customer concern of Evaporative DTCs P0442, P0446, P0455 or P0449, Caused by Dust Intrusion into the Evaporative Canister.
  • CHEVROLET SILVERADO 1500 (2019, 2020, 2021, 2022), bulletin 10244171: This technical bulletin provides repair information to correct a customer concern of Evaporative DTCs P0442, P0446, P0455 or P0449, Caused by Dust Intrusion into the Evaporative Canister.
  • GMC SIERRA 1500 (2019, 2020, 2021, 2022), bulletin 10251357: This technical bulletin provides repair information to correct a customer concern of Evaporative DTCs P0442, P0446, P0455 or P0449, Caused by Dust Intrusion into the Evaporative Canister.
  • JEEP GLADIATOR (2020, 2019), bulletin 10174146: Customer complaint includes check engine/MIL light on. Upon further inspection, fault codes will be found in the powertrain control module (PCM) for P0441, P0443 or P0449. Fault codes may be either active or stored.

Sources: NHTSA Office of Defects Investigation complaint database and manufacturer communications file, snapshots September 2026. A complaint or bulletin that mentions a code is a report about that vehicle, not a statement that the code has one cause.