P0449 on GMC vehicles A fault in the evaporative vent valve or solenoid circuit
P0449 is named on 19 GMC model years (2019–2025): 84 manufacturer filings and 1 owner report in NHTSA’s files, across Sierra, Sierra 2500HD, Sierra 3500HD.
Which GMC model years name P0449
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2022 GMC Sierra | Engine | 5 | 1 |
| 2024 GMC Sierra 2500HD | Engine | 5 | — |
| 2024 GMC Sierra 3500HD | Engine | 5 | — |
| 2023 GMC Sierra | Engine | 5 | — |
| 2023 GMC Sierra 2500HD | Engine | 5 | — |
| 2023 GMC Sierra 3500HD | Engine | 5 | — |
| 2022 GMC Sierra 2500HD | Engine | 5 | — |
| 2022 GMC Sierra 3500HD | Engine | 5 | — |
| 2021 GMC Sierra | Engine | 5 | — |
| 2021 GMC Sierra 2500HD | Engine | 5 | — |
| 2021 GMC Sierra 3500HD | Engine | 5 | — |
| 2020 GMC Sierra | Engine | 5 | — |
| 2020 GMC Sierra 2500HD | Engine | 5 | — |
| 2020 GMC Sierra 3500HD | Engine | 5 | — |
| 2019 GMC Sierra | Engine | 5 | — |
| 2024 GMC Sierra | Engine | 3 | — |
| 2025 GMC Sierra | Engine | 2 | — |
| 2025 GMC Sierra 2500HD | Engine | 2 | — |
| 2025 GMC Sierra 3500HD | Engine | 2 | — |
A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.
What GMC owners said
Source: NHTSA complaint databaseOwners’ own words, scrubbed of anything identifying. Unverified reports filed with NHTSA — what was said, not a finding that it was true.
The vehicle was taken to an independent mechanic to be diagnosed, and DTC: P0449 and P0498 were retrieved
GMC filings that name P0449
Source: NHTSA manufacturer communicationsBulletins and campaigns GMC filed with NHTSA whose summary names P0449. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- 23-NA-073 Service bulletin2023-06-19 · Engine And Engine Cooling
- 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.
- 23-NA-073 Service bulletin2023-09-20 · Engine And Engine Cooling
- 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.
- 23-NA-073 Service bulletin2024-02-26 · Engine And Engine Cooling
- 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.
- 23-NA-073 Service bulletin2024-10-07 · Engine
- 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.
- 23-NA-073 Service bulletin2025-03-13 · Engine
- 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.
What P0449 means
Source: SAE J2012 / OBD-IIA fault in the evaporative vent valve or solenoid circuit.
A stored code names the test that failed, never the part that caused it. The record above is what GMC and its owners have filed about it; the code’s page across every make has the whole file.
Common questions
Source: NHTSA files and the OBD-II standardIs P0449 a known problem on GMC vehicles?
It is a documented one: NHTSA's files hold 84 manufacturer filings and 1 owner report naming P0449 on 19 GMC model years (2019–2025). Whether it is a problem on one particular car is a diagnosis, not a count — but a bulletin that names the code on your model year is the place to start.
Which GMC models does P0449 appear on most?
2022 Sierra (6 documents), 2023 Sierra (5 documents), 2021 Sierra (5 documents).
Does P0449 on a GMC mean it is recalled?
No. Recalls are filed by campaign and matched by VIN; no recall is triggered by a scan tool. Check the VIN at nhtsa.gov/recalls, or open the model year's page here for the campaigns filed against it.