P0446 on GMC vehicles A fault in the evaporative vent control circuit
P0446 is named on 23 GMC model years (2019–2026): 88 manufacturer filings and 0 owner reports in NHTSA’s files, across Sierra, Sierra 2500HD, Sierra 3500HD, Canyon.
Which GMC model years name P0446
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 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 | 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 | — |
| 2026 GMC Canyon | Not specified | 1 | — |
| 2025 GMC Canyon | Not specified | 1 | — |
| 2024 GMC Canyon | Not specified | 1 | — |
| 2023 GMC Canyon | Not specified | 1 | — |
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.
GMC filings that name P0446
Source: NHTSA manufacturer communicationsBulletins and campaigns GMC filed with NHTSA whose summary names P0446. 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.
- PIT6510 Service bulletin2026-04-25 · Unknown Or Other
- This PI describes the repairs to perform if P0446 set and water and/or ice is found on the fuel pump module.
What P0446 means
Source: SAE J2012 / OBD-IIA fault in the evaporative vent control 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 P0446 a known problem on GMC vehicles?
It is a documented one: NHTSA's files hold 88 manufacturer filings and 0 owner reports naming P0446 on 23 GMC model years (2019–2026). 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 P0446 appear on most?
2023 Sierra (5 documents), 2022 Sierra (5 documents), 2021 Sierra (5 documents).
Does P0446 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.