P0442 on GMC vehicles A small leak in the evaporative emissions system
P0442 is named on 63 GMC model years (2016–2025): 261 manufacturer filings and 1 owner report in NHTSA’s files, across Sierra, Yukon, Sierra 2500HD, Savana, Sierra 3500HD and 3 more.
Which GMC model years name P0442
Source: NHTSA manufacturer communications and complaintsA 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.
Car has less that 1000 miles and the check engine light has been on 3 times with a P0442
GMC filings that name P0442
Source: NHTSA manufacturer communicationsBulletins and campaigns GMC filed with NHTSA whose summary names P0442. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- 21NA124 Service bulletin2021-05-25 · Electrical System
- This service bulletin provides diagnostic tips/steps on testing for possible EVAP leaks in the system to correct a customer concern of an MIL Illuminated with DTCs P0442 and/or P0455 Set.
- 21NA124 Service bulletin2021-05-25 · Fuel System, Gasoline — Storage — Evaporative Emissions — Canister
- This service bulletin provides diagnostic tips/steps on testing for possible EVAP leaks in the system to correct a customer concern of an MIL Illuminated with DTCs P0442 and/or P0455 Set.
- 21-NA-124 Service bulletin2022-12-14 · Engine And Engine Cooling
- This service bulletin provides diagnostic tips/steps on testing for possible EVAP leaks in the system to correct a customer concern of an MIL Illuminated with DTCs P0442 and/or P0455 Set.
- PIT4943D Service bulletin2015-12-09 · Fuel System, Other — Storage — Tank Assembly
- This Preliminary Information communication provides information to the technician about vehicles that have a Service Engine Soon Malfunction Indicator Lamp. Technician may find Diagnostic Trouble Code P0442. Technician will need to review Techlink article from May 2013 titled "Using the Evaporative Emissions System Tester" Technician will need to follow these steps to help diagnose the issue. Firs
- 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.
- PIE0528 Service bulletin2019-07-11 · Engine And Engine Cooling
- Some customers may note a Check Engine Light related to the evaporative emission canister performance. Technicians may find the following DTCs set: P0442 P0455 P0446 P0449 P0498 This engineering informational bulletin is requesting information from the field on warranty parts for complete canister assemblies that apply to the DTC codes specified and has leak conditions. Engineer
- 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 P0442 means
Source: SAE J2012 / OBD-IIA small leak in the evaporative emissions system.
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 P0442 a known problem on GMC vehicles?
It is a documented one: NHTSA's files hold 261 manufacturer filings and 1 owner report naming P0442 on 63 GMC model years (2016–2025). 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 P0442 appear on most?
2019 Sierra (11 documents), 2020 Sierra (9 documents), 2016 Yukon (9 documents).
Does P0442 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.