P0455 on Buick vehicles A large leak in the evaporative emissions system — often a fuel cap left off
P0455 is named on 39 Buick model years (2016–2023): 117 manufacturer filings and 0 owner reports in NHTSA’s files, across Encore, Enclave, Regal, Cascada, Envision and 2 more.
Which Buick model years name P0455
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.
Buick filings that name P0455
Source: NHTSA manufacturer communicationsBulletins and campaigns Buick filed with NHTSA whose summary names P0455. 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.
- 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
- 17NA383 Service bulletin2017-11-29 · Engine And Engine Cooling — Exhaust System — Emission Control
- This technical bulletin provides a procedure to replace the evap canister for vehicles with the condition of Malfunction Indicator Lamp (MIL) Illuminated with DTC P0446 or P0455 Set due to spiders laying a nest within the canister.
What P0455 means
Source: SAE J2012 / OBD-IIA large leak in the evaporative emissions system — often a fuel cap left off.
A stored code names the test that failed, never the part that caused it. The record above is what Buick 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 P0455 a known problem on Buick vehicles?
It is a documented one: NHTSA's files hold 117 manufacturer filings and 0 owner reports naming P0455 on 39 Buick model years (2016–2023). 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 Buick models does P0455 appear on most?
2021 Encore (6 documents), 2020 Encore (6 documents), 2019 Enclave (4 documents).
Does P0455 on a Buick 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.