P0455 A large leak in the evaporative emissions system — often a fuel cap left off
9 owner reports and 1,445 manufacturer filings across 499 model years from Acura, Buick, Cadillac, Chevrolet and others.
Where P0455 shows up
Source: NHTSA manufacturer communications and complaintsShowing the 25 model years where P0455 appears most; it is on file for 499 in total.
A model year appears here because the code is named in its record, not because every one of these vehicles sets it. Counts are mentions in the federal files, not failure rates — nobody publishes the denominator.
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P0455 by make
The same record, one make at a time: the model years, bulletins and owner reports that name P0455 on that maker’s vehicles.
What it gets filed under
What owners said
Source: NHTSA complaint databaseOwners’ own words, one per nameplate, scrubbed of anything identifying. These are unverified reports filed with NHTSA — they are what was said, not a finding that it was true.
On July 25, another diagnostic showed Check Engine FAIL with codes P0172, P0455 and P0456
The technician retrieved diagnostic codes P0455 (large EVAP leak) and P0456 (small EVAP leak), performed a smoke test, and confirmed the leak was coming specifically from the FUEL PUMP MOTOR AREA - the exact same location where the recall…
My mechanic identified code P0455, but a smoke test did not reveal a leak
Furthermore, on or around May 10, 2025, the powertrain system indicator illuminated, leading to a diagnosis on May 18th that identified code P0455, indicating an EVAP system leak
1,445 manufacturer filings name P0455. Start with what the maker wrote down.
A code names the test that failed, not the part. A bulletin that names it is often a diagnosis someone has already written down — quote its number at the service desk.
Manufacturer filings that name it
Source: NHTSA manufacturer communicationsService bulletins and campaigns whose filed summary names P0455.
- B26-025 Service bulletin2026-09-25 · Fuel/Propulsion System
- Service Bulletin - The factory fuel fill pipe assembly may not have been manufactured to specification. As a result, small contamination particles inside the fuel fill neck may prevent the primary shut-off valve flap seal from sealing properly. This may result in a fuel smell from the fuel fill neck area and may cause DTC P0455 or P0456 (EVAP system leak detected) to be set.
- B26-023 Service bulletin2026-09-25 · Fuel/Propulsion System
- Service Bulletin - The factory fuel fill pipe assembly may not have been manufactured to specification. As a result, small contamination particles inside the fuel fill neck may prevent the primary shut-off valve flap seal from sealing properly. This may result in a fuel smell from the fuel fill neck area and may cause DTC P0455 or P0456 (EVAP system leak detected) to be set.
- BEBM09252026901 Other2026-09-25 · Fuel/Propulsion System
- Dealer Message - The fuel fill pipe assembly may not have been manufactured to specification. As a result, small contamination particles inside the fuel fill neck may prevent the primary shut-off valve flap seal from sealing, resulting in fuel smell from the fuel fill neck area and may cause DTC P0455 or P0456 (EVAP system leak detected) to be set.
- TSB 25-2431 Service bulletin2025-09-13 · Power Train
- *This article supersedes TSB 24-2199 to add the rear half shaft seals to the TSB parts list. Some of the vehicles listed in the model statement above may exhibit one of the following conditions: *Fuel tank not filling up beyond half-full *Hard to start *Stalls upon restart after refueling *A malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P04F0, P0451, P0455, and/or P0496 may
- TSB 25-2308 Service bulletin2025-08-20 · Fuel/Propulsion System
- Some of the vehicles listed in the Model statement above may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P0455, P0456, P0442 and/or P04EE. This may be due to a chaffing or rubbing condition between the fuel vapor canister line and the air vent hose.
- 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 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. It is the starting point of a diagnosis, not its conclusion — the same code has several possible causes and the cheap one is not always right.
Common questions about P0455
Source: NHTSA files and the OBD-II standardCan I keep driving with P0455 stored?
Nobody can answer that from the code alone, and a site that does is guessing. A steady light means a fault was logged and the car should be checked soon; a flashing light means a severe misfire — slow down and get it seen as soon as possible, because severe misfire can quickly damage the catalytic converter. The safe read of this page is the mileage and the components, not permission.
Does a code mean the car is recalled?
No. Recalls are filed by campaign and matched by VIN, and none of them are triggered by a scan tool. If you want to know whether an open recall applies to one specific vehicle, check the VIN at nhtsa.gov/recalls — that is the only source that settles it.
Why do the counts here differ from other sites?
Because these are not estimates. Every number on this page is a count of documents in NHTSA's own files: manufacturer communications that name the code in their filed summary, and owner complaints that name it in the narrative. We do not model, weight or extrapolate them.
Will clearing the code fix it?
Clearing turns the light off and erases the freeze-frame data a technician would have used to work out what happened. If the condition is still there the code returns, usually within a few drive cycles, and the diagnosis now starts from less information than before.