P0456 A very small leak in the evaporative emissions system
49 owner reports and 2,475 manufacturer filings across 380 model years from Acura, BMW, Chrysler, Dodge and others.
Where P0456 shows up
Source: NHTSA manufacturer communications and complaintsShowing the 25 model years where P0456 appears most; it is on file for 380 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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P0456 by make
The same record, one make at a time: the model years, bulletins and owner reports that name P0456 on that maker’s vehicles.
What it gets filed under
When owners report it
miles, typically
Half of the 14 owner reports naming P0456 that carry an odometer reading fall between 49,000 and 83,000 miles. A code that shows up at 30,000 miles is a different proposition from one that shows up at 130,000, and that difference is the single most useful thing in this record.
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.
An August 2026 repair involved diagnostic code P0456 and replacement of the EVAP canister and N80 valve
An independent OBD-II scan documented code P0456 simultaneously as stored, pending and permanent, as well as P0170 as a permanent diagnostic code
On May 27, only five days and approximately 96 miles after purchase, a diagnostic showed Check Engine FAIL with codes P0128 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…
At approximately 39,000 miles (on 02-Jan-2026), the unresolved fuel issue caused a failure of the Catalytic Converter (Code P0420) and an Evaporative Emission System leak (Code P0456)
2,475 manufacturer filings name P0456. 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 P0456.
- 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.
- NTB26-006A Service bulletin2026-05-01 · Fuel/Propulsion System
- FUEL FILLER TUBE LOWER SEAL IS LEAKING AND DTC P0456 IS STORED IN THE ECM This bulletin is no longer active. Please discard previous versions of NTB26-006.
- ITB26-002A Service bulletin2026-05-01 · Fuel/Propulsion System
- FUEL FILLER TUBE LOWER SEAL IS LEAKING AND DTC P0456 IS STORED IN THE ECM This bulletin is no longer active. Please discard previous versions of ITB26-002.
- NTB26-006 Service bulletin2026-02-02 · Fuel/Propulsion System
- FUEL FILLER TUBE LOWER SEAL IS LEAKING AND DTC P0456 IS STORED IN THE ECM IF YOU CONFIRM The vehicle has a visible leak with a smoke machine test coming from the fuel filler tube lower seal, AND DTC P0456 is stored as “Active”, “Past”, or “Pending” in the ECM. ACTION 1. Remove the supplied funnel from the rear of the vehicle or trunk. 2. Insert the funnel completely in the fuel filler tube and rem
What P0456 means
Source: SAE J2012 / OBD-IIA very small leak in the evaporative emissions system.
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 P0456
Source: NHTSA files and the OBD-II standardCan I keep driving with P0456 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.