P0451
2 owner reports and 100 manufacturer filings across 55 model years from Audi, Buick, Cadillac, Chevrolet and others.
Where P0451 shows up
Source: NHTSA manufacturer communications and complaintsShowing the 25 model years where P0451 appears most; it is on file for 55 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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P0451 by make
The same record, one make at a time: the model years, bulletins and owner reports that name P0451 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.
Diagnostic scan confirms permanent active codes P2187 (System Too Lean at Idle) and P0451 (Fuel Tank Pressure Sensor Performance), indicating fuel starvation from the recalled fuel pump assembly under the rear seat
While waiting for help, I plugged in my FIXD OBD-II reader later looking over diagnostics read code P0451 – EVAP System Pressure Sensor
100 manufacturer filings name P0451. 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 P0451.
- SA-059-25 Service bulletin2025-12-17 · Electrical System
- Some vehicles may experience the CHECK ENGINE light ON with one of the following DTCs or a combination of these DTCs. P0451 • P2422 • P2451 • P0441 • This may be caused by a concern with the fuel pressure sensor or shutter valve operation.
- 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
- 9B1 OL Service campaign2024-12-10 · Electrical System
- The subject vehicles may have Diagnostic Trouble Code (DTC) P0451 stored in the ECU, which could cause the Check Engine Lamp to come on.
- 24-01-020H DBP Service campaign2024-11-14 · Fuel/Propulsion System
- Certain 2021-2023MY Sonata (DN8) and 2020-2022MY Sonata (DN8A) vehicles may have Diagnostic Trouble Code (DTC) P0451 stored in the Electronic Control Unit (ECU). The California Air Resources Board has determined that these vehicles may be releasing air pollutants which exceed Federal and California standards.
- 24-01-020H TSB Service campaign2024-11-14 · Fuel/Propulsion System
- Certain 2021-2023MY Sonata (DN8) and 2020-2022MY Sonata (DN8A) vehicles may have DTC P0451 stored in the ECU. Follow this bulletin to inspect the check valve, fuel pump cover and fuel tank, and update the ECU. If necessary, replace the check valve and/or fuel tank based on inspection results.
- TSB 24-2199 Service bulletin2024-07-02 · Fuel/Propulsion System
- Some 2024 Edge vehicles equipped with a 2.0L engine and all-wheel drive (AWD) may experience the fuel tank not filling up beyond half-full, hard to start, and/or stalls upon restart after refueling. A malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P04F0, P0451, P0455, and/or P0496 may also be stored in the powertrain control module (PCM). This may be due to a disconnected fu
What P0451 means
Source: SAE J2012 / OBD-IIP0451 sits in the generic range of the OBD-II standard, so it means the same thing on every vehicle sold in the United States — but WhichTrim does not carry a definition for it and will not invent one. What is on this page is the record: who named it and on what.
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 P0451
Source: NHTSA files and the OBD-II standardCan I keep driving with P0451 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.