P0451

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.

Owners’ 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.

Service bulletins and campaigns whose filed summary names P0451. Quoting the document number at a service desk is often the fastest route to a diagnosis someone has already written down.

• SA-059-25
  2025-12-17 · Fuel/Propulsion 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
  2025-09-13 · 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 campaign
  2024-12-10 · 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 campaign
  2024-11-14 · 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 campaign
  2024-11-14 · 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
  2024-07-02 · 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

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.