P0455 on Ford vehicles A large leak in the evaporative emissions system — often a fuel cap left off

A 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.

Bulletins and campaigns Ford 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.

• SSM 50306 Service bulletin
  2021-11-23 · Engine And Engine Cooling
• Some 2018-2021 EcoSport, Expedition, Navigator; 2019-2021 Ranger; 2020-2021 Escape, Corsair, Explorer, Transit; 2021 Bronco, Bronco Sport, Edge, Nautilus, F-150, Mustang; 2019-2022 Transit Connect; 2020-2022 Aviator, F-Super Duty; and 2022 Maverick vehicles may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTC) P0496, P0456, P0455, P04F0, and/or P0451. Ford
• SSM 50348 Service bulletin
  2021-12-14 · Electrical System
• Some 2020-2022 Explorer/Aviator vehicles may exhibit an illuminated MIL with multiple diagnostic trouble codes (DTC). These DTCs may include P04F0, P008A, P0451, P0455, P0456, P0496 and/or P018C. This may be due to the wiring harness connection at connector C1198. Prior to replacement of any components, inspect the connector and wiring harness for any damage or pin fit concerns. If any damage or p
• SSM 51132 Service bulletin
  2022-10-14 · Electrical System
• Some 2020-2022 Explorer vehicles equipped with a 2.3L engine may exhibit an illuminated malfunction indicator lamp (MIL) with multiple diagnostic trouble codes (DTCs). These DTCs may include P04F0, P008A, P0451, P0455, P0456, P0496 and/or P018C. This may be due to the wiring harness connection at connector C1198. Prior to replacement of any components, inspect the connector and wiring harness for
• SSM 49313 Service bulletin
  2020-11-06 · Equipment
• Some 2020 Escape/Corsair vehicles may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P0442, P0455, P0456, and/or P0457. This may be due to damage to the carbon canister which may have occurred during vehicle transportation. This condition may not occur for a few hundred miles/km or equivalent key cycles. Inspect the left side underbody air deflector fo
• TSB 21-2020 Service bulletin
  2021-01-27 · Fuel System, Diesel — Storage — Tank Assembly
• Some 2020 Escape 2.0L EcoBoost, front wheel drive (FWD) vehicles built on or before 20-Mar-2020 may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P00FE, P0456, P0455 and a fuel gauge that never indicates full after a refueling event (only reads approximately 90%). This may be due to the calibration in the powertrain control module (PCM) being configured
• SSM 51719 Service bulletin
  2023-06-15 · Engine And Engine Cooling
• Some 2021-2023 F-Super Duty/E-Series vehicles equipped with a 6.2L, 6.8L or 7.3L gasoline engine may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P0457 and/or P0455 stored in the powertrain control module (PCM). This may be due to a improper fuel filler cap installation and/or outside contamination on the fuel cap sealing surface. The fuel filler cap r
• TSB 24-2199 Service bulletin
  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
• TSB 25-2431 Service bulletin
  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
• TSB 25-2308 Service bulletin
  2025-08-20 · 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.

A stored code names the test that failed, never the part that caused it. The record above is what Ford and its owners have filed about it; the code’s page across every make has the whole file.