What does this code mean?
P0442 describes a small leak, P0455 a large leak and P0456 a very small leak. Check the correct fuel-cap seal where fitted, hoses, valves and the manufacturer's leak-test procedure. A loose cap is one possibility, not the only cause. Do not use compressed air or improvised flame tests around fuel vapour.
Sources and interpretation [1]
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer communications
10Original wording in English
FORD, LINCOLN
Reported code forms P0455
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,…
FORD
Reported code forms P0455
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…
FORD, LINCOLN
Reported code forms P0455
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…
FORD, LINCOLN
Reported code forms P0455
Some 2017 Escape and MKC vehicles equipped with a 1.5L, 2.0L or 2.3L engine may exhibit an illuminated MIL with diagnostic trouble codes (DTCs) P0455, P0456, P144C and/or P1450 stored in the powertrain control module…
FORD
Reported code forms P0455
Some 2017 Escape vehicles equipped with a 1.5L Gasoline Turbocharged Direct Injection (GTDI) engine built on or before 9-Jun-2016 may exhibit an illuminated MIL with diagnostic trouble code (DTC) P0455 and/or P144C…
FORD
Reported code forms P0455
A CHECK FUEL CAP INDICATOR ILLUMINATED WITH DIAGNOSTIC TROUBLE CODE (DTC) P0457 OR A MALFUNCTION INDICATOR LAMP ILLUMINATED WITH DTC P0455 OR P0457. *TT
Check vehicle applicability
6A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Sources and interpretation
These explanations are editorial summaries of the linked manufacturer material. PDF page numbers count from the first file page. Original publications are in English; translations are reference aids. A cited edition is not a claim that it is the manufacturer's latest instruction.
- 2024–2025 MY OBD System Operation Summary for Gasoline Engines ↗
Ford Motor Company · PDF page(s) 11, 12 ·
Source check date · 2026-10-27
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.