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
64Original wording in English
VOLKSWAGEN
Reported code forms P0456
Oil leak from Cylinder Head Cover; Customer states transmission error on dash/unable to move shifter out of park; Customer states MIL-on, P0456, P0442, or P04F0 stored in ECM memory; Customer states MIL-on; Customer…
VOLKSWAGEN
Reported code forms P0456
Oil leak from Cylinder Head Cover; Customer states transmission error on dash/unable to move shifter out of park; Customer states MIL-on, P0456, P0442, or P04F0 stored in ECM memory; Customer states MIL-on, fault P2080…
VOLKSWAGEN
Reported code forms P0456
Oil leak from Cylinder Head Cover; Customer states MIL-on, P0456, P0442, or P04F0 stored in ECM memory; Customer states MIL-on, fault P2080 present; Customer states MIL-on; Customer states various error messages on the…
VOLKSWAGEN
Reported code forms P0456
Oil leak from Cylinder Head Cover; Customer states MIL-on, P0456, P0442, or P04F0 stored in ECM memory; Customer states MIL-on, fault P2080 present; Customer states MIL-on; Customer states various error messages on the…
VOLKSWAGEN
Reported code forms P0456
Oil leak from Cylinder Head Cover; Customer states MIL-on, P0456, P0442, or P04F0 stored in ECM memory; Customer states MIL-on, fault P2080 present; Customer states MIL-on; Customer states various error messages on the…
VOLKSWAGEN
Reported code forms P0456
Oil leak from Cylinder Head Cover; Customer states MIL-on, P0456, P0442, or P04F0 stored in ECM memory; Customer states MIL-on; Customer states various error messages on the cluster; Customer states A/C Inop, no…
Check vehicle applicability
7A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Historical vehicle association; OBD-II compatibility is not established by this record.
| Make | Model | Model year |
|---|---|---|
| Volkswagen | ATLAS CROSS SPORT | 2026 |
| Volkswagen | ATLAS CROSS SPORT | 2025 |
| Volkswagen | ATLAS CROSS SPORT | 2024 |
| Volkswagen | ATLAS CROSS SPORT | 2023 |
| Volkswagen | ATLAS CROSS SPORT | 2022 |
| Volkswagen | ATLAS CROSS SPORT | 2021 |
| Volkswagen | ATLAS CROSS SPORT | 2020 |
Historical records · 1 · Historical vehicle association; OBD-II compatibility is not established by this record.
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) 13, 14 ·
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.