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 wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P0456very small EVAP leakP045600very small EVAP leakManufacturer communications
4Original wording in English
AUDI
Reported code forms P045600
01 MIL on, no leak in EVAP system (DTC P045600 in ECM. Software update needed.
AUDI
Reported code forms P045600
Supersedes Technical Service Bulletin Group 01 number 13-99 dated May 17, 2013. MIL on. DTC P045600 (very small EVAP leak) stored in engine control module (ECM), J623 (address word 01). No leaks found in the EVAP…
AUDI
Reported code forms P045600
Supersedes Technical Service Bulletin Group 01 number 13-85 dated April 11, 2013. MIL on. DTC P045600 (very small EVAP leak) stored in engine control module (ECM), J623 (address word 01). No leaks found in the EVAP…
AUDI
Reported code forms P0456
Supersedes Technical Service Bulletin Group 01 number 13-84 dated April 3, 2013. MIL on. DTC P0456 (very small EVAP leak) stored in engine control module (ECM), J623 (01). No leaks found in the EVAP system.
Check vehicle applicability
1A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Audi | A8 | 2010 |
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.