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.
P045600EVAP system leak detected NVLD (very small leak)) - Repair AuthorizationManufacturer communications
10Original wording in English
AUDI
Reported code forms P045600
This bulletin contains repair instructions for when the MIL is on and the DTC P045600 is stored in the ECM. This document also applies to the 2015 A3 Cabriolet and the 2015 A4 Cabriolet.
AUDI
Reported code forms P045600
This bulletin contains repair instructions for when the MIL is on and the DTC P045600 is stored in the ECM. Vehicles also include 2015 A3 Cabriolet and 2012 RS7,
AUDI
Reported code forms P045600
MIL on (DTC P045600 - EVAP system leak detected NVLD (very small leak)) - Repair Authorization. DTC P045600 (EVAP System Leak Detected NVLD (very small leak)) is stored in the engine control module (ECM), J623 (address…
AUDI
Reported code forms P045600
Supersedes Technical Service Bulletin Group 20 number 15-53 dated October 29, 2015. The MIL is on. DTC P045600 (EVAP System Leak Detected NVLD (very small leak)) is stored in the engine control module (ECM), J623…
AUDI
Reported code forms P045600
Supersedes Technical Service Bulletin Group 20 number 15-52 dated October 28, 2015. The MIL is on. DTC P045600 (EVAP System Leak Detected NVLD (very small leak)) is stored in the engine control module (ECM), J623…
AUDI
Reported code forms P045600
Supersedes Technical Service Bulletin Group 20 number 15-51 dated October 28, 2015. The MIL is on. DTC P045600 (EVAP System Leak Detected NVLD (very small leak)) is stored in the engine control module (ECM), J623…
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 | A7 | 2016 |
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.