What does this code mean?
The EVAP monitor detects purge behavior that does not match its expected response. This is not automatically a leak-size code or proof of a loose fuel cap. Monitor strategy varies by vehicle; an extended code and manufacturer procedure may describe the failure more precisely.
Sources and interpretation [1]
A code identifies a detected condition, not a part that must automatically be replaced.
Before replacing a part
Record the full code and recent software work. Use the specified EVAP test equipment and pressure limits. In the Atlas example, the diagnostic sequence separates canister debris, purge-valve vacuum testing and leak-detection wiring; do not skip directly to a fuel-cap replacement.
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P044100EVAP Emission Contr.Sys.Incorrect Purge Flow - logged within one or both engine control modulesManufacturer communications
1Original wording in English
BENTLEY
Reported code forms P044100
Emission control system lamp illuminated - DTC P044100 evident Customer Statement: -Emission control system warning lamp illuminated (Figure 1) within the Driver Information Panel (DIP) in conjunction with DTC -…
Check vehicle applicability
4A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Bentley | CONTINENTAL GT SPEED | 2024 |
| Bentley | CONTINENTAL GT SPEED | 2023 |
| Bentley | CONTINENTAL GT SPEED | 2022 |
| Bentley | CONTINENTAL GT SPEED | 2021 |
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.
- Audi TT Quick Reference Specification Book · October 2013 ↗
Audi of America · PDF page(s) 140 ·
- 01-19-09TT / 2057754/2 · EVAP faults after software update ↗
Volkswagen Group of America · PDF page(s) 1, 2 ·
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.