Fault code P1440 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P1440 – Purge Valve Stuck Open

P1440: Causes, signs and repairs

Error code P1440 is displayed and the check engine light is on - what does this mean?

The DTC P1440 is a manufacturer-specific fault code that is recognized by the OBD/EOBD diagnostics and indicates a problem in the tank ventilation system. This trouble code mainly affects the EVAP system (Evaporative Emission Control System) and occurs particularly frequently in Ford vehicles, where it indicates a fault in the tank ventilation valve control.

What can cause this error code?

Defective purge valve
Damaged vacuum lines in the EVAP system
Loose or corroded plug connections
Defective activated charcoal canister
Blocked vent lines
Faulty control unit software
Leaking fuel filler cap
Damaged fuel tank
Defective pressure sensors in the tank system

What symptoms occur in parallel with error code P1440?

Starting problems: The vehicle is difficult to start, especially after refueling
Erratic idling: The engine runs irregularly at idle speed
Fuel smell: Fuel smell around the vehicle, especially when refueling
Increased fuel consumption: Noticeably higher consumption than usual
Jerking when accelerating: Loss of power and uneven engine running
Check engine light: Continuously lit or flashing warning light

How can I fix the problem with fault code P1440?

Repairing fault code P1440 requires a systematic diagnosis of the EVAP system.
Check the tank vent valve and replace it completely if it is defective, including seals and connection lines
Check all vacuum lines of the EVAP system for cracks, blockages or loose connections and replace damaged hoses
Remove and clean the activated charcoal container or replace with a new container if heavily soiled
Check, clean and tighten electrical connections and plug connections on the tank ventilation system
Check tank cap for proper fit and intact seal, replace if necessary
Update control unit software or perform reset after repair
Carry out a complete EVAP system leak test with a professional diagnostic device

FAQ - Frequently asked questions about DTC P1440

Can I continue driving with error code P1440?

It is possible to drive with code P1440 in the short term, but you should visit a workshop as soon as possible. The defective EVAP system can lead to increased emissions and fuel consumption.

How much does it cost to repair fault code P1440?

The repair costs for error code P1440 are between 150-800 euros, depending on the defective component. A new tank ventilation valve costs around 80-200 euros plus labor.

How can I delete error code P1440 myself?

The DTC P1440 can be deleted with an OBD scanner, but will return if the cause has not been rectified. Professional diagnosis is recommended.

Is trouble code P1440 relevant for the main inspection?

Yes, the trouble code P1440 leads to a complaint during the general inspection, as it affects the exhaust gas purification system and can cause increased emissions.

What tools do I need to diagnose P1440?

To diagnose the EOBD code P1440, you need an OBD scanner, multimeter, vacuum pump and special diagnostic software for EVAP system tests.

Can a defective fuel filler cap trigger code P1440?

Yes, a leaking or defective fuel filler cap can certainly cause fault code P1440, as it is part of the closed EVAP system.

Vehicles in which error code P1440 occurs most frequently

Error code P1440 is a manufacturer-specific DTC and can indicate various EVAP system problems, but is most common in the following vehicles:

Ford: Focus, Fiesta, Mondeo, Kuga, C-Max (2005-2018)
Mazda: 3, 6, CX-5, CX-3, MX-5 (2008-2019)
Lincoln: MKZ, MKC, Navigator, Continental (2010-2020)
Mercury: Milan, Mariner, Grand Marquis (2006-2011)
Volvo: S40, V50, C30, XC60, XC90 (2007-2016)
Jaguar: XF, XE, F-Pace, XJ (2009-2018)

If the P1440 code occurs in your vehicle, you should first check the fuel filler cap and ensure that it is properly closed. Many P1440 cases can be resolved by simple maintenance work on the EVAP system. For more complex problems, however, a professional diagnosis at a specialist workshop is required, as modern EVAP systems require special diagnostic equipment and experience.

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