TuningBot DTC Database · v4.37.15

P0440 Evaporative Emission Control System Malfunction

Generic (OBD-II) interpretation in the TuningBot DTC database.

P · PowertrainEmissionsOBD2

What P0440 means

P0440

Evaporative Emission Control System Malfunction Generic · emissions Data confidence 90%

The control module detected improper operation of the Evaporative Emission Control System.

Symptoms

MIL illuminated
Possible fuel smell in case of larger leaks

Possible causes

Hose connection(s)
intake leak
EVAP canister purge valve

Recommended checks

Check fuel filler cap seating first
Read fuel tank pressure sensor values
Actuate purge and vent valves and verify response
Smoke-test the EVAP system for leaks

Related and nearby codes

P04 range

P0400 P0401 P0402 P0403 P0404 P0405 P0406 P0407 P0408 P0409 P040A P040B P040C P040D P040E P040F P0410 P0411

How to read P0440

Powertrain: engine, transmission and driveline systems.

Generic SAE-standard code: same meaning on every make.

440

Specific fault index within the subsystem.

Frequently asked questions about P0440

What does P0440 mean?

Evaporative Emission Control System Malfunction. The control module detected improper operation of the Evaporative Emission Control System.

Is P0440 generic or manufacturer-specific?

P0440 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P0440 at file level?

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.

Other file services

Stage 1/2/3 Tuning DPF Removal EGR Removal AdBlue / SCR Removal DTC Removal IMMO OFF Speed Limiter (Vmax)

Understand the system behind this code: EVAP System

ECU tuningDyno-tested results by model and engine See the results →

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