- Large and small leaks

- Excess vacuum

- Purge flow during non-commanded conditions

- Fuel Level and Fuel Pressure sensor faults

- EVAP Purge and Vent Valve faults

The ECM monitors the Fuel Tank Pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. The ECM commands both the EVAP Purge Solenoid and the EVAP Vent Valve ON when the conditions are met in order to apply an engine vacuum to the EVAP system. The ECM commands the EVAP Purge Solenoid OFF once the system has reached a predetermined level of vacuum. This test verifies if a vacuum can be achieved in the EVAP system. Failure to develop a vacuum may be caused by a large leak or a restriction. " property="og:description">

For Shop Owners

P0440 - Evaporative Emission Control System Malfunction

Repair Importance Level: 1/3
Repair Difficulty Level: 3/3 What does this mean?

Possible causes

  • Missing or loose fuel cap
  • Incorrect fuel filler cap used
  • Fuel filler cap remains open or fails to close
  • Foreign matter caught in fuel filler cap
  • EVAP canister or fuel tank leaks
  • EVAP system hose leaking
  • Fuel tank leaking
What does this mean?

Tech notes

The P0440 code means that the control module has detected a leak in the Evaporative Emission (EVAP). Loose fuel tank filler cap is the most common cause that triggers the P0440 code.
What does this mean?

When is the code detected?

Malfunction is detected when EVAP control system has a leak, EVAP control system does not operate properly.

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible a noticeable fuel odor caused by the release of fuel vapors

P0440 Description

The Engine Control Module (ECM) tests the Evaporative Emission (EVAP) system for the following conditions:

- Large and small leaks

- Excess vacuum

- Purge flow during non-commanded conditions

- Fuel Level and Fuel Pressure sensor faults

- EVAP Purge and Vent Valve faults

The ECM monitors the Fuel Tank Pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. The ECM commands both the EVAP Purge Solenoid and the EVAP Vent Valve ON when the conditions are met in order to apply an engine vacuum to the EVAP system. The ECM commands the EVAP Purge Solenoid OFF once the system has reached a predetermined level of vacuum. This test verifies if a vacuum can be achieved in the EVAP system. Failure to develop a vacuum may be caused by a large leak or a restriction.

OBDII Code P0440 - Evaporative Emission Control System Malfunction - itimaster.ru

P0440 Information for specific makes

P0440 AUDI EVAP Canister Purge Regulator Valve
P0440 BMW Tank Venting System Function
P0440 BUICK Evaporative Emission System
P0440 CADILLAC Evaporative Emission System
P0440 CHEVROLET Evaporative Emission System
P0440 CHRYSLER General EVAP System Failure
P0440 DODGE General EVAP System Failure
P0440 GMC Evaporative Emission System
P0440 INFINITI EVAP Control System Small Leak
P0440 JEEP General EVAP System Failure
P0440 LEXUS Evaporative Emission Control System Malfunction
P0440 MAZDA Evaporative Emission System
P0440 MERCEDES-BENZ Evaporative Emission Control System Malfunction
P0440 MINI Tank Venting System Function
P0440 MITSUBISHI EVAP Control System Malfunction
P0440 NISSAN EVAP Control System Small Leak
P0440 PONTIAC Evaporative Emission System
P0440 SATURN Evaporative Emission System
P0440 SCION Evaporative Emission Control System Malfunction
P0440 TOYOTA Evaporative Emission Control System Malfunction
P0440 VOLKSWAGEN EVAP Canister Purge Regulator Valve

Need more help?

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P0440 Comments

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Any information is appreciated. Thanks
Repair Importance Level: 1
1=Low 2=Medium 3=High
Repair Difficulty Level: 3
1=Easy 2=Moderate 3=Hard

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