The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed." property="og:description">
For Shop Owners

P0456 - EVAP Control System Leak Detected Very Small Leak

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
  • Evaporative Emission (EVAP) canister or fuel tank leaks
  • Evaporative Emission (EVAP) system hose leaking
  • Fuel tank leaking
What does this mean?

When is the code detected?

Evaporative Emission (EVAP) control system has a very large leak such as fuel filler cap fell off, 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

P0456 Description

This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition.

The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.

OBDII Code P0456 - EVAP Control System Leak Detected Very Small Leak - itimaster.ru

P0456 Information for specific makes

P0456 ACURA EVAP System Large Leak Detected
P0456 AUDI EVAP System Very Small Leak Detected
P0456 BUICK EVAP Control System Leak Detected Very Small Leak
P0456 CADILLAC EVAP Control System Leak Detected Very Small Leak
P0456 CHEVROLET EVAP Control System Leak Detected Very Small Leak
P0456 CHRYSLER EVAP System Small Leak
P0456 DODGE EVAP System Small Leak
P0456 FORD EVAP System Leak Detected Gross Leak/No Flow
P0456 GMC EVAP Control System Leak Detected Very Small Leak
P0456 HONDA EVAP System Large Leak Detected
P0456 HYUNDAI EVAP Emission System Leak Detected Very Small Leak
P0456 INFINITI EVAP Control System Very Small Leak Detected
P0456 JEEP EVAP System Small Leak
P0456 KIA EVAP Emission System Leak Detected Very Small Leak
P0456 MAZDA EVAP Emission System Leak Detected Very Small Leak
P0456 MITSUBISHI EVAP System Very Small Leak Detected
P0456 NISSAN Evaporative Emission Control System Very Small Leak Detected
P0456 PONTIAC EVAP Control System Leak Detected Very Small Leak
P0456 SATURN EVAP Control System Leak Detected Very Small Leak
P0456 SCION EVAP Control System Leak Detected Very Small Leak
P0456 SUBARU EVAP System Leak Detected Very Small Leak
P0456 SUZUKI EVAP Control System Leak Detected Very Small Leak
P0456 TOYOTA EVAP Control System Leak Detected Very Small Leak
P0456 VOLKSWAGEN EVAP System Very Small Leak Detected

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P0456 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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