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P0456 TOYOTA

P0456 TOYOTA - EVAP Control System Leak Detected Very Small Leak

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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
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Tech notes
There are factory service bulletin for the following Toyota models:

2003–2004 Toyota Corolla
2003–2005 Toyota Matrix
Toyota Factory Service Bulletin OBDII Code P0456 Corolla and Matrix

2003-2004 Toyota 4Runner
2003-2004 Toyota Tundra
2004 Toyota Camry
2004 Sienna
2004 Highlander
2004 Solara
Toyota Factory Service Bulletin OBDII Code P0456
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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.
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors
P0456 TOYOTA 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.
TOYOTA Technical Service Bulletins for P0456 code
2010 TOYOTA PRIUS ENGINE AND ENGINE COOLING:ENGINE Details
2010 TOYOTA PRIUS POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM) Details
2011 TOYOTA SIENNA ENGINE AND ENGINE COOLING:ENGINE Details
2011 TOYOTA SIENNA POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM) Details
2010 TOYOTA PRIUS 061000 ENGINE AND ENGINE COOLING:ENGINE Details
2010 TOYOTA PRIUS 103100 POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM) Details
2011 TOYOTA SIENNA 061000 ENGINE AND ENGINE COOLING:ENGINE Details
2011 TOYOTA SIENNA 103100 POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM) Details
2003 TOYOTA 4RUNNER ENGINE AND ENGINE COOLING:ENGINE Details
2004 TOYOTA 4RUNNER ENGINE AND ENGINE COOLING:ENGINE Details
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