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P0456 HONDA

P0456 HONDA - EVAP System Large Leak Detected

Repair Importance Level: 1/3
Repair Difficulty Level: 3/3   
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P0456 HONDA 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

First diagnose P0456 HONDA code

    Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Cost of diagnosing the P0456 HONDA code

    Labor: 1.0

    The cost of diagnosing the P0456 HONDA code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

When is the P0456 HONDA 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.

P0456 HONDA Possible Symptoms

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

P0456 Honda 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 Honda - EVAP System Large Leak Detected - AutoCodes.com

P0456 HONDA More Information

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