P0456 Ford Code - EVAP System Leak Detected Gross Leak/No Flow
Quick Answer
This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using an engine intake manifold vacuum. Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
- What it means
- P0456 Ford indicates EVAP System Leak Detected Gross Leak/No Flow.
- Common causes
- Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close.
- Severity
- Low - monitor the vehicle and repair when practical.
- Can I drive?
- The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
Code P0456 Ford Description
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.
The Diagnostic Trouble Code (DTC) will set when the EVAP control system has a very large leak such as the fuel filler cap fell off, the EVAP control system does not operate properly.
What are the Possible Causes of the DTC P0456 Ford?
- 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
How to Fix the DTC P0456 Ford?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
1997-2000 Ford Contour
1997-2002 Ford Escort
1997-2003 Ford Crown Victoria
1997-2003 Ford Mustang
1997-2003 Ford Taurus
1998-2003 Ford Escort ZX2
2000-2003 Ford Focus
2002-2003 Ford Thunderbird
1997 Ford F-250 HD
1997-1999 Ford F-250 LD
1997-2003 Ford E Series
1997-2003 Ford Expedition
1997-2003 Ford Explorer
1997-2003 Ford F-150
1997-2003 Ford Ranger
1997-2003 Ford Windstar
1999-2003 Ford F Super Duty
2000-2003 Ford Excursion
2001-2003 Ford Escape
2001-2003 Ford Explorer Sport Trac
2001-2003 Ford Explorer Sport
Ford Factory Service Bulletin OBDII Code P0456
User Submitted Video
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0456 Ford code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Ford Models
- P0456 1997 Ford F150 — EVAP Control System Leak Detected Very Small Leak
- P0456 1998 Ford F150 — EVAP Control System Leak Detected Very Small Leak
- P0456 1999 Ford F150 — EVAP Control System Leak Detected Very Small Leak
- P0456 2000 Ford F150 — EVAP Control System Leak Detected Very Small Leak
- P0456 2001 Ford F150 — EVAP Control System Leak Detected Very Small Leak
- P0456 2002 Ford F150 — EVAP Control System Leak Detected Very Small Leak
- P0456 2003 Ford F150 — EVAP Control System Leak Detected Very Small Leak
- P0456 2006 Ford Fusion — EVAP System Leak Detected Gross Leak/No Flow
- P0456 2007 Ford Fusion — EVAP System Leak Detected Gross Leak/No Flow
- P0456 2008 Ford Fusion — EVAP System Leak Detected Gross Leak/No Flow
- P0456 2009 Ford Fusion — EVAP System Leak Detected Gross Leak/No Flow
- P0456 2010 Ford Fusion — EVAP System Leak Detected Gross Leak/No Flow
- P0456 2011 Ford Fusion — EVAP System Leak Detected Gross Leak/No Flow
- P0456 2012 Ford Fusion — EVAP System Leak Detected Gross Leak/No Flow
Frequently Asked Questions about P0456 Ford Code
1. What are common symptoms of OBDII code P0456 on a Ford vehicle?
The most common symptoms of P0456 include the illumination of the Check Engine Light (CEL) and a noticeable fuel odor around the vehicle.
2. What are the possible causes of OBDII code P0456 in a Ford car?
Some possible causes of P0456 include a loose or damaged gas cap, a cracked or damaged fuel filler neck, a faulty EVAP system purge valve, or a leak in the EVAP system hoses.
3. How serious is OBDII code P0456 on a Ford vehicle?
While P0456 is not a critical issue that will affect the immediate drivability of the vehicle, it should be addressed in a timely manner to prevent potential fuel economy and emissions problems.
4. How can I diagnose OBDII code P0456 in my Ford car?
Diagnosing P0456 typically involves conducting a visual inspection of the EVAP system components, checking the gas cap for proper sealing, and using a scan tool to monitor EVAP system pressure and sensor data.
5. Can I drive my Ford vehicle with OBDII code P0456?
It is generally safe to drive your vehicle with a P0456 code, but it is recommended to have the issue diagnosed and repaired as soon as possible to avoid potential fuel system problems.
6. What are some repair tips for fixing OBDII code P0456 on a Ford?
Repairing P0456 may involve simply tightening or replacing the gas cap, inspecting and repairing any damaged EVAP system components, or testing and replacing faulty purge valves or pressure sensors.
7. How much does it cost to fix OBDII code P0456 on a Ford car?
The cost of repairing P0456 can vary depending on the root cause of the issue, the labor rates in your area, and whether you choose to do the repairs yourself or take your vehicle to a professional mechanic.
8. Can a DIY enthusiast fix OBDII code P0456 in a Ford vehicle?
Yes, many DIY enthusiasts can successfully diagnose and repair P0456 by following online guides, using basic tools, and having access to a scan tool to clear the code after the repair is completed.
9. How long does it take to fix OBDII code P0456 in a Ford car?
The time required to fix P0456 can vary depending on the specific cause of the issue, but in most cases, the repair can be completed within a few hours to a day, including diagnosis and replacement of components if necessary.
10. Will OBDII code P0456 reset itself after repair on a Ford vehicle?
After repairing the issue causing P0456, you may need to use an OBDII scan tool to clear the code and reset the Check Engine Light. In some cases, the code may reset automatically after a certain number of successful drive cycles without the issue reoccurring.
Discuss the causes and fixes for P0456 Ford OBDII Code
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Awesome write-up and video. Practical tips like what was given in the video (testing for suction with your finger and the valve unplugged) are exactly what us DIYr's need...we don't have all the fancy tools of a shop. Also the explanation of why that is a valid test and a summary of the EVAP system is very valuable for understanding what you're really doing and why.
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