1. Year
2. Make
3. Model
4. Trim
5. Fuel Type

Great news! FIXD is compatible with your vehicle.


Unfortunately, FIXD is not guaranteed to be compatible with your vehicle.

Fix your car yourself with FIXD!

FIXD logo

Toyota Tundra P0456 – Meaning, Causes, Symptoms, & Fixes


{{vehicleYear}} {{vehicleMake.name}} {{vehicleModel.name}} - {{dtc}}


Enter your information to get the most likely fix for your P0 code and how much it will cost.

Vehicle Info

We don't have data for this code for your car.

Fix: {{costEstimate.fix}}

Cost Range: {{formatMoney(costEstimate.lowEstimate)}} - {{formatMoney(costEstimate.highEstimate)}}

Diagnose and fix your engine check engine light yourself with FIXD! Click below to save 67%!


Diagnose and fix your check engine light yourself

See what your engine code means in plain English
Get the most likely repair and cost
Access our Mechanic Hotline
Do repairs yourself and save $1000s

What Does Toyota Tundra Code P0456 Mean?

  • Toyota Tundra P0456 definition: Evaporative emission control system leak (small).
  • Issue Severity: LOW – Continued driving for a short period of time is okay
  • Repair Urgency: Get this fixed within the next month to prevent drivability problems and excessive fuel consumption.
  • Diagnosis: It is unlikely the driver will notice any symptoms with check engine light code P0456 other than a slight odor of fuel, a slight decrease in fuel economy, and the check engine light. However, as with all check engine lights, it is recommended that you get it fixed as soon as possible so the engine can be running at the proper specifications to prevent further damage. Use the FIXD Sensor and app to see the most likely fix and cost for P0456, get detailed diagnostics in plain English, access our Mechanic Hotline, and more.

The EVAPorative emission control (EVAP) system prevents fuel vapors from escaping into the atmosphere. The fuel vapors from the fuel tank are absorbed and stored by charcoal pellets in the charcoal canister. The vent control valve is controlled by the engine control module (ECM) and allows air to flow into the charcoal canister to purge the gas vapors into the engine air intake to be burned. The flow of the gas vapors from the charcoal canister to the engine air intake is controlled by a purge volume control valve. The vent control valve is usually open when the engine is at normal operating temperature, and the purge volume control valve is commanded on when the ECM is ready to burn the built-up fuel vapors. However, when the Toyota Tundra is turned off the ECM performs a leak test to ensure the EVAPorative emission control system is working properly. During the leak test, the ECM closes the vent control valve and purge valve to seal the EVAPorative system. If the EVAP system does not maintain the pressure, the ECM recognizes an EVAPorative emission control leak. In the case of P0456, it is a small leak, less than .020” in diameter.

Most Likely Repair And Cost For Toyota Tundra P0456 By Year

The chart below shows the most likely repair and cost range for Tundras for all of the years that FIXD has data on.

Year Most Likely Repair Cost Range
2013 Fuel Filler Cap $58 – $165
2012 Fuel Filler Cap $58 – $165
2009 Fuel Filler Cap $58 – $165
2008 Fuel Filler Cap $58 – $165
2007 Fuel Filler Cap $58 – $165
2006 Fuel Filler Cap $58 – $165
2005 Fuel Filler Cap $58 – $165
2004 Charcoal Canister $753 – $1000
2003 Charcoal Canister $753 – $1000
2002 Charcoal Canister $753 – $1000
2001 Charcoal Canister $753 – $1000
2000 Evaporative Emissions (EVAP) Canister Vent Solenoid/Valve $50 – $150

Toyota Tundra P0456 Causes

There are many potential causes of code P0456.

  • Loose or damaged gas cap
  • Leaking or disconnected EVAP hose
  • Faulty purge volume control valve
  • Faulty canister vent control valve
  • Charcoal canister leak
  • Leaking fuel tank
  • P0456 is not one of the top 5 trouble codes for the Toyota Tundra but, it is still a common one.

Toyota Tundra P0456 Symptoms

How Do I Fix Toyota Tundra Code P0456?

With an EVAP fault, the first step is to get it diagnosed to figure out what is causing the problem.

The FIXD Sensor and app can help you diagnose and fix P0456 yourself by giving you access to detailed engine diagnostics that are easy to understand (even if you don’t know cars), live OBD2 data, and a Mechanic Hotline. You can even use FIXD to clear the fault codes on your Tundra and see if your fix worked, or simply turn off codes that aren’t serious.

> Click here to get FIXD for $19.99 for a limited time!

If your Toyota Tundra has this fault and you’re not comfortable diagnosing this issue at home, we recommend finding a RepairPal certified shop nearby to pinpoint the problem and give an accurate estimate for repairs.

These shops can not only help you figure out what’s going wrong before you waste time and money on the wrong parts, but they also offer a minimum 12-month, 12,000-mile warranty and stand behind all their estimates with guaranteed fair pricing.

How Much Does It Cost to Fix Toyota Tundra Code P0456?

P0456 can be caused by anything from a loose gas cap to a faulty valve to a leaking fuel tank. It’s impossible to give an accurate estimate without properly diagnosing the issue first.

If you take your car to a shop for diagnosis, most shops will start with an hour of “diag time” (the time spent in labor diagnosing your specific issue). Depending on the shop’s labor rate, this typically costs somewhere between $75-$150. Many, if not most, shops will apply this diagnosis fee to any required repairs if you have them perform the repairs for you. From there, a shop will be able to give you an accurate estimate for repairs to fix your P0456 code.

Possible Repair Costs for Toyota Tundra P0456

For error code P0456, one or more of the below repairs may be needed to solve the underlying issue. For each possible repair, the estimated cost of repair includes the cost of the relevant parts and the cost of labor required to make the repair.

  • Gas Cap $20-$60
  • Evap Purge Volume Control Valve $150-$200
  • Charcoal Canister Vent Control Valve $150-$200
  • Replacement Evap Line $50-$100
  • Charcoal Canister $200-$600

DIY Steps to Diagnose Toyota Tundra Code P0456

Toyota Tundra engine code P0456 could be caused by a number of things, including a loose gas cap, a faulty valve, or a leaking fuel tank. If you’d like to try to fix code P0456 at home without throwing money at parts, you’ll want to follow the steps below for proper diagnosis. Keep in mind this is an intermediate-level diagnosis and repair and not recommended for beginners. Diagnosis requires more specialized equipment beyond what the FIXD Sensor can provide and it can be a time and labor-intensive process for inexperienced DIYers.

DIY difficulty level: Intermediate

This repair requires mechanical knowledge and is not recommended for beginners.

Tools/parts needed (our top picks from Amazon):

  • FIXD
  • Fused power wire
  • Ground wire


Scan your Toyota Tundra to verify P0456 is the only code present. If other codes are present regarding fuel pressure or the fuel system, repair and diagnose those first. If it is paired with P0441, P0440, and/or P0446, there is most likely a solenoid failure, leaking charcoal canister, or a more complex EVAP leak.


Inspect your Toyota Tundra’s gas cap to see if it is loose or damaged. If your gas cap is loose, tighten it and clear the code. Inspect your gas cap for physical damage or deterioration. However, it should be noted that damage to the gas cap or deterioration of its components is not always noticeable. If your gas cap was not loose and you do not see any indications of failure, try replacing the gas cap anyway and clearing the codes. Gas caps are relatively inexpensive and are often the fix for code P0456.


Check for cracked or disconnected EVAP hoses near or connected to the engine air box. Replace cracked/disconnected hoses. Clear the code.


Inspect the fuel tank and charcoal canister for damage and leaks. Replace if necessary.


Check the purge volume control valve for proper operation. This valve is normally not powered on and when at rest, with no power source applied, does not allow air to pass through. It can get sticky, causing leaks.

The purge volume control valve is usually under the hood near the airbox or intake manifold. To test, remove the hoses from either side of the purge volume control valve with the key and engine off. Blow through openings with no power supplied. If you can’t blow through them, they are sealing properly and are most likely not the cause of this medium EVAP leak.


Check the charcoal canister vent control valve for proper operation. This valve is normally not powered on and when at rest, with no power source applied, allows air to pass through. It can get sticky, causing leaks, or the internal solenoid can fail and not operate properly.

The charcoal canister vent control valve is usually connected to the charcoal canister underneath the vehicle. To test, remove the hoses from either side of the charcoal canister vent control valve with the key and engine off, unplug it from the Toyota Tundra, and remove it from the vehicle. Blow through openings with no power supplied. Air should pass through. Now, supply a fused power source to one side and ground to the other of the electrical connector. Blow through the openings again. If you can’t blow through them, they are sealing properly and are most likely not the cause of this medium EVAP leak.


The leak causing code P0456 is often too small to see. If you have completed all of the previous diagnostic steps, a smoke test may be necessary. You can purchase a smoke tester from Amazon to do it yourself, or you may want to take it to a shop to find the leak.

Common Toyota Tundra P0456 Diagnosis Mistakes

Many assume that a loose fuel cap is the only problem and do not perform all the tests necessary to diagnose the full EVAP system. The P0456 leak is a bit trickier to diagnose. Also, Toyota Tundra may have technical service bulletins regarding EVAP codes. Be sure to check if your particular year and model has any technical service bulletins available to save time diagnosing and/or misdiagnosing your Toyota Tundra.

Still Need Help Fixing Toyota Tundra Code P0456?

If you’ve followed the steps above and are still experiencing Toyota Tundra check engine code P0456, please contact the FIXD Mechanic Hotline if you’re a FIXD Premium subscriber or find a RepairPal certified shop near you to get the right repairs at a fair price. Don’t have a FIXD Sensor yet? Click here to get yours for just $19.99, including a free 14-day trial of FIXD Premium!

Fixed It But The Check Engine Light Is Still On?

Check engine light sometimes need to be reset manually, check out our article:

How to Reset Your Check Engine Light | 4 Ways To Clear It (With or Without a Scanner)

FIXD Research Team

At FIXD, our mission is to make car ownership as simple, easy, and affordable as possible. Our research team utilizes the latest automotive data and insights to create tools and resources that help drivers get peace of mind and save money over the life of their car.

Find a Certified Shop

We've partnered with RepairPal to recommend trustworthy shops in your area. Enter your details to see certified shops near you that offer upfront estimates, guaranteed fair pricing, and a minimum 12-month, 12,000-mile warranty.

We’re here to help you simplify car care and save, so this post may contain affiliate links to help you do just that. If you click on a link and take action, we may earn a commission. However, the analysis and opinions expressed are our own.


About the Author

FIXD Research Team

FIXD Research Team

At FIXD, our mission is to make car ownership as simple, easy, and affordable as possible. Our research team utilizes the latest automotive data and insights to create tools and resources that help drivers get peace of mind and save money over the life of their car.

You might also like

Explore Car Resources

car insurance icons

Car Insurance

Find the best insurance deals for your car

Car Buying

Everything you need to know about buying a vehicle

FIXD Team logo

Car Care

Car repair costs, how-to guides, and more

car buying icons

Vehicle Search

Search any make/model for reviews, parts and more