P1456 Honda? (Perfect answer)


  • P1456 is a very common trouble code in vehicles made by Honda. It is a Honda specific code, which means that it has the same meaning in any vehicle manufactured by Honda (including Acura). P1456 is typically caused by a faulty or loose gas cap, although there are other issues that can cause it as well.

How do I fix code P1456?

Should the code return, verify that you are using the correct filler cap for your application. Also, clean the cap and seal to make sure debris isn’t causing any problems. Common causes of the P1456 code include:

  1. Missing fuel cap.
  2. Incorrect fuel filler cap.
  3. Open fuel filler cap.
  4. Substance in fuel filler cap.

What does P1456 mean?

Error Code P1456 is described as a Evaporative Emission Control System Leak. This means there’s a leak problem in the EVAP (Evaporative Emission Control System), particularly on the tank side, and the engine’s computer has detected the issue.

What does Engine code P1457 mean?

Error Code P1457 is defined as Evaporative Emissions Control System Leakage EVAP Canister System. This error code is a manufacturer-specific trouble code, meaning it does not apply to all vehicles makes. Rather, it applies only to specific vehicle makes, such as Honda.

How does Honda EVAP system work?

The EVAP system controls the pressure inside the tank with two valves on most Honda models. The other valve allows air into the tank to equalize pressure, or it can direct the vapors into the charcoal canister so they can be burned off later. This valve is called the canister control solenoid or valve.

Where is the fuel tank pressure sensor located?

The fuel tank pressure sensor is part of the fuel pump assembly and is mounted on top of the tank or inside the tank. It’s part of the evaporative emissions system (commonly referred to as “EVAP”) and reads pressure in the fuel system to detect evaporative leaks, such as a loose or faulty gas cap.

What is code P0420 Honda?

Code P0420 indicates that the catalytic converter is not functioning efficiently, therefore increasing the output of harmful pollutants by your Honda.

What are the symptoms of a faulty EVAP purge solenoid?

Symptoms of a Bad or Failing Canister Purge Solenoid

  • Rough Idle.
  • Poor Engine Performance.
  • Difficulty Starting.
  • Check Engine Light Comes On.
  • Low Fuel Economy.

Will an EVAP code clear itself?

If the condition that caused it to come on is a minor fault, and stops occurring, then yes, it will clear itself. If the condition indicates a larger problem, then it will stay on until cleared manually.

What are the symptoms of a bad EVAP canister?

But what happens when the EVAP canister goes bad? The prominent symptoms include: check the engine light turning on, hissing noise when opening the fuel tank, smell of fuel inside the cabin, issues with filling up the tank, and excessive smoke coming from the exhaust pipe.

Can I drive with a bad EVAP?

Is it Safe to Drive with an EVAP Leak? Most drivers tend to ignore a check engine light, at least until their next service visit. But because an EVAP leak can potentially be a severe and environmentally damaging problem, it’s not a good idea to keep driving with the check engine light on.

What causes an EVAP leak?

The most common causes for EVAP leaks include bad seals and O-rings, a failing purge valve, a damaged hose or vent, or a defective leak detection pump. As you might have guessed, there’s no real way to prevent one of those components from failing unless you’d like to regularly replace components of your fuel system.

Honda Engine Codes – P1456

Leakage from the Evaporative Emissions Control System and the Fuel Tank What it signifies is as follows: The OBD-II code P1456 on your Honda indicates that there is an issue with the EVAP control system. To prevent gasoline vapors from leaking into the environment, your Honda’s EVAP control system temporarily traps them in a canister. The fuel is subsequently taken into the engine through the intake manifold and burnt in the combustion chamber. Additionally, the onboard refueling vapor recovery system (ORVR), which stores fuel vapors generated during refueling in the EVAP canister, helps to reduce greenhouse gas emissions.

EVAP control system leak detection technique enhances the accuracy and frequency of detection by identifying problematic components as well as vapor leakage, which helps to improve the overall system performance.

The following are some of the most common reasons of the P1456 error code:

  • Fuel cap not present
  • Incorrect fuel filler cap present
  • Fuel filler cap open
  • Substance in fuel filler cap present

If you have this code, you should be aware that it is a rather simple remedy. Begin by doing a visual examination to ensure that your cap is present and securely fastened in position. If everything looks to be in working order, try resetting the code and continuing with troubleshooting from there. If the code returns, double-check that you’re using the right filler cap for your application before proceeding. Also, thoroughly clean the cap and seal to ensure that dirt is not creating any issues.

This article is not intended to be a comprehensive repair manual for the problem code P1456, but rather to provide an explanation of the code.

Honda Civic P1456: EVAP Leakage (Fuel Tank)

P1456 is a problem code that is frequently seen in Honda automobiles. The fact that it is a Honda-specific code implies that it will have the same meaning in every car built by the company (including Acura). In most cases, a malfunctioning or loosegas cap is the source of the problem, but there are a variety of additional factors that might contribute to it. We’ll have a look at the ones that are listed below.

P1456 Symptoms Honda Civic

The smell of gasoline is one of the most common symptoms of P1456, as is P1456. Essentially, it is informing you that the Civic’s diagnostic computer believes the EVAP leaking is originating from the gasoline tank, which is why beginning with the fuel cap is a sensible choice.

Honda Civic P1456 Causes

As previously indicated, the most typical cause of P1456 is either a malfunctioning, loose, or missing fuel cap, or a combination of the two.

If that isn’t the case, the EVAP system will almost always be the culprit. Every model year will undoubtedly have its unique set of conditions, but these are the most frequent causes of P1456 in the Honda Civic in general, regardless of the year you are using.

  • P1456 Fuel Cap – The fuel cap is the ideal spot to start your investigation into the P1456 code. There are several possibilities for why the code was thrown. It is also the least expensive and easiest to replace of the three possible reasons. Here is an excellent video that demonstrates how agas cap may result in problem codes. Gas caps are notorious for failing to tighten properly when they become corroded. It’s possible that you’re receiving a notification telling you to tighten the gas cap. Here’s an excellent article on the signs and symptoms of a faulty gas cap
  • Filler neck and fuel input – A visual inspection of the gasoline filler neck to determine whether there is any damage or debris that might be preventing the fuel cap from establishing a tight seal is absolutely recommended. It will be necessary to use an O-ring to connect the gasoline filler neck to the gas tank. Unless it has been dried out or cracked, the gasoline tank will no longer be able to pressurize, resulting in the P1456 error code being shown
  • A system that transports gasoline vapor from the fuel tank to the intake manifold is known as an Evaporative Emissions Control System (EVAP). If it develops a leak, it will frequently emit codes such as P0455, P0456, or P0457, which indicate that the leak has occurred. The presence of these codes indicates the presence of an EVAP leak. Each of them indicates a different size leak, and that is the only variation between them. When the EVAP system is leaking, it might cause the P1456 error code to be displayed since it would depressurize the gasoline tank in a similar manner to a missing gas cap. Watch this video to learn how to test the EVAP vent canister Valve with P1456 in a Honda manufactured car.
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The majority of the time, changing the gasoline cap will resolve the P1456 error. It is possible that the car will take some time to reset the code. Make careful to give it a few minutes of driving time before inspecting the fuel filler neck or checking the exhaust gas recirculation system. If you have anything to contribute, please leave a remark in the section provided below. Wishing you the best of luck!

Honda Check Engine Light DTC P1456, What Causes it, and How to Fix it!

With You in Mind, We Designed This Website! courtesy of Eddie Carrara

The most common cause of a Honda check engine light being on is a DTC P1456, and a loose or missing gas cap usually causes the problem. The loose gas cap isn’t the only reason, though. A leak on the evaporative system’s tank side causes the code or DTC 1456 to display in the computer’s data list. It could also mean a leak in the fuel tank or one of the tubes or hoses.

What to Do if the Check EngineLight Comes on After Refueling

So if your Honda check engine light comes on after refueling your vehicle, the first thing you should check is the gas cap. Check to see if it’s missing; if it’s not missing, make sure the gas cap is tight by making sure it clicks three times after it has stopped turning. Once you have checked the gas cap condition, the vehicle has to run through two driving cycles and two complete tests on the evaporative system before the light will go out on its own. If the vehicle passes both tests, the check engine light will go off, and the DTC P1456 clears until the next fault occurs.

Evaporative System Tests and Drive Cycles

A drive cycle is defined as the period of time during which the engine is completely cold and then runs until it reaches operating temperature; this is one driving cycle. In the course of the drive cycle, the vehicle computer will conduct an examination of the evaporative system. The computer will create a vacuum in the fuel tank and measure the voltage through the use of a pressure sensor installed in the fuel tank. As soon as the tank begins to lose vacuum during the testing process, the computer detects a voltage drop at the FTP sensor and switches on the check engine light to indicate that a leak has occurred.

The use of a scan tool to manually clear the codes is another option, although it is not essential.

What if the Check Engine Light Never Goes Out?

A malfunctioning gas cap or other difficulties with your Honda are most likely to blame if your check engine light never goes off and the gas cap is securely in place and well sealed. I urge that you select an automobile shop or dealership that has the equipment necessary to correctly diagnose the problem, rather than simply pulling a code and guessing at the origin of the problem. To inspect the emission system, Honda dealers have diagnostic tools available; these diagnostic tools may conduct the evaporative test using the scan tool without requiring the vehicle to go through the driving cycles.

Being equipped with the proper tools for the mechanic’s job is essential, and most small businesses will not spend the money on more advanced equipment.

Although the hourly fee at a dealership may be more than that of a small shop, this is because they have the required tools and information to repair your car; nonetheless, you must still choose the most qualified mechanic for the job.

Thanks for your cooperation.

What’s Inside a Honda CanisterVent Shut Valve

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How to reset the computer to clear OBD II code P1456

February 26, 2004, 10:43 p.m. Starter of the threadJoined the forum in February 2004 Number of posts: 4 No likes have been received, and no likes have been given on any of the posts. How to delete the OBD II code P1456 from the computer by resetting it Dear Sir or Madam, I would want to know whether there is a way to manually reset the computer system of the Honda Civic 99 model in order to clear the P1456 problem code. Leakage from the Evaporative Emissions (EVAP) Control System (P1456) (Fuel Tank System) As a result of this code, my automobile failed the smog functional test.

  • However, even though it is now present, the automobile computer is still unable to recognize it.
  • Thanks Sumit February 26, 2004, 11:17 p.m.
  • Location: Gaithersburg, Maryland/Formerly Cali, California, United States Number of posts: 1,326Likes received: 0Likes received: 0Likeson 0 comments have been made.
  • Next time, try searching for the answer yourself, like I did when I first asked the question.
  • February 26, 2004, 11:31 p.m.
  • February 26, 2004, 11:58 p.m.
  • How to delete the OBD II code P1456 from the computer by resetting it (h2392si) Thank you for responding so quickly.
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Thank you.

on Tuesday, February 26, 2004 Thread Starter is a command that initiates a thread.

How to delete the OBD II code P1456 from the computer by resetting it (timmy8151) Thank you for responding so quickly.

thanks, The time now is 10:57 a.m.

Honda-Technical Committee Member Date of joining: October 2001 Severn, Maryland is the location.

How to delete the OBD II code P1456 from the computer by resetting it (timus) TABLE WIDTH=”90 percent” CELLSPACING=”0″ TABLE WIDTH=”90 percent” CELLSPACING=”0″ CELLPADDING=0 ALIGN=CENTERTRTD The following quotation was originally submitted bytimusraquo;/TD/TRTRTD CLASS=”quote” I’d appreciate it if you could share specifics on where the negative battery cable is located in the vehicle./TD/TR/the TABLEIt’s cable that connects your battery to the frame.

  1. The average length is 8-10″ in length.
  2. Date of joining: November 2003Location: California, United States 335 total posts No likes have been received, and no likes have been given on any of the posts.
  3. I believe it is raio back up or anything along those lines.
  4. 04:55 p.m.
  5. Posts by son0 How to delete the OBD II code P1456 from the computer by resetting it (boostn420) Thank you very much to everyone.
  6. I’m hoping that the car will now pass the smog test.
  7. achid Honda Civic (also spelled Honda Civic) is a mid-size automobile manufactured by Honda (2006 – 2015) 22nd of March, 2008, 10:26 a.m.

94DC 2008-02-08 5:32 PM (TegAcura TSX408) HRDCORD Honda Accord (1990-2002)505-05-2005 Honda Accord 11:21 a.m. to 12:00 p.m. 2004,civic,clear,cleared,code,codes,computer,error,fail,fault,honda,ii,obd,obd2,p1456,reset,resetting,smog

P1456 – Evaporative emission (EVAP) canister purge system (fuel tank system) – leak detected (Honda) – TroubleCodes.net

Trouble Code Fault Location Probable Cause
P1456 Evaporative emission (EVAP) canister purge system (fuel tank system) – leak detected Hose, fuel tank/pressure sensor, fuel filler cap, EVAP valve/bypass solenoid, EVAP two way valve, EVAP canister/vent valve

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What Does Code P1456 Mean?

Fault code for the OBD II This is a manufacturer-specific code defined by Honda as “Evaporative Emissions (EVAP) Control System Leakage (Fuel Tank System)” and is set on these applications when the PCM (Powertrain Control Module) detects a leak in the EVAP (Evaporative Emissions) control system. P1456 is set on these applications when the PCM (Powertrain Control Module) detects a leak in the fuel tank system. When used in any application, the aim of the EVAP system is to trap and contain gasoline vapors inside the system until conditions are sufficient that the trapped vapors may be transferred to the engine and burn as part of the air/fuel combination.

  • It is important to note that while the EVAP system is not in purge mode, both the vent and purge valves are closed, resulting in a complete seal between the fuel system and the atmosphere.
  • When this occurs in a properly working system, the ECU opens both the purge valve and the vent valve, allowing engine vacuum to suck the collected gasses into the engine and preventing the system from overheating.
  • Nonetheless, because a fully working EVAP system is a legal requirement in the majority of areas, automobile manufacturers have devised a variety of ways for detecting leaks in the system.
  • The PCM can determine the size of the leak based on how quickly the vacuum decays once the purge valve is closed.
  • The PCM can also determine the amount of the leak based on how quickly the pressure decreases once the pump is turned off.
  • The PCM can compute the magnitude of the leak based on the change in the temperature of the vapor being emitted.

While the existence of a leak in the EVAP system will not normally impair driving abilities, a leak will result in the storage of code P1456 and the illumination of a warning light in the instrument cluster. It is also possible that the application may fail a mandatory emissions test.

Where is the P1456 sensor located?

The schematic diagram of the EVAP system, which is found on the majority of Honda vehicles, is shown in the figure above. Keep in mind that, while all of the parts listed are typical leak sites, the region enclosed by the red oval represents the most common leak sites that are associated with the Honda code P1456 on the following Honda models:

What are the common causes of code P1456?

On the Honda models mentioned above, the most typical cause of code P1456 is a problem in the fuel filler cap that prevents the filler cap from seating properly. In light of the fact that this issue has been corrected in the ensuing years, additional possible sources of this code include the following:

  • Hoses that have been perforated or otherwise damaged. It is important to note that EVAP hoses used in Honda applications are not recognized for their great quality, which means that practically any hose used in these applications has the potential to leak at any time. EVAP vent valve that is not working properly
  • Vapor recirculation valve that is not working properly
  • Fuel tank pressure sensor that is not working properly

BAT Team Discussions for P1456

There were none found. P1456 has a question? Ask it here.


14th of June, 2006, 01:43 p.m. Date of joining: May 2006 Location: Posts: a total of 80 Regarding p1456 Before you get too far ahead of yourself, this is what Honda has to say about this code: A leak in the Evaporative Emission (EVAP) control system has been discovered (fuel tank system). This indicates that the computer has detected a leak in the fuel system. Hondas (with an EVAP system) are equipped with a gasoline tank pressure sensor, which will alert the driver if there is no pressure building up in the tank as a result of a leak.

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This failure code is set around 99 percent of the time because the gas cap has failed or because it has not been properly tightened, which, as a result, prevents pressure from building up.

If it turns back on, replace your gas cap, which costs a pittance of $8, and repeat the process.

Help! P01456/p1456 error!

Potentially useful solutions for the P1456 DTC error code Hopefully, my experience in tackling this difficult issue will be of use to someone else who is in a similar situation. It should be a simple repair for any do-it-yourselfer. However, you should not attempt this if you are unsure of what you are doing or if you are uncomfortable with messing with your gasoline lines or system. the history of the problem: I had this P1456 code pop up on my computer, which stopped me from having my 2003 Pilot smog checked (and renewing its registration) because it had 203k miles on it.

  1. However, the error code remained the same.
  2. My difficulty is that I didn’t have enough time to purchase and repair the necessary parts before the automobile needed to be smogged and registered.
  3. The steps I took were as follows: 1.
  4. Likewise, remove the two bolts that support the metal bracket/shield structure that secures the solenoid/valve assembly to the vehicle.
  5. Connect the two connections (one for solenoid and another for sensor) as shown in Figure 2.
  6. These were not disconnected by me.
  7. Disconnect the bypass solenoid from the two-way valve by removing the four screws that hold them together (really, just two screws keep them together, with the remaining two screws securing the bypass solenoid to the metal bracket/shield construction).

Take off the two O-rings and thoroughly clean them (I used wet paper towel).

Additionally, I banged the solenoid many times against something hard to loosen it up in case something was causing it to become stuck.


That’s all there is to it!

And there you have it!

I also had no trouble registering my car!

I am aware that the bypass solenoid may be nearing the end of its useful life after more than 200k miles and may need to be replaced at some point.

Moreover, it is continuing to function as usual. The very first thing I will do if I ever receive a P1456 (or even a P1457, which is particularly directed at a defective bypass solenoid) is to check that, and I will most definitely replace it if I do. I hope this has been of assistance.

What’s the 2005 honda civic code p1456?

P1456 codes are returned in a 2005 Honda Civic when there is a problem with some aspect of the evaporative emission control (EVAP) system, which implies the vehicle is not running properly. In the majority of situations, the canister is to blame, however the solenoid might also be to blame. By holding vapors in a canister, the EVAP system prevents vapors from infiltrating the surrounding environment. After being drawn into the engine via the intake manifold, it is burnt as a byproduct of combustion.

  1. Poor engine performance, difficulties starting the engine, rough idling, gas odor, failed emission test, and difficulty filling the tank are all possible symptoms.
  2. Replace the EVAP canister in a 2005 Civic on average costs between $210 and $240.
  3. Ernest P.
  4. The code p1456 on a 2005 Honda Civic indicates that there is a leak on the tank side of the evaporative system.

Code # P1456.

The 23rd of January, 2003Extreme MemberThread Starter Date of joining: November 2001Location: Houston, Texas, United States Number of posts: 1,271Likes: 0Received a single like on a total of 0 posts Power of Representation: 0 CodeP1456. Hello everyone, I just returned from Autozone because my check engine light was up, and after inspecting my ecu, they determined that the code for the problem was P1456. It was explained to me by Honda that this was the code indicating an evaporative leak, also known as a gas cap loose.

The gas cap was a little loose previously because I could smell gas surrounding it, but the light is still on even after I tightened it all the way.

Or will taking it into Honda for further investigation be required?

Honda has stated that they would charge $70 to check it out, and I personally do not want to spend that much money on something I do not need.

Premium Member since January 23, 2003 Hey!

I’ve decided to become a Supporting Member!

The number of likes received is 0, and the number of likes received is 0 for the number of posts.


Power of Representation: 0 It’s most likely a “keep alive” code, which means that even if the problem is resolved, the code will continue to function.

It’s possible that simply disconnecting the battery will not be sufficient; you may need to have autozone use their reader and erase it.

iTrader (Internet Trader): (1) Date of joining: December 2002Location: Orlando, Florida Age: 38 years Number of posts: 440 Comments: 0Received 0 Comments: 0 0 comments have been made.

I drove for a few days without a cap and the light illuminated; it took a few days to turn off.

Comments: 0Received 0 Comments: 0 0 comments have been made.



It’s not a huge problem.

Autozone and other similar stores carry replacements.

When in doubt, get it checked out another time.

Because of the expansion and contraction of either the plastic or the metal on the body, it appears that the outside temperature is also a contributing factor.

Just keep an eye on it, and if you have a skilled technician, ask him or her to clear the code for you if necessary.

iTrader (Internet Trader): (11) Date of joining: November 2005 Dallas, Texas is the location.

0 Likes have been received.

After a few hours of driving, it is typically best to get off the road.

Forum for the Honda CivicRepliesLast Post SimpleUserEngine604-24-2021 The time is 3:54 a.m.

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