One of the most common trouble codes with the Jeep Cherokee is the P0456 code. This trouble code references a number that is given to you when you plug your Cherokee into a OBDII scanner. P0456 Indicates that there is a small leak in the evaporative emission control system. It often appears with, or is related other codes, such as P0420, P0441, and very often P0440.
P0456 is normally not an immediate threat to the drive-ability of your Cherokee. Certainly anytime the service engine soon light is on, it’s good to deal with it as soon as possible.
While the trouble code may state that there is a “small leak” in the EVAP system of your Jeep Cherokee, it is actually referring to the amount of pressure lost, and not the physical size of the leak. These leaks can be really small.
Jeep Cherokee P0456 Definition
P0456 is a universal OBDII trouble code. This means that regardless of which make or model of vehicle, the code will mean the same thing (Cherokee or not). The code technically stands for:
System Small Leak – Evaporative Emission System
The EVAP system captures all fuel vapor from the fuel tank and sends them to the engines intake in order to be ignited in the normal combustion process. When there is a small leak in the Jeep Cherokee’s EVAP system, it will throw the P0456 OBDII Code. If there is a large leak, it’ll throw P0455.
Jeep Cherokee P0456 OBDII Code Symptoms
P0456 code will typically not be accompanied by any noticeable symptoms other than the smell of gas and the service engine soon light.
You should particularly notice the smell of fuel around the fuel tank area or fuel filler tube.
The EVAP system deals directly with fuel vapors. If these vapors are leaking from the system, you’ll often smell them faintly while operating the vehicle. But, it won’t affect the way the engine itself runs. The EVAP system deals with fuel vapor, and not the running of the engine in your Cherokee.
Cherokee P0456 Trouble Code Causes
There are many things that can cause the P0456 trouble code to trigger in your Jeep Cherokee. If your Cherokee has warned you at all in the last few months that the fuel cap was off when it wasn’t, then replacing it would be a great first step.
Here are the most common problems that will throw the code, presented in order (somewhat) from most to least likely:
- Evap System Hose– The hose that carries the fuel vapor from the fuel tank to the intake manifold can begin to leak. This will cause the P0456 code. Look for either a tear or hole in it. This is one of the most common issues that causes the code.
- Vapor Canister Purge Valve– One of the most common causes of the P0456 code is the vapor canister purge valve. It’s really easy to replace. There are a few clips that you need to find and remove.
- Fuel Tank Sending Unit– It is possible for the gasket that attaches the fuel sending unit to the gas tank to go bad. This can reduce tank pressure and throw the code.
- Fuel Cap– A bad fuel cap can cause the code to be thrown for sure. Often, you’ll get a message informing you that the fuel cap is off even when it is on. If you are getting that message, plus a P0456, it may save you a ton of time and money to replace the fuel cap and see if it goes away.
- Fuel Filler Neck– There is often a gasket where the fuel filler neck connects with the gas tank. This gasket can dry out, especially with vehicles that spend their time in dry climates. When it dries out, the fuel tank can’t hold pressure anymore.
P0456 Diagnosis- Jeep Cherokee
A mechanic has a wide range of instruments at his disposal to diagnose what would be causing the P0456 in your Jeep Cherokee. Here are the most common things that are done to diagnose the code:
- The mechanic will typically check to see if there are any other trouble codes. The more trouble codes there are, the easier it can be to diagnose a problem. That’s because when they appear together in certain combinations, there will often only be only a few conditions that will throw any combination of codes at one time.
- After ascertaining what trouble codes appear with the P0456, the mechanic will typically inspect the EVAP system. This includes the purge valve, line, and canister.
- The mechanic will inspect the gas cap to make sure that it can handle pressure. If you are getting a warning that your gas cap is off, even when it’s on, replacing it will more than likely clear this code.
- The fuel tank pressure will be checked and monitored.
- After for the checks and fixes listed above, the mechanic will perform two tests:
- A smoke test, and they’ll use a scan tool to confirm that the EVAP solenoids and valves are operating properly.
Here’s a pretty good video on diagnosing these leaks from Scotty Kilmer, if you are interested:
Most Common P0456 Fixes
Here are the most common Cherokee P0456 fixes:
- Gas cap replacement
- EVAP line replacement
- Replace charcoal canister
- Replace the fuel tank
Of all the items listed above, it would be wise to start with the gas cap and work your way to the fuel tank, since the gas cap is far and away the easiest and least expensive items to replace on here.
Here’s a great video on how to test your gas cap.
Good luck figuring out what is causing your Jeep Cherokee to throw the P0456 code. We hope this helps. If there is anything that you feel like you could add, please feel free to leave a comment below.
Is P0456 a Serious Concern?
While P0456 is not going to cause the Cherokee’s engine to stop running, it should not be treated lightly. You could have a fuel leak. Pay extra attention to your tank level and make sure you are not leaking fuel. We recommend taking it in and/or dealing with it right away.
If you feel like there is anything that you could add to this article, please leave a comment below. Thanks!
Jeep P0456 – Meaning, Causes, Symptoms, & Fixes
Jeep Code P0456 Definition
Evaporative emission control system leak (small).
Jeep Code P0456 Meaning
The evaporative emission control (EVAP) system in your Jeep 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 valve. Both the vent control valve and the purge valve are usually open when the engine is at normal operating temperature. However, the ECM occasionally performs leak tests 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 create a vacuum. If the EVAP system does not maintain the pressure, the ECM recognizes an evaporative emission control leak. In the case of P0456 for your Jeep, it is a small sized leak, smaller than .020” in diameter.
Jeep P0456 Symptoms
- Check Engine Light is on
- Decreased fuel economy
- Fuel smell
Jeep P0456 Causes
- Loose or damaged gas cap
- Leaking or disconnected EVAP hose
- Faulty purge valve
- Faulty canister vent valve
- Charcoal canister leak
- Leaking fuel tank
Jeep Code P0456 Severity – Low
It is unlikely the driver will notice any symptoms with Jeep check engine light code P0456 other than a slight odor of fuel, decreased 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.
Jeep Code P0456 Common 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. Make sure to perform the full range of tests in order to properly diagnose the problem.
Jeep Code P0456 Diagnosis Steps
How To Diagnose P0456 For Your Jeep
- Scan your Jeep 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, then there is most likely a solenoid failure, leaking charcoal canister, or a more complex EVAP leak.
- Inspect your 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 are not always noticeable. If your gas cap was not loose and you do not see any indications of failure, try replacing the gas cap anyways and clearing the codes. Gas caps are relatively inexpensive and are often the fix for code Jeep P0456.
- Check for cracked or disconnected EVAP hoses near or connected to engine air box
- Replace cracked/disconnected hoses
- Clear code
- Inspect the fuel tank and charcoal canister for damage and leaks. Replace if necessary.
- Check both the charcoal canister vent valve and purge valve for proper operation. These valves can get sticky causing leaks or the internal solenoid can fail and not operate. To test:
- Disconnect the valve connector and test that the valve is receiving power with a multimeter
- If there is no power, there is most likely a wiring problem or a faulty powertrain control module.
- Disconnect the valve connector and test that the valve is receiving power with a multimeter
- The leak causing Jeep code P0456 is often too small to see. If you have completed all of these 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.
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P0456 JEEP Code - EVAP System Small Leak
Engine-Codes - Jeep - P0456 JEEP
Repair Importance Level: 1/3
Repair Difficulty Level: 3/3 What is this?
What does this mean?
|P0456 JEEP code 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
|How is the P0456 JEEP code repair?Start by checking 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.
|What is the cost to diagnose the P0456 JEEP code
Labor: 1.0The cost to diagnose the P0456 JEEP code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
|When is the P0456 JEEP code detected?Malfunction is detected when EVAP control system has detected a very small leak.
|What are P0456 JEEP code possible symptoms?
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors
|What is P0456 JEEP code meaning?The Evaporative emissions system is design to prevent the escape of fuel vapors from the fuel system. Leaks in the system, ca allow vapors to escape into the atmosphere. The leak detection system tests for EVAPsystem leaks and blockage.
During the self-diagnostics, the Powertrain Control Module (PCM) first checks the Leak Detection Pump (LDP) for electrical and mechanical faults. If the first checks pass, the PCMthen uses the LDP to seal the vent valve and pump air into the system to pressurize it. If a leak is present, the PCMwill continue pumping the LDP to replace the air that leaks out. The PCMdetermines the size of the leak based on how fast/long it must pump the LDP as it tries to maintain pressure in the system.
|Need more information with the P0456 JEEP code?Need more information on how to fix the P0456 JEEP code?
Get Access to Factory Service Manuals
1=Low 2=Medium 3=High What is this?Repair Difficulty Level:3
1=Easy 2=Moderate 3=Hard What is this?
Browse Codes for Specific Model-Year
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