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P0456 Nissan Code - Evaporative Emission Control System Very Small Leak Detected

Quick Answer

This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using 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 Nissan indicates Evaporative Emission Control System Very Small Leak Detected.
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.
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Code Popularity 135,230
How popular is this code, among other codes? Medium
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Table of contents Created and updated by William Orellana on Mar 25, 2024
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Code P0456 Nissan 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 Nissan - Evaporative Emission Control System Very Small Leak Detected - AutoCodes.com
P0456 Nissan Code - Evaporative Emission Control System Very Small Leak Detected
What does this mean?

What are the Possible Causes of the DTC P0456 Nissan?

  • 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 Nissan?

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.

What does this mean?

Code Tech Notes

The fuel tank filler cap and the Purge Volume Control Valve are the more common problems that will trigger the P0456 code on Nissan vehicles.

Nissan models with factory service bulletin:

All Nissan Models 2008 and newer OBDII Code P0456:
All Nissan Models 2008 and newer OBDII Code P0456

All Nissan Models 2012 and newer OBDII Codes P0442, P0455, P0456:
All Nissan Models 2012 and newer OBDII Codes P0442, P0455, P0456

All Nissan Models 2007-2011 OBDII Codes P0442, P0455, P0456:
All Nissan Models 2007-2011 OBDII Codes P0442, P0455, P0456

2005-2007 Nissan Pathfinder
2005-2007 Nissan Pathfinder Service Bulletin OBDII Code P0456

2007-2009 Nissan Altima Sedan
2008-2009 Nissan Altima Coupe
2007-2009 Nissan Altima Hybrid
2009 Nissan Maxima
Nissan Factory Service Bulletin OBDII Code P0456

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0456 Nissan 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.

Need more information about the P0456 Nissan code?

Need more information on how to fix the P0456 Nissan code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0456 Nissan code diagnosed by a professional: Find a repair shop in your area

Information for Specific Nissan Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0456 Nissan Code

1. What are common symptoms of OBDII code P0456 in a Nissan vehicle?

- Common symptoms include the check engine light illuminating on the dashboard, a slight gas smell near the vehicle, and potential issues with passing emissions tests.

2. What are some possible causes of OBDII code P0456 in a Nissan?

- The code can be triggered by a loose gas cap, a cracked or damaged EVAP system hose, a faulty EVAP purge valve, or a malfunctioning EVAP canister.

3. How serious is OBDII code P0456 in a Nissan?

- While the code typically indicates a minor leak in the evaporative emission control system, it is still important to address it promptly to ensure proper vehicle performance and emissions compliance.

4. Can I continue driving my Nissan with OBDII code P0456 present?

- In most cases, it is safe to continue driving the vehicle with this code, but it is advisable to have the issue diagnosed and repaired as soon as possible to avoid potential long-term problems.

5. How can I diagnose and repair OBDII code P0456 in my Nissan?

- Start by checking the gas cap for tightness and any visible signs of damage. Inspect the EVAP system hoses and components for leaks or damage. If needed, consult a professional mechanic to further diagnose and repair the issue.

6. Is it possible to reset the check engine light after fixing OBDII code P0456 in a Nissan?

- Yes, once the underlying issue triggering the code has been resolved, the check engine light can typically be reset using an OBDII scanner or by disconnecting the car battery for a few minutes.

7. Are there any DIY tips for preventing OBDII code P0456 in a Nissan?

- Regularly checking and tightening the gas cap, avoiding overfilling the fuel tank, and ensuring the EVAP system components are in good condition can help prevent the occurrence of this code.

8. Can extreme weather conditions affect the likelihood of OBDII code P0456 in a Nissan?

- Yes, extreme temperature fluctuations or driving in very hot or cold climates can sometimes exacerbate issues with the EVAP system, potentially leading to the triggering of this code.

9. Will OBDII code P0456 in a Nissan affect the vehicle's fuel efficiency?

- While the code itself may not directly impact fuel efficiency, addressing the underlying issue causing the code can help ensure optimal performance and fuel economy in the long run.

10. How much does it typically cost to repair OBDII code P0456 in a Nissan?

- The cost of repairing this code can vary depending on the specific cause and the labor rates of the repair shop, but it is generally considered a relatively minor and affordable repair compared to other potential issues.

Discuss the causes and fixes for P0456 Nissan OBDII Code

Submit a New Comment

  • I had this code on my 2002 Nissan Altima, changed new OEM filler cap and didn't work so I bought the canister vent vlave and canister purge volumen control solenoid. I changed the easy one first purge volumen control solenoid that is located on the manifold behind the throttle body, drive the car 34 miles and shut it off and after half hour start it again and my check engine light was off itself so the good luck was I didn't need go under the car and my other part will be save for future problem with this part of the emission.

    Reply to Comment

  • Thanks for sharing!!

    Reply to Comment
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