AutoCodes – Nissan – P0456 2004 Nissan Maxima

P0456 2004 Nissan Maxima 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 2004 Nissan Maxima 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.

Save to My Repairs Step-by-Step Diagnostic Guide My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 3,696

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 25, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0456 2004 Nissan Maxima 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 2004 Nissan Maxima - Evaporative Emission Control System Very Small Leak Detected - AutoCodes.com — P0456 2004 Nissan Maxima Code - Evaporative Emission Control System Very Small Leak Detected

What does this mean?

What are the Possible Causes of the DTC P0456 2004 Nissan Maxima?

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 2004 Nissan Maxima?

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.

There is a factory Nissan service bulletin to help diagnose the P0456 code:
Nissan Factory Service Bulletin OBDII Code P0456

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0456 2004 Nissan Maxima 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 2004 Nissan Maxima code?

Need more information on how to fix the P0456 2004 Nissan Maxima code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0456 2004 Nissan Maxima code diagnosed by a professional: Find a repair shop in your area

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 2004 Nissan Maxima Code

1. What does OBDII code P0456 on a 2004 Nissan Maxima mean?

The code P0456 indicates that the Evaporative Emission Control System has detected a very small leak.

2. What are the common symptoms of OBDII code P0456 on a 2004 Nissan Maxima?

Common symptoms of code P0456 may include the check engine light turning on, a gasoline smell near the vehicle, and potential issues with passing emissions tests.

3. What are the possible causes of OBDII code P0456 on a 2004 Nissan Maxima?

Possible causes of code P0456 include a loose or damaged gas cap, a leak in the fuel tank or fuel lines, a faulty EVAP system purge valve, or a cracked charcoal canister.

4. How can I diagnose the source of the very small leak causing OBDII code P0456 on my 2004 Nissan Maxima?

You can start by checking the gas cap for tightness and any visible damage. Inspect the fuel tank, fuel lines, purge valve, and charcoal canister for leaks or damage. A smoke test may also help pinpoint the exact location of the leak.

5. Can I continue driving my 2004 Nissan Maxima with OBDII code P0456?

It is generally safe to continue driving your vehicle with code P0456, but it is important to address the issue promptly to prevent potential damage to the emission control system and ensure proper vehicle performance.

6. How do I repair OBDII code P0456 on a 2004 Nissan Maxima?

Repairing code P0456 may involve tightening or replacing the gas cap, repairing or replacing damaged components in the EVAP system, clearing the code with an OBDII scanner, and driving the vehicle to see if the code returns.

7. How much does it typically cost to fix OBDII code P0456 on a 2004 Nissan Maxima?

The cost of fixing code P0456 can vary depending on the specific issue causing the leak and whether you choose to perform the repairs yourself or take your vehicle to a mechanic. Costs may range from a few dollars for a new gas cap to several hundred dollars for more extensive repairs.

8. Will resetting the check engine light clear OBDII code P0456 on a 2004 Nissan Maxima?

Resetting the check engine light may temporarily clear the code, but if the underlying issue causing code P0456 is not addressed, the code is likely to return. It is important to diagnose and fix the root cause of the problem to prevent future issues.

9. How long does it typically take to fix OBDII code P0456 on a 2004 Nissan Maxima?

The time it takes to fix code P0456 can vary depending on the complexity of the issue and the availability of parts. Simple fixes like tightening a gas cap can be done in a matter of minutes, while more involved repairs may take several hours or more.

10. Can extreme weather conditions affect the occurrence of OBDII code P0456 on a 2004 Nissan Maxima?

Extreme temperature changes or weather conditions can sometimes exacerbate issues with the EVAP system, potentially leading to the triggering of code P0456. It is important to keep your vehicle well maintained and address any leaks promptly, especially in harsh weather conditions.