AutoCodes – Infiniti – P0456 Infiniti

P0456 Infiniti Code - EVAP 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 Infiniti indicates EVAP 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 43,566

How popular is this code, among other codes? Medium

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
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Code P0456 Infiniti 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 Infiniti - EVAP Control System Very Small Leak Detected - AutoCodes.com — P0456 Infiniti Code - EVAP Control System Very Small Leak Detected

What does this mean?

What are the Possible Causes of the DTC P0456 Infiniti?

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 Infiniti?

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 Infiniti vehicles.

There is an Infiniti Service Bulletin to help diagnose the P0456 code:
Infiniti Factory Service Bulletin OBDII Code P0456

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0456 Infiniti 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 Infiniti code?

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

Need Help with the Code?

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

Information for Specific Infiniti Models

P0456 2003 Infiniti G35 — EVAP Control System Very Small Leak Detected
P0456 2004 Infiniti G35 — EVAP Control System Very Small Leak Detected
P0456 2005 Infiniti G35 — EVAP Control System Very Small Leak Detected
P0456 2006 Infiniti G35 — EVAP Control System Very Small Leak Detected

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 Infiniti Code

1. What are the common symptoms of OBDII code P0456 in an Infiniti?

- Common symptoms include the check engine light coming on, a slight fuel smell near the vehicle, and possibly difficulties during the refueling process.

2. What are the possible causes of OBDII code P0456 in an Infiniti?

- The code P0456 usually indicates a very small leak in the Evaporative Emission Control (EVAP) system. Common causes include a loose gas cap, cracked or damaged EVAP hoses, or a faulty EVAP purge valve.

3. How serious is OBDII code P0456 in an Infiniti?

- While code P0456 is not typically a serious issue that affects drivability, it is important to address it promptly to prevent potential problems with emissions and to ensure the vehicle passes state inspections.

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

- In most cases, you can continue driving your vehicle with the P0456 code, but it is recommended to have the issue diagnosed and repaired as soon as possible to prevent any further complications.

5. How can I diagnose the source of the very small leak in my Infiniti's EVAP system triggering code P0456?

- A smoke test is commonly used to locate the source of the leak in the EVAP system. This test involves introducing smoke into the system and observing where it escapes to pinpoint the exact location of the leak.

6. Can a loose gas cap trigger OBDII code P0456 in an Infiniti?

- Yes, a loose or improperly sealed gas cap is one of the most common causes of code P0456. Always make sure the gas cap is securely tightened after refueling to prevent this issue.

7. How can I reset the check engine light after repairing the cause of OBDII code P0456 in my Infiniti?

- The check engine light can be reset using an OBDII scanner or by disconnecting the car's battery for a few minutes. However, it is recommended to have the code cleared by a professional to ensure the repair was successful.

8. Is it possible for extreme weather conditions to trigger OBDII code P0456 in an Infiniti?

- Yes, extreme temperature changes can sometimes cause the EVAP system to detect a very small leak, leading to the activation of code P0456. However, the issue typically resolves itself once the system adjusts to normal conditions.

9. What are some DIY repair tips for fixing OBDII code P0456 in an Infiniti?

- DIY repair tips include checking and tightening the gas cap, inspecting EVAP hoses for cracks or damage, and ensuring all EVAP system components are properly connected and functioning.

10. How much does it cost to repair OBDII code P0456 in an Infiniti?

- The cost of repairing code P0456 can vary depending on the underlying cause of the issue. Simple fixes like tightening the gas cap may be inexpensive, while more complex repairs involving EVAP system components could range from $100 to $500 or more.