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P0456 2004 Infiniti G35 Code - EVAP Control System Very Small Leak Detected

Quick Answer

The P0456 code on a 2004 Infiniti G35 indicates that the vehicle's onboard diagnostics system has detected a very small leak in the EVAP (Evaporative Emission Control) system. Common causes include Loose Gas Cap: The most common cause of the P0456 code is a loose or improperly sealed gas cap, Cracked or Disconnected Hoses: Damage to the hoses that connect various EVAP system components can lead to leaks, Faulty Purge Valve: A malfunctioning purge valve can cause the system to not seal properly. 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 Infiniti G35 indicates EVAP Control System Very Small Leak Detected.
Common causes
Common causes include Loose Gas Cap: The most common cause of the P0456 code is a loose or improperly sealed gas cap, Cracked or Disconnected Hoses: Damage to the hoses that connect various EVAP system components can lead to leaks, Faulty Purge Valve: A malfunctioning purge valve can cause the system to not seal properly.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0456 2004 Infiniti G35 Description

The P0456 code on a 2004 Infiniti G35 indicates that the vehicle's onboard diagnostics system has detected a very small leak in the EVAP (Evaporative Emission Control) system. The EVAP system is responsible for capturing and storing fuel vapors that would otherwise be released into the atmosphere, reducing harmful emissions. A very small leak can lead to increased emissions and decreased fuel efficiency. This code does not typically affect the vehicle's performance drastically, but it can lead to long-term issues if left unresolved.

OBDII Code P0456 2004 Infiniti G35 - EVAP Control System Very Small Leak Detected
P0456 2004 Infiniti G35 Code - EVAP Control System Very Small Leak Detected

Common Causes of P0456 2004 Infiniti G35

  1. Loose Gas Cap: The most common cause of the P0456 code is a loose or improperly sealed gas cap.
  2. Cracked or Disconnected Hoses: Damage to the hoses that connect various EVAP system components can lead to leaks.
  3. Faulty Purge Valve: A malfunctioning purge valve can cause the system to not seal properly.
  4. Charcoal Canister Leak: A leak in the charcoal canister can also trigger the P0456 code.

Symptoms of P0456 2004 Infiniti G35

  1. Check Engine Light: The most common symptom associated with the P0456 code is the illumination of the check engine light on the dashboard.
  2. Fuel Smell: A very small leak in the EVAP system may sometimes result in a noticeable fuel smell around the vehicle.
  3. Decreased Fuel Efficiency: Since the EVAP system is related to fuel vapors, a leak can lead to decreased fuel efficiency.
  4. Failed Emissions Test: If the P0456 code is not addressed, it may cause the vehicle to fail emissions tests in states where this is required.

How to Fix P0456 2004 Infiniti G35

  1. Check Gas Cap: Start by checking the gas cap to ensure it is properly sealed. Tighten or replace the gas cap if necessary.
  2. Inspect EVAP System: Inspect all hoses, connections, and components of the EVAP system for any signs of damage or leaks.
  3. Test Purge Valve: Test the purge valve to ensure it is functioning correctly. Replace if needed.
  4. Check Charcoal Canister: Inspect the charcoal canister for leaks or damage. Replace if necessary.
  5. Clear Codes: After making repairs, clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0456 2004 Infiniti G35

The typical repair costs for addressing a P0456 code on a 2004 Infiniti G35 can range from $100 to $500, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check local rates for a more accurate estimate.

What does this mean?

Tech Notes for P0456 2004 Infiniti G35

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

When is the Code Detected?

Malfunction is detected when Evaporative Emission (EVAP) control system has a very small leak, EVAP control system does not operate properly.

Need more information about the P0456 2004 Infiniti G35 code?

Need more information on how to fix the P0456 2004 Infiniti G35 code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 Infiniti G35 Code

1. What does the OBDII code P0456 mean on a 2004 Infiniti G35?

P0456 indicates a "very small leak" in the EVAP (Evaporative Emission Control) system, which prevents fuel vapors from escaping into the atmosphere.

2. What are the common symptoms of a P0456 code on a 2004 Infiniti G35?

Symptoms may include an illuminated check engine light, a faint fuel smell near the vehicle, and possibly reduced fuel efficiency, though drivability is often unaffected.

3. What causes the P0456 code on a 2004 Infiniti G35?

Common causes include a loose or damaged gas cap, a cracked or leaking EVAP hose, a faulty purge valve, or a malfunctioning EVAP system component like the canister.

4. Can a loose gas cap trigger the P0456 code on a 2004 Infiniti G35?

Yes, a loose, damaged, or improperly sealed gas cap is one of the most common causes of a P0456 code.

5. How do I fix the P0456 code on a 2004 Infiniti G35?

Start by tightening or replacing the gas cap. If the code persists, inspect the EVAP system for leaks, damaged hoses, or faulty components and repair or replace them as needed.

6. How do I diagnose the P0456 code on a 2004 Infiniti G35?

Check the gas cap first. If it's secure, perform a smoke test to identify leaks in the EVAP system or use a diagnostic tool to test components like the purge valve and vent solenoid.

7. Is it safe to drive with a P0456 code on a 2004 Infiniti G35?

Yes, the code typically doesn't affect drivability, but it should be addressed to prevent possible emissions issues and ensure proper system function.

8. How much does it cost to repair a P0456 code on a 2004 Infiniti G35?

Costs vary depending on the issue. Replacing a gas cap may cost $20-$50, while repairing leaks or replacing EVAP components can range from $100 to $500 or more.

9. Will clearing the P0456 code fix the problem on a 2004 Infiniti G35?

Clearing the code won't fix the underlying issue. The cause of the small leak must be identified and repaired to prevent the code from returning.

10. Can extreme weather conditions cause a P0456 code on a 2004 Infiniti G35?

Yes, extreme temperatures can cause plastic or rubber EVAP components to crack or degrade, potentially triggering the code.

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