P0456 2004 Infiniti G35 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 2004 Infiniti G35 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.
Code P0456 2004 Infiniti G35 Description
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.
What are the Possible Causes of the DTC P0456 2004 Infiniti G35?
- 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 Infiniti G35?
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.
Code Tech Notes
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 2004 Infiniti G35 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.
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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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