P0456 2009 Nissan Altima Sedan 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 2009 Nissan Altima Sedan 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.
Code P0456 2009 Nissan Altima Sedan 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 2009 Nissan Altima Sedan?
- 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 2009 Nissan Altima Sedan?
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
All Nissan Models 2008 and newer Service Bulletin OBDII Code P0456:
All Nissan Models 2008 and newer Service Bulletin OBDII Code P0456
There is a factory Nissan service bulletin for the 2009 Nissan Altima Sedan:
2009 Nissan Altima Sedan Factory Service Bulletin OBDII Code P0456
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0456 2009 Nissan Altima Sedan 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 2009 Nissan Altima Sedan Code
1. What does the OBDII code P0456 mean on a 2009 Nissan Altima?
P0456 indicates a "Very Small Leak Detected" in the Evaporative Emission Control (EVAP) system, which prevents fuel vapors from escaping into the atmosphere.
2. What are the common symptoms of the P0456 code on a 2009 Nissan Altima?
The most common symptom is the illumination of the Check Engine Light. In most cases, there are no noticeable performance issues.
3. What causes the P0456 code to appear on a 2009 Nissan Altima?
The most common cause is a loose or faulty gas cap. Other causes include leaks in the EVAP system hoses, a damaged charcoal canister, or a malfunctioning vent or purge valve.
4. Can a loose gas cap trigger the P0456 code?
Yes, a loose or improperly sealed gas cap is one of the most frequent causes of the P0456 code.
5. How can I fix the P0456 code on my 2009 Nissan Altima?
Start by tightening or replacing the gas cap. If the code persists, inspect the EVAP system for leaks or have a mechanic perform a smoke test to locate the issue.
6. Is it safe to drive with the P0456 code on my 2009 Nissan Altima?
Yes, it’s generally safe to drive, as this code does not typically affect engine performance. However, it should be addressed to ensure your vehicle meets emissions standards.
7. How do I reset the P0456 code after repairs on my 2009 Nissan Altima?
You can reset the code by using an OBDII scanner or by disconnecting the battery for a few minutes. However, address the underlying issue first to prevent the code from returning.
8. How much does it cost to repair the P0456 code on a 2009 Nissan Altima?
Repair costs vary. Replacing a gas cap may cost $10-$30, while more extensive repairs, like fixing an EVAP leak, could cost $100-$500 or more depending on the issue.
9. Can extreme weather cause the P0456 code to appear?
Yes, extreme temperatures can cause seals or hoses in the EVAP system to expand or contract, potentially leading to small leaks.
10. How can I prevent the P0456 code from recurring on my 2009 Nissan Altima?
Ensure your gas cap is always tightened properly, and periodically check the EVAP system components for wear, such as cracks in hoses or damage to valves and seals.
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