What are the Possible Causes of the DTC P1456 Nissan?
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
Missing Fuel cap
Incorrect fuel filler cap used
Fuel filler cap remains open or fails to close
Foreign matter caught in fuel filler cap
Incorrect fuel tank vacuum relief valve
Leak is in line between intake manifold and EVAP canister purge volume control solenoid valve.
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How to Fix the DTC P1456 Nissan?
Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
Usually, loose or bad fuel tank filler cap will trigger these codes. Retighten fuel tank filler cap and clear the code to repair the problem. There are several Nissan service bulletins for this problem if tighten the gas cap does not repair the problem, check for Nissan Service bulletins for your model year.
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What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1456 Nissan code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.
When is the Code Detected?
The P1456 code is detected when the EVAP system has a very small leak.
What are Code Possible Symptoms?
Engine Light ON (or Service Engine Soon Warning Light)
A noticeable fuel odor may result from fuel vapor release
Code P1456 Nissan Description
This diagnosis detects leaks in the Evaporative Emission (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.
Most Nissan Models EVAP System Diagram
P1456 Nissan Code - Evaporative Emission Control System Leak Detected Small Leak
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