Engine-Codes - Nissan - P1456 NISSAN

P1456 NISSAN - Evaporative Emission Control System Leak Detected Small Leak

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

P1456 NISSAN Possible 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.

How is the P1456 NISSAN code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Tech Notes

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.

There is a factory Nissan service bulletin to help diagnose the P1456 code:
Nissan Factory Service Bulletin OBDII Code P1456

What is the cost to diagnose the P1456 NISSAN code

Labor: 1.0

The cost to diagnose the P1456 NISSAN code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
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When is the code detected?

The P1456 code is detected when the EVAP system has a very small leak.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible a noticeable fuel odor caused by the release of fuel vapors

P1456 NISSAN Meaning

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

More Information

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