Engine-Codes - Nissan - P1440 Nissan

P1440 Nissan Code - Evaporative Emission Control System Small Leak

- Code Popularity: 58,044 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
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What are the Possible Causes of the DTC P1440 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.
  • Fuel filler cap remains open or fails to close
  • Foreign matter caught in fuel filler cap
  • Incorrect fuel tank vacuum relief valve
  • Incorrect fuel filler cap used
  • Leak is in line between intake manifold and EVAP canister purge volume control solenoid valve
  • Foreign matter caught in EVAP canister vent control valve
  • EVAP canister or fuel tank leaks
  • EVAP purge line (pipe and rubber tube) leaks
  • EVAP purge line rubber tube bent
  • Blocked or bent rubber tube to EVAP control system pressure sensor
  • Loose or disconnected rubber tube
  • EVAP canister vent control valve and the circuit
  • O-ring of EVAP canister vent control valve is missing or damaged
  • EVAP canister is saturated with water
  • EVAP control system pressure sensor
  • Absolute pressure sensor

Code Tech Notes

The most common cause for the P1440 code is a loose or missing fuel filler cap. Resecure or install the cap and reset the engine light. In some cases, the light will turn off by itself after a few days of driving the vehicle. if the problem persists replaced the gas cap.

There is a factory Nissan service bulletin to help diagnose the P1440 code:
Nissan Factory Service Bulletin OBDII Code P1440

⚠ Does your Nissan have Safety Recalls? → Check here

How to Fix the DTC P1440 Nissan?

Check 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 pins.

Search for P1440 Nissan Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P1440 Nissan code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

When is the Code Detected?

When EVAP control system has a leak, EVAP control system does not operate properly

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Fuel smell

What Does the P1440 Nissan Code Mean?

This diagnosis detects leaks in the Evaporative Emission (EVAP) purge line using of vapor pressure in the fuel tank. The EVAP canister vent control valve is closed to shut the EVAP purge line. The vacuum cut valve bypass valve will then be opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP control system pressure sensor can now monitor the pressure inside the fuel tank. If pressure increases, the Engine Control Module (ECM) will check for leaks in the line between the vacuum cut valve and EVAP canister purge volume control solenoid valve.
P1440 Nissan Code - Evaporative Emission Control System Small Leak

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