Engine-Codes.com
Engine-Codes – Infiniti – P1440 Infiniti

P1440 Infiniti Code - Evaporative Emission Control System Small Leak

Quick Answer

The P1440 code in Infiniti vehicles indicates a problem with the Evaporative Emission Control System, specifically a small leak. Common causes include Loose or Damaged Gas Cap: A loose or damaged gas cap can cause a small leak in the Evaporative Emission Control System, Faulty Purge Valve: The purge valve is responsible for controlling the flow of fuel vapors from the charcoal canister to the engine, A malfunctioning purge valve can lead to a small leak. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1440 Infiniti indicates Evaporative Emission Control System Small Leak.
Common causes
Common causes include Loose or Damaged Gas Cap: A loose or damaged gas cap can cause a small leak in the Evaporative Emission Control System, Faulty Purge Valve: The purge valve is responsible for controlling the flow of fuel vapors from the charcoal canister to the engine, A malfunctioning purge valve can lead to a small leak.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P1440 Infiniti Description

The P1440 code in Infiniti vehicles indicates a problem with the Evaporative Emission Control System, specifically a small leak. This system is responsible for capturing and storing fuel vapors from the fuel tank to prevent them from escaping into the atmosphere. A small leak in this system can lead to increased emissions, reduced fuel efficiency, and potential damage to other components of the vehicle.

OBDII Code P1440 Infiniti - Evaporative Emission Control System Small Leak
P1440 Infiniti Code - Evaporative Emission Control System Small Leak

Common Causes of P1440 Infiniti

  1. Loose or Damaged Gas Cap: A loose or damaged gas cap can cause a small leak in the Evaporative Emission Control System.
  2. Faulty Purge Valve: The purge valve is responsible for controlling the flow of fuel vapors from the charcoal canister to the engine. A malfunctioning purge valve can lead to a small leak.
  3. Cracked or Damaged Hoses: Over time, the hoses in the Evaporative Emission Control System can become cracked or damaged, causing a small leak.
  4. Faulty Fuel Tank Pressure Sensor: The fuel tank pressure sensor monitors the pressure in the fuel tank. If this sensor malfunctions, it can trigger the P1440 code.
  5. Charcoal Canister Issues: Problems with the charcoal canister, such as a clogged filter or damaged canister, can also lead to a small leak in the system.

Symptoms of P1440 Infiniti

  1. Check Engine Light: The most common symptom associated with the P1440 code is the illumination of the check engine light on the dashboard.
  2. Fuel Smell: A small leak in the Evaporative Emission Control System can sometimes result in a noticeable fuel smell inside or outside the vehicle.
  3. Reduced Fuel Efficiency: Since the system is not functioning properly, fuel vapors may be escaping, leading to decreased fuel efficiency.
  4. Rough Idle: In some cases, a small leak in the system can cause the engine to idle roughly or stall intermittently.

How to Fix P1440 Infiniti

  1. Diagnostic: Begin by using a diagnostic tool to read the P1440 code and identify the specific component causing the small leak.
  2. Inspect Components: Inspect the gas cap, purge valve, hoses, fuel tank pressure sensor, and charcoal canister for any signs of damage or leaks.
  3. Repair or Replace Components: Depending on the findings from the inspection, repair or replace the faulty component causing the small leak.
  4. Clear Codes: Once the repair is complete, clear the P1440 code from the vehicle's computer using the diagnostic tool.
  5. Test Drive: After completing the repair, take the vehicle for a test drive to ensure that the check engine light does not reappear and that the system is functioning properly.

Cost to Fix P1440 Infiniti

The cost of repairing a small leak in the Evaporative Emission Control System can vary depending on the specific component that needs to be repaired or replaced. On average, the cost of parts for this repair can range from $100 to $300, with labor costs adding an additional $100 to $200. Overall, the total cost of repairing the P1440 code in an Infiniti vehicle can range from $200 to $500. It's important to keep in mind that labor rates and parts prices can vary based on the location, vehicle make and model, and the specific repair shop. It's advisable to contact local auto repair shops for a more accurate cost estimate.

What does this mean?

Tech Notes for P1440 Infiniti

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 an Infiniti Service Bulletin to help diagnose the P1440 code:

Infiniti Factory Service Bulletin OBDII Code P1440

When is the Code Detected?

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

Need more information about the P1440 Infiniti code?

Need more information on how to fix the P1440 Infiniti code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1440 Infiniti code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1440 Infiniti Code

1. What are the common symptoms of an OBDII code P1440 in an Infiniti related to the Evaporative Emission Control System Small Leak?

- Common symptoms include the illumination of the check engine light, a noticeable fuel odor around the vehicle, and potential issues with the vehicle's emissions system.

2. What are the possible causes of an OBDII code P1440 in an Infiniti?

- The code P1440 in an Infiniti is often caused by a loose or damaged gas cap, a leak in the evaporative emission system, a faulty purge control valve, or a problem with the charcoal canister.

3. How can I diagnose the source of an Evaporative Emission Control System Small Leak in my Infiniti triggering the P1440 code?

- To diagnose the issue, you can start by checking the gas cap for proper sealing, inspecting the evaporative emission system components for visible damage or leaks, and using a smoke machine to identify the source of the leak.

4. Can a loose gas cap trigger the OBDII code P1440 in an Infiniti?

- Yes, a loose or improperly tightened gas cap can create a small leak in the evaporative emission control system, leading to the triggering of the P1440 trouble code.

5. What are some repair tips for addressing an OBDII code P1440 related to the Evaporative Emission Control System Small Leak in an Infiniti?

- Repair tips include ensuring the gas cap is tightened properly, inspecting and replacing damaged hoses or components in the evaporative emission system, testing and potentially replacing the purge control valve, and checking the charcoal canister for any issues.

6. Is it safe to continue driving an Infiniti with an OBDII code P1440 related to the Evaporative Emission Control System Small Leak?

- While the vehicle may still be operational with this code, it is important to address the issue promptly to prevent potential damage to the emissions system and ensure the vehicle meets regulatory standards.

7. How much does it typically cost to repair an OBDII code P1440 in an Infiniti caused by an Evaporative Emission Control System Small Leak?

- The cost of repairs can vary depending on the exact cause of the code, but it may range from around $100 for a simple fix like a gas cap replacement to several hundred dollars for more complex repairs involving components like the charcoal canister or purge valve.

8. Can I reset the OBDII code P1440 in my Infiniti after making repairs to the Evaporative Emission Control System?

- Yes, once the issue causing the code has been addressed, you can reset the code using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes to clear the stored error code.

9. How long does it typically take to repair an OBDII code P1440 related to the Evaporative Emission Control System Small Leak in an Infiniti?

- The repair time can vary depending on the specific cause of the issue and the complexity of the repair needed, but most repairs for this code can be completed within a few hours to a day at a qualified repair shop.

10. Are there any preventative maintenance steps I can take to avoid triggering the OBDII code P1440 in my Infiniti in the future?

- Regularly checking and properly tightening the gas cap, conducting routine inspections of the evaporative emission system components, and following the manufacturer's recommended maintenance schedule can help prevent the recurrence of the P1440 trouble code.

Discuss the causes and fixes for P1440 Infiniti OBDII Code

Submit a New Comment

Code P1440 Infiniti comments

No comments found for this page.