AutoCodes – Hyundai – P0440 Hyundai

P0440 Hyundai Code - Evaporative Emission Control System Malfunction

Quick Answer

Due to the increased ambient temperature of the fuel and the return of unused hot fuel from the engine, fuel vapors are generated in the tank. 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: P0440 Hyundai indicates Evaporative Emission Control System Malfunction.
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.

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Code Popularity 948

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 12, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0440 Hyundai Description

Due to the increased ambient temperature of the fuel and the return of unused hot fuel from the engine, fuel vapors are generated in the tank. In order to control the release of these vapors into the atmosphere, the evaporative emissions control system is used. The evaporative emission control system reduces hydrocarbon (HC) emissions by trapping fuel tank vapors until they can be burned in the combustion process. Evaporating fuel is stored in a charcoal canister until it can be flushed into the intake manifold. The evaporative emission control system is made up of a fuel tank that can be completely sealed from outside air, a Fuel Tank Pressure Sensor (FTPS), a Canister Close Valve (CCV) that seals the canister from the outside air, a canister filled with activated charcoal granules, a Purge Control Solenoid Valve (PCSV). The evaporative emission system can be checked for leaks by sealing the system off from the outside air, creating a vacuum, and monitoring if the system can hold that vacuum sufficiently for a set amount of time. If it cannot, a leak exists somewhere in the system. If there is a leak in the system, the Engine Control Module (ECM) is judged as a fault, and Diagnostic Trouble Code (DTC) is set.

OBDII Code P0440 Hyundai - Evaporative Emission Control System Malfunction - AutoCodes.com — P0440 Hyundai Code - Evaporative Emission Control System Malfunction

What does this mean?

What are the Possible Causes of the DTC P0440 Hyundai?

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
EVAP canister or fuel tank leaks
EVAP system hose leaking
Fuel tank leaking

How to Fix the DTC P0440 Hyundai?

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.

What does this mean?

Code Tech Notes

The P0440 code means that the control module has detected a leak in the Evaporative Emission (EVAP). Loose fuel tank filler cap is the most common cause that triggers the P0440 code.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0440 Hyundai 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.

Need more information about the P0440 Hyundai code?

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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 P0440 Hyundai Code

1. What are common symptoms of OBDII code P0440 in a Hyundai?

- Common symptoms include the illumination of the check engine light, a strong fuel odor near the vehicle, and potential issues during refueling.

2. What are the typical causes of OBDII code P0440 in a Hyundai?

- The code P0440 in a Hyundai is often caused by a loose or damaged gas cap, a faulty EVAP system purge valve, a leaking EVAP system hose, or a malfunctioning EVAP canister.

3. How can I diagnose the OBDII code P0440 in my Hyundai?

- To diagnose the code P0440, you can start by checking the gas cap for tightness and damage. Inspect the EVAP system components for leaks, test the purge valve for proper operation, and check the EVAP canister for any signs of damage.

4. Can I continue driving my Hyundai with the OBDII code P0440?

- While you may be able to drive your Hyundai with the code P0440, it is recommended to address the issue promptly to prevent potential damage to the emission control system and ensure optimal vehicle performance.

5. How can I repair the OBDII code P0440 in my Hyundai?

- Repairing the code P0440 in a Hyundai typically involves tightening or replacing the gas cap, repairing or replacing damaged EVAP system components, clearing the code with an OBDII scanner, and performing a drive cycle to ensure the issue is resolved.

6. Will resetting the check engine light resolve the OBDII code P0440 in my Hyundai?

- Resetting the check engine light may temporarily turn off the warning indicator, but it will not fix the underlying issue causing the code P0440. It is essential to diagnose and repair the problem to prevent it from recurring.

7. Are there any DIY tips for addressing the OBDII code P0440 in my Hyundai?

- DIY tips for addressing the code P0440 include checking and tightening the gas cap, inspecting the EVAP system components for visible damage, and testing the purge valve for proper functioning. However, more complex repairs may require professional assistance.

8. How much does it typically cost to repair the OBDII code P0440 in a Hyundai?

- The cost of repairing the code P0440 in a Hyundai can vary depending on the specific issue causing the malfunction. Simple fixes like replacing a gas cap can cost under $50, while more extensive repairs involving EVAP system components can range from $100 to $500 or more.

9. Can a dirty air filter cause the OBDII code P0440 in a Hyundai?

- While a dirty air filter does not directly cause the code P0440, it can impact the overall performance of the vehicle and potentially contribute to issues with the emission control system. It is advisable to maintain all engine components, including the air filter, to prevent related problems.

10. How often should I check the EVAP system in my Hyundai to prevent the OBDII code P0440?

- It is recommended to include a thorough inspection of the EVAP system during regular vehicle maintenance to prevent issues like the code P0440. Checking the gas cap, hoses, canister, and purge valve periodically can help identify and address potential problems early on.