AutoCodes – KIA – P0440 KIA

P0440 KIA 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 KIA 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 1,059

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

What does this mean?

What are the Possible Causes of the DTC P0440 KIA?

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 KIA?

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 KIA 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 KIA 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 KIA Code

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

- Common symptoms include the illumination of the check engine light, a strong fuel odor, and possible problems during refueling.

2. What are the possible causes of OBDII code P0440 in a KIA?

- The code P0440 in a KIA typically indicates a malfunction in the evaporative emission control system, which could be caused by a loose or damaged gas cap, a faulty purge valve, a leak in the system, or a problem with the charcoal canister.

3. How can I diagnose the cause of OBDII code P0440 in my KIA?

- To diagnose OBDII code P0440 in your KIA, you can start by checking the gas cap for tightness and any visible damage. You may also need to inspect the purge valve, charcoal canister, and the entire evaporative emission control system for leaks or malfunctions.

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

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

5. How do I repair OBDII code P0440 in my KIA?

- Repairing OBDII code P0440 in your KIA may involve tightening or replacing the gas cap, replacing a faulty purge valve or charcoal canister, repairing any leaks in the system, and clearing the trouble code with an OBDII scanner.

6. Can a DIY enthusiast fix OBDII code P0440 in a KIA?

- Depending on your mechanical skills and access to tools, some individuals may be able to address OBDII code P0440 in a KIA themselves by following repair guides or tutorials. However, if unsure, it's recommended to seek professional help.

7. Will OBDII code P0440 cause my KIA to fail an emissions test?

- Yes, OBDII code P0440 typically indicates a problem with the evaporative emission control system, which can cause your KIA to fail an emissions test due to increased emissions and improper system functionality.

8. How much does it cost to repair OBDII code P0440 in a KIA?

- The cost to repair OBDII code P0440 in a KIA can vary depending on the specific cause of the issue, parts needed for replacement, and labor costs. It's advisable to obtain quotes from auto repair shops for an accurate estimate.

9. How long does it take to fix OBDII code P0440 in a KIA?

- The time needed to fix OBDII code P0440 in a KIA can vary based on the complexity of the issue, availability of parts, and the expertise of the mechanic. In general, the repair process may take a few hours to a day.

10. Can OBDII code P0440 reset on its own in a KIA?

- OBDII code P0440 may reset on its own if the underlying issue that triggered the code is temporary or self-corrects. However, it's recommended to diagnose and address the root cause of the code to prevent it from reoccurring.