AutoCodes – Volkswagen – P0440 Volkswagen

P0440 Volkswagen Code - EVAP Canister Purge Regulator Valve

Quick Answer

The Engine Control Module (ECM) tests the Evaporative Emission (EVAP) system for the following conditions: - Large and small leaks - Excess vacuum - Purge flow during non-commanded conditions - Fuel Level and Fuel Pressure sensor faults - EVAP Purge and Vent Valve faults The ECM monitors the Fuel Tank Pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. 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 Volkswagen indicates EVAP Canister Purge Regulator Valve.
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 25,578

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 Jun 14, 2020

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

The Engine Control Module (ECM) tests the Evaporative Emission (EVAP) system for the following conditions:
- Large and small leaks
- Excess vacuum
- Purge flow during non-commanded conditions
- Fuel Level and Fuel Pressure sensor faults
- EVAP Purge and Vent Valve faults
The ECM monitors the Fuel Tank Pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. The ECM commands both the EVAP Purge Solenoid and the EVAP Vent Valve ON when the conditions are met in order to apply an engine vacuum to the EVAP system. The ECM commands the EVAP Purge Solenoid OFF once the system has reached a predetermined level of vacuum. This test verifies if a vacuum can be achieved in the EVAP system. Failure to develop a vacuum may be caused by a large leak or a restriction.

OBDII Code P0440 Volkswagen - EVAP Canister Purge Regulator Valve - AutoCodes.com — P0440 Volkswagen Code - EVAP Canister Purge Regulator Valve

What does this mean?

What are the Possible Causes of the DTC P0440 Volkswagen?

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 Volkswagen?

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 Volkswagen 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.

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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 Volkswagen Code

1. What are common symptoms of an EVAP Canister Purge Regulator Valve issue (P0440) in a Volkswagen?

- Common symptoms include the illumination of the check engine light, rough idling, decreased fuel efficiency, and a gasoline odor near the vehicle.

2. What are the possible causes of the OBDII code P0440 related to the EVAP Canister Purge Regulator Valve in a Volkswagen?

- The code P0440 can be triggered by a faulty EVAP canister purge valve, a leaking or damaged EVAP system, loose or damaged gas cap, or issues with the EVAP vent valve.

3. How can I diagnose a P0440 code in my Volkswagen related to the EVAP Canister Purge Regulator Valve?

- Diagnosing a P0440 code typically involves using an OBDII scanner to retrieve the code, inspecting the EVAP system for leaks, testing the purge valve for proper operation, and checking the gas cap for proper sealing.

4. Can I drive my Volkswagen with an unresolved P0440 code related to the EVAP Canister Purge Regulator Valve?

- It is generally safe to drive your car with a P0440 code, but it is recommended to have the issue diagnosed and repaired as soon as possible to prevent potential damage to the vehicle's emission system.

5. How can I repair a P0440 code in my Volkswagen caused by the EVAP Canister Purge Regulator Valve?

- Repairing a P0440 code may involve replacing the EVAP canister purge valve, repairing any leaks in the EVAP system, ensuring the gas cap is properly sealed, or replacing the EVAP vent valve if necessary.

6. Are there DIY tips for fixing a P0440 code in a Volkswagen related to the EVAP Canister Purge Regulator Valve?

- While some basic diagnostic steps can be done at home, it is recommended to have a qualified mechanic perform the repairs for a P0440 code to ensure proper diagnosis and resolution.

7. How much does it cost to repair a P0440 code in a Volkswagen associated with the EVAP Canister Purge Regulator Valve?

- The cost of repairing a P0440 code can vary depending on the specific issue, but it may range from $100 to $500, including parts and labor.

8. Will resetting the check engine light resolve a P0440 code in a Volkswagen related to the EVAP Canister Purge Regulator Valve?

- Resetting the check engine light may temporarily turn it off, but if the underlying issue causing the P0440 code is not addressed, the light is likely to come back on.

9. How often does the EVAP Canister Purge Regulator Valve need to be replaced in a Volkswagen?

- The EVAP Canister Purge Regulator Valve typically does not need frequent replacement unless it becomes faulty or malfunctions, triggering the P0440 code.

10. Is a P0440 code associated with the EVAP Canister Purge Regulator Valve a common issue in Volkswagen vehicles?

- Yes, the P0440 code related to the EVAP Canister Purge Regulator Valve is a common emission-related issue found in Volkswagen vehicles, especially as they age.