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P1440 on 2015-2018 Ford Edge 2.7L: EVAP Purge Valve and Leak Causes & Fixes

On a 2015-2018 Ford Edge with the 2.7L EcoBoost, code P1440 almost always indicates a faulty EVAP canister purge valve or a leak in an EVAP hose. The purge valve is the most likely culprit, often getting stuck open. It is a relatively easy DIY replacement, with genuine Motorcraft parts costing between $40 and $85. This issue is common across many Ford models using this engine.

22 minutes to read 2015-2024 Ford Edge

Most Likely Cause

Faulty EVAP Canister Purge Valve

Est. Time

1.1 hrs

Shop Labor

$134 – $350

Parts Price

$40 – $160

⚠️ Drivable, but... — You can continue driving, but the issue can lead to a rough idle, difficulty starting after refueling, and reduced fuel economy. It will also cause a failed emissions test, so it should be addressed promptly to avoid potential long-term damage to catalytic converters from a rich fuel mixture.

Key Takeaways

P1440 on your 2.7L Edge most likely means the canister purge valve has failed or an EVAP hose is loose.
Before buying parts, remove the engine cover and physically check that all EVAP hose connectors are pushed in and locked.
Replacing the purge valve is a beginner-friendly DIY job that takes less than 30 minutes and can save hundreds in labor costs.
This code will cause an automatic failure on an emissions test, so it cannot be ignored if inspections are required in your area.

The Ford-specific definition for trouble code P1440 is 'EVAP System Vacuum Trouble'. This means the engine's computer (PCM) has detected a problem with the vacuum in the Evaporative Emission (EVAP) control system. The EVAP system's job is to capture fuel vapors from the gas tank and feed them into the engine to be burned, preventing them from polluting the atmosphere. This code indicates the system is unable to properly regulate or release vacuum, often because a component is stuck open when it should be closed.

What's Unique About the 2015-2018 Ford Edge

The 2.7L EcoBoost engine, like other modern direct-injection and turbocharged engines, has a complex vacuum and vapor management system. While P1440 is a general Ford EVAP code, the closely related code P144C is very common on this platform and is specifically addressed by Technical Service Bulletins (TSBs) that point to loose or improperly seated EVAP vapor line connections. TSB 19-2132, later superseded by TSB 21-2280 for newer models, explicitly instructs technicians to physically check the security of these quick-connect fittings before replacing parts, suggesting they are a known weak point from the factory. The 2.7L EcoBoost also has a check valve between the intake manifold and the canister purge valve to prevent boost pressure from entering the EVAP system.

Symptoms You May Notice

Check Engine Light (MIL) is on
Rough or unstable idle
Difficulty starting the engine, especially right after getting gas. This is due to an overly rich mixture from the raw fuel vapors being sucked into the intake.
A noticeable smell of fuel around the vehicle
Slightly increased fuel consumption
Extended engine cranking before it starts

⚠️ Don't Waste Money on the Wrong Fix

Replacing oxygen (O2) sensors. A faulty purge valve can cause rich or lean conditions that may trigger O2 sensor codes, but the root cause is the EVAP system, not the sensors themselves.
Replacing the fuel tank pressure (FTP) sensor. While an FTP sensor can fail, it is much less common than the purge valve or a simple hose leak. Always test the purge valve first.
Confusing the P1440 emissions code with the C1440 ABS code. On some Ford platforms, C1440 refers to a 'Pressure Difference Transducer Circuit Failure' in the ABS module and is completely unrelated.

Most Likely Causes

Faulty EVAP Canister Purge Valve 🔴 High Probability This is a very common failure item across many Ford models, including the Edge and its platform mates like the F-150 and Lincoln MKX. The valve's internal diaphragm fails, causing it to get stuck open and create a constant vacuum leak of fuel vapors into the engine.
How to confirm: With the engine off, disconnect the EVAP line from the purge valve that leads to the intake manifold. Use a hand vacuum pump to apply vacuum to the valve's inlet port. If it doesn't hold vacuum, it's stuck open and bad. Alternatively, with the engine running, disconnect the electrical connector; if you can still feel vacuum on the inlet port with your finger, the valve is stuck open. A properly functioning valve should be closed with the engine off.
Typical fix: Replace the canister purge valve assembly. It is located on top of the engine and is easily accessible after removing the plastic engine cover. The repair takes less than 15 minutes for most DIYers.
Est. part cost: $40-$85
Loose or Cracked EVAP Hoses/Lines 🟡 Medium Probability Ford has issued TSBs for the 2.7L engine (TSB 19-2132, TSB 21-2280) for the related code P144C, which point directly to EVAP vapor lines not being fully seated at their quick-connect fittings. The plastic connectors and rubber hoses can become brittle over time or may not have been properly installed at the factory.
How to confirm: Visually inspect all EVAP lines running from the charcoal canister (near the fuel tank) to the purge valve on the engine. Physically push and pull on each connector to ensure it is fully seated and locked, listening for an audible 'click'. A smoke test is the most effective professional method to find small, hard-to-see leaks.
Typical fix: Reseat any loose connectors until they click into place. Replace any cracked hoses or broken connector clips. The entire hose assembly may need to be replaced if the connectors are damaged.
Est. part cost: $10-$70
Issue with Capless Fuel Filler Neck ⚪ Low Probability The spring-loaded door on the capless system must create a perfect seal for the EVAP system to hold pressure. Debris, corrosion, or damage can prevent this, causing a leak that the system may interpret as an improper flow.
How to confirm: Inspect the fuel filler opening for any debris, dirt, or damage that could prevent the inner flap from sealing. Clean the opening carefully with a rag and solvent. The special funnel that comes with the vehicle can be used to open and close the flap to check its operation and help dislodge debris.
Typical fix: Clean the fuel filler neck opening. If the sealing flap is damaged or corroded, the entire fuel filler neck assembly must be replaced.
Est. part cost: $70-$150

Rare But Worth Checking

Failed EVAP Canister Vent Solenoid: This valve, located near the charcoal canister by the fuel tank, can get stuck closed, preventing the system from venting properly. It's less common than the purge valve failure for this code but is a core part of the EVAP system.
Damaged Wiring to EVAP Components: A short or open in the wiring to the purge valve or vent solenoid can prevent it from operating correctly, triggering a flow code. Check for corroded connectors or damaged wires, especially near the components themselves.
Failed Fuel Tank Pressure (FTP) Sensor: If the FTP sensor provides incorrect data to the PCM, the computer may believe there is a flow problem when there isn't one. This is less common than a mechanical failure of a valve or hose.

Diagnosis Steps

Read the code with an OBD-II scanner and check for any other related codes.
Inspect the capless fuel filler neck for debris or damage and ensure it seals properly.
Remove the plastic engine cover. Locate the EVAP canister purge valve on top of the engine.
Visually inspect the purge valve and its associated hoses and electrical connector for any obvious cracks, damage, or loose connections.
Physically push and pull on the EVAP hose connectors at the purge valve and where they connect to the intake to ensure they are fully seated, as per Ford TSB 19-2132. Listen for a 'click'.
Test the purge valve itself. With the engine off and electrical connector unplugged, it should be closed and hold vacuum. If you can blow through it or it fails a hand vacuum pump test, it is faulty and needs to be replaced.
If the purge valve tests good, use a capable scan tool to command the purge valve open and closed while monitoring the Fuel Tank Pressure (FTP) sensor to see if the system responds.
If the purge valve and its operation seem correct, the next step is a full EVAP system smoke test to find the source of the improper flow or leak.
If no leaks are found, inspect the wiring to the purge valve for power and ground, and check the operation of the canister vent solenoid near the fuel tank.

Parts You'll Likely Need

Vapor Canister Purge Valve (OEM #AU5Z-9C915-B) — This is the most frequent failure point for code P1440 on Ford vehicles. It gets stuck open, causing incorrect vapor flow. The part number has been superseded multiple times, with the latest version being AU5Z-9C915-E.
Trusted brands: Motorcraft (OEM), Dorman, Standard Motor Products, Wells
OEM price range: $60-$85
Aftermarket price range: $30-$55

Related Codes That Often Appear With This One

P144C — This code is for 'EVAP System Purge Check Valve Performance' and is very closely related. TSBs for the 2.7L engine specifically address this code, often pointing to the same loose hose connections.
P0456 — This code indicates a 'Small EVAP System Leak.' A stuck-open purge valve or a cracked hose that triggers P1440 can also be interpreted by the system as a small leak.
P2196 / P2198 — These codes mean 'O2 Sensor Signal Stuck Rich.' A stuck-open purge valve allows un-metered fuel vapors into the engine, which can cause a rich condition, leading the oxygen sensors to report this issue.
P1450 — This code means 'Unable to Bleed Up Fuel Tank Vacuum' and is another very common code caused by a stuck-open purge valve on Ford vehicles.

Technical Service Bulletins (TSBs) & Recalls

TSB 19-2132: Addresses illuminated MIL with DTC P04F0 and/or P144C on 2018-2019 Edge/F-150 with 2.7L/3.5L engines, advising to check for loose EVAP connections.
TSB 21-2280: Supersedes TSB 19-2132, updating the model years and engines affected by the loose EVAP connection issue causing P144C and P04F0.
TSB 23-2338: Addresses oil pan leaks on 2015-2017 Edge 2.7L models, recommending replacement with an updated pan design.
TSB 19-2387: Addresses oil pan leaks on 2018-2019 Edge 2.7L models.

Platform-Specific Known Issues

A Technical Service Bulletin (TSB 19-2132) exists for the 2018-2019 F-150 and other models with the 2.7L engine for code P144C, which instructs technicians to inspect for and re-secure loose EVAP vapor line connections. This TSB was later superseded by TSB 21-2280 which expanded the model years. This indicates a known issue with these connections on this platform and is highly relevant to diagnosing P1440.
The 2.7L EcoBoost in the Edge Sport/ST is known for its impressive performance but also for a well-documented oil pan leak from the factory RTV

Mechanic-Grade Diagnostic Values

EVAP Canister Purge Valve Solenoid Coil Resistance — expected: 15 - 50 Ohms. Failure: A reading of 0 Ohms indicates a short, while an infinite (OL) reading indicates an open circuit. Either requires replacement.
EVAP Purge Valve Supply Voltage (Key On, Engine Off) — expected: ~12V (Battery Voltage). Failure: Significantly lower or no voltage suggests a wiring issue, blown fuse, or problem with the power supply from the PCM.
Fuel Tank Pressure (FTP) Sensor Voltage (Key On, Engine Off, system at atmospheric pressure) — expected: ~2.6V. Failure: A voltage that is significantly different, or drops immediately upon starting the engine without the purge valve being commanded, points to a stuck-open purge valve or a leak between the valve and the sensor.
Short-Term Fuel Trim (STFT) during commanded purge — expected: Should go negative (e.g., -10% to -25%). Failure: If you command the purge valve open with a scan tool and the short-term fuel trims do not go negative, it indicates no fuel vapor is being drawn into the engine, suggesting a blockage or a non-functioning valve. Conversely, if trims are already very negative at idle with the valve commanded closed, it suggests the valve is stuck open.

Hidden / Shadow Codes Worth Checking

Mode 6, Test ID $81, Component ID $11: This is the non-continuous monitor for the EVAP system leak test. It tracks the pressure decay value during the test. A failing value here can precede a full-blown trouble code. (see via A scan tool capable of reading Mode 6 data, such as Forscan or a professional-grade scanner like Snap-on or Autel.)

Scan Tool Commands That Help

Ford IDS (or equivalent like Forscan): Powertrain > DataLogger > EVAP PIDs (FTP, CPV, CVV) — This is used to monitor the Fuel Tank Pressure (FTP) sensor voltage in real-time while commanding the Canister Purge Valve (CPV) and Canister Vent Valve (CVV) open and closed to verify their function. For P1440, you would command the CPV closed and watch if the FTP voltage remains stable; if it drops, the valve is leaking.
Ford IDS (or equivalent): EVAP System Test — This is an automated test that commands the vent and purge valves to seal the system, pull a vacuum, and monitor for leaks. It's a comprehensive check of the entire system's integrity. For P1440, if the system fails to pull a vacuum, it can point to a stuck-open purge valve.

Wiring & Ground Locations

G104 / G106 — G104 is often on the left front of the engine compartment, while G106 is on the right front.. These are main engine compartment ground points. A poor ground connection for a sensor's return circuit, including the FTP sensor, can cause incorrect voltage readings and lead the PCM to misinterpret the EVAP system's status.
Under-hood Fuse Box — Located on the driver's side of the engine bay, next to the battery.. This box contains fuses and relays that provide power to EVAP system components. A blown fuse for the purge valve or vent solenoid circuit would cause a loss of function and trigger codes.

Real Owner Repair Stories

Ford Edge Forum (2015 Ford Edge Sport 2.7L EcoBoost) — Check Engine Light with code P1450 (Unable to Bleed Up Fuel Tank Vacuum)
❌ Tried (didn't work) Initial diagnosis was uncertain.
✅ What actually fixed it The user referenced a similar issue on a Mustang with an EcoBoost engine where replacing the EVAP purge valve resolved the code. This is noted as a very common problem on Ford EcoBoost vehicles.

OEM Part Supersession History

AU5Z-9C915-A, AU5Z-9C915-B, AU5Z-9C915-C, AU5Z-9C915-D → AU5Z-9C915-E — Ford periodically updates parts to improve reliability and address known failure modes. These supersessions reflect design improvements to the purge valve.
Heads up: All previous versions are replaced by AU5Z-9C915-E, which is the current recommended OEM replacement and is fully compatible.

Diagnostic Flowchart

P1440 indicates an EVAP system 'Purge Valve Stuck Open' or 'Improper Purge Flow.' Start by checking for symptoms like hard starting after refueling, which is a hallmark of this platform's purge valve failure.

Remove the plastic engine cover. Disconnect the EVAP line and electrical connector from the purge valve. With the engine off, apply vacuum to the valve inlet. Does it hold vacuum?

→ The internal diaphragm has failed. Replace the EVAP Canister Purge Valve assembly (approx. $40-$85). This is a high-probability failure for the 2.7L EcoBoost 'Nano' engine.

Per TSB 19-2132 and 21-2280, check all EVAP vapor line quick-connect fittings. Do all connectors 'click' and stay locked when physically pulled?

→ Reseat the connector until it clicks. Ford TSBs indicate these lines often vibrate loose or were improperly seated at the factory on the Edge and F-150 platforms.

Inspect the capless fuel filler neck. Is there visible debris, corrosion, or a stuck spring-loaded flap?

→ Clean the filler neck with a rag and solvent using the emergency fuel funnel to cycle the flap. If the seal is damaged, replace the filler neck assembly.

Perform a professional EVAP smoke test. Does smoke emerge from the charcoal canister area or along the chassis lines?

→ Repair the specific leak point. If smoke exits the canister vent solenoid while commanded closed, replace the vent solenoid located near the fuel tank.

Use a scan tool to command the purge valve. Does the Fuel Tank Pressure (FTP) sensor show a change in vacuum during the command?

→ Check the wiring harness for power and ground. If the circuit is good but the valve doesn't click when commanded, the valve is electrically dead despite passing a vacuum test.

→ Clear the code and perform a drive cycle. If P1440 returns without physical symptoms, check for a faulty FTP sensor or an intermittent PCM software glitch requiring an update.