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P1440 on 2013-2018 Ford Focus ST: EVAP Vacuum Trouble, Causes, and Fixes

On a 2013-2018 Focus ST, code P1440 almost always means the canister purge valve has failed and is stuck open. This is a very common issue covered by Ford recall 18S32 and extended by Customer Satisfaction Program 24N07. Replacing the valve (Part No. BV6Z-9D289-E or newer revisions) is a simple DIY fix, with the OEM part costing around $50-$90.

22 minutes to read 2013-2018 Ford Focus ST

Most Likely Cause

Faulty Canister Purge Valve / Solenoid

Difficulty

1/5

Est. Time

0.6 hrs

DIY Doable?

✅ Yes

Shop Labor

$100 – $200

Parts Price

$50 – $90

⚠️ Drivable, but... — You can drive, but it's not recommended long-term. A stuck purge valve can cause engine stalling, rough idle, and may lead to fuel tank deformation, which can cause an inaccurate fuel gauge. Ford's official advice for recall 18S32 was for owners to keep the fuel tank at least halfway full until the repair could be performed to help prevent tank deformation.

Key Takeaways

Before buying any parts, check with a Ford dealer using your VIN to see if your Focus ST is covered by recall 18S32 or program 24N07 for a free repair.
P1440 on this car, especially when paired with P1450, is almost certainly a failed canister purge valve.
The most common symptom confirming the issue is the engine sputtering or having trouble starting right after you get gas.
This is a very easy DIY repair that takes less than 20 minutes with basic tools. Use the latest OEM part revision (e.g., BV6Z-9D289-F or -G) for best results.
Ignoring this code can lead to engine stalling and fuel tank damage, so it should be addressed promptly.

The trouble code P1440 is a Ford-specific code that means 'EVAP System Vacuum Trouble'. The Evaporative Emission (EVAP) system prevents gasoline vapors from escaping the fuel tank into the atmosphere. This code is set when the car's main computer, the Powertrain Control Module (PCM), detects a problem with the vacuum in this system, most often caused by a canister purge valve that is stuck open when it should be closed.

What's Unique About the 2013-2018 Ford Focus ST

The 2012-2018 Ford Focus platform, including the ST model, is uniquely susceptible to this issue. A stuck-open purge valve is so common that Ford issued a safety recall (18S32) and a customer satisfaction program (24N07). Unlike on many other cars, this failure can create excessive vacuum that physically deforms and collapses the plastic fuel tank, leading to severe secondary problems like inaccurate fuel gauge readings, erratic distance-to-empty calculations, and engine stalling.

Symptoms You May Notice

Check Engine Light is on
Difficulty starting the engine, sputtering, or stalling immediately after refueling
Rough or unstable idle
Fuel gauge reading incorrectly or erratically
Engine stalling during low-speed driving or when coming to a stop.
A 'whooshing' or 'sucking' sound from the rear of the car near the fuel tank as vacuum builds.

⚠️ Don't Waste Money on the Wrong Fix

Replacing the gas cap. While a bad gas cap can cause other EVAP codes, P1440 on this specific vehicle almost always points directly to the purge valve.
Replacing the fuel tank pressure sensor. This is unlikely to be the cause unless all other possibilities, especially the purge valve, have been ruled out. The recall documentation does not list this sensor as a primary failure point.

Most Likely Causes

Faulty Canister Purge Valve / Solenoid 🔴 High Probability This is a well-documented, widespread failure on this platform, leading to Ford issuing recall 18S32 and customer satisfaction program 24N07 for the 2.0L engine used in the ST. The valve's internal components fail, causing it to remain open.
How to confirm: Remove the purge valve. With the valve disconnected from power, try to blow through it from the side that connects to the EVAP canister towards the intake manifold port. If air passes through, the valve is stuck open and has failed. A properly functioning valve should be closed when not energized.
Typical fix: Replace the entire canister purge valve and hose assembly. It is highly recommended to use an OEM Motorcraft part for longevity. The original part number BV6Z-9D289-E has been superseded by newer revisions like BV6Z-9D289-F and BV6Z-9D289-G, which should be used if available.
Est. part cost: $50-$90

Rare But Worth Checking

Damaged EVAP hoses or lines: While the purge valve is the most likely culprit, visually inspect the connected plastic lines and rubber hoses for any cracks, brittleness, or loose connections that could cause a vacuum leak. The quick-connect fittings can sometimes become loose or damaged.
Saturated Charcoal Canister: Consistently overfilling the fuel tank ('topping off') can force liquid fuel into the charcoal canister, damaging it and causing flow problems that could trigger this code. Under recall 18S32, the dealer will inspect and replace the canister if the purge valve has failed and liquid fuel is present.

Diagnosis Steps

Check for Ford Safety Recall 18S32 or Customer Satisfaction Program 24N07. Your vehicle may be eligible for a free repair at a Ford dealership. Contact a dealer with your VIN to verify. Be aware that some dealers may charge a diagnostic fee if the code is caused by a different issue.
Scan for other related trouble codes, such as P1450, P144A, or P2196, which strongly suggest a purge valve failure.
Locate the canister purge valve. On the 2.0L EcoBoost, it is a black plastic valve and tube assembly located on top of the engine, under the decorative engine cover. The cover pulls straight off.
Visually inspect the valve and its connected hoses for any obvious cracks, damage, or loose fittings.
Perform a functional test: Disconnect the valve's electrical connector and remove the part from the engine. The connections are quick-disconnect style. Try to blow air through the port that connects to the intake manifold. If you can blow through it, the valve is stuck open and must be replaced.
If the valve is not stuck open, check the wiring harness and connector for damage, corrosion, or loose pins.
If the valve and wiring are good, the next step would be a smoke test of the EVAP system to check for leaks in other hoses or the charcoal canister, though this is a much less common cause for this code on this car.

Parts You'll Likely Need

Vapor Canister Purge Valve (OEM #BV6Z-9D289-E (superseded by BV6Z-9D289-F, BV6Z-9D289-G)) — This is the component that fails in over 95% of P1440 cases on this vehicle, causing it to stick open. It is recommended to use the latest available OEM revision.
Trusted brands: Motorcraft (OEM), Duralast (PV964), Standard Motor Products (CP902)
OEM price range: $50-$90
Aftermarket price range: $30-$60

Related Codes That Often Appear With This One

P1450 — This code for 'Unable to Bleed Up Fuel Tank Vacuum' is frequently seen with P1440 and is explicitly mentioned in Ford's recall 18S32 documents as being caused by the same faulty purge valve.
P144A — This is another Ford-specific code that points directly to a fault in the purge valve or its circuit, reinforcing the diagnosis.
P0455 / P0456 — These codes indicate a large or small EVAP leak. A purge valve stuck open can be interpreted by the system as a leak, sometimes triggering these codes as well.
P2196 — This code for 'O2 Sensor Signal Stuck Rich' can be triggered because the stuck-open purge valve allows un-metered fuel vapors to be constantly drawn into the intake manifold, creating a rich running condition. This code is also listed in the recall TSB.

Technical Service Bulletins (TSBs) & Recalls

Recall 18S32 / NHTSA 18V735: Fuel Tank Deformation due to stuck Canister Purge Valve.
Customer Satisfaction Program 24N07: Extends replacement of the canister purge valve for certain vehicles for 15 years/unlimited miles.
TSB 19-2171: Addresses other EVAP codes on similar engines, pointing to potential issues with loose EVAP line connections.

Platform-Specific Known Issues

Recall 18S32 / NHTSA 18V735: Fuel Tank Deformation: Ford issued this recall for 2012-2018 Focus models with 2.0L engines because a stuck canister purge valve can create excessive vacuum, deforming the fuel tank. This can cause stalling and an inaccurate fuel gauge, increasing crash risk. The dealer fix involves reprogramming the PCM to better detect the fault and, if codes are present, replacing the purge valve. If the fuel tank is found to be deformed by more than 25mm (1 inch), the tank, fuel delivery module, and charcoal canister are also replaced.
Customer Satisfaction Program 24N07: A follow-up program that provides a one-time, no-cost replacement of the canister purge valve for up to 15 years from the vehicle's warranty start date, with no mileage limit. This addresses vehicles that may experience the failure after the initial recall period.

Mechanic-Grade Diagnostic Values

Canister Purge Valve (CPV) Solenoid Resistance — expected: 30 to 38 Ohms. Failure: A reading far outside this range indicates a damaged internal circuit in the solenoid.
Fuel Tank Pressure (FTP) Sensor Voltage (Key On, Engine Off) — expected: Approximately 2.6V to 2.65V. Failure: If the voltage immediately drops when the vehicle is started, it can indicate a purge valve that is stuck open and already pulling vacuum on the tank.
Fuel Tank Pressure (FTP) during IDS EVAP Test — expected: Should drop below 2.6V as the purge valve is commanded open, and rise above 2.6V as the vent valve is closed.. Failure: If pressure goes excessively negative (e.g., below -8.0 in-H2O) and does not recover, it points to a stuck-open purge valve or a blocked vent.

Scan Tool Commands That Help

Ford IDS (or FORScan): EVAP System Test — This is a comprehensive, automated test that commands the purge and vent solenoids in sequence while monitoring the Fuel Tank Pressure (FTP) sensor. It's the most thorough way to verify the entire system's integrity, including its ability to seal, pull a vacuum, and vent, providing a clear pass/fail result.
Ford IDS (or FORScan): Datalogger > Bidirectional Control — This allows a technician to manually command the purge valve (Vapor Management Valve) and vent valve open or closed while watching the FTP sensor voltage in real-time. This is used to confirm if the valves are physically responding to PCM commands, isolating a failed component from a wiring issue.

Wiring & Ground Locations

G1 — Underneath the air cleaner assembly in the engine compartment.. This is a primary chassis ground. Poor contact here due to looseness or corrosion can cause a variety of electrical issues and sensor-related codes, including those for the EVAP system.
Purge Valve Connector — On the purge valve solenoid, located on top of the engine under the engine cover.. The two pins are for power and ground control from the PCM. Testing here can verify if the PCM is commanding the valve to open. One pin should have battery voltage with the key on, and the other is a duty-cycled ground provided by the PCM.
Main Chassis Ground — On the driver's side strut tower area, connected to the negative battery terminal cable.. This is the main grounding point for the entire vehicle chassis. Some owners have reported that cleaning the paint from under this connection to ensure a better metal-to-metal contact can resolve strange electrical issues.

Real Owner Repair Stories

Reddit user in r/FocusST (Ford Focus ST (year not specified), 70k miles) — EVAP code, likely P1440/P1450.
❌ Tried (didn't work) Replaced the original Motorcraft purge valve with a Duralast (aftermarket) part.
✅ What actually fixed it The Duralast part failed within 5,000 miles and nearly caused the gas tank to collapse. The user strongly advises that the only reliable fix is to use a genuine Ford Motorcraft replacement assembly, as aftermarket versions may use weaker internal check valves and materials that corrode or fail quickly.
Reddit user in r/FocusST (Ford Focus ST (year not specified)) — Multiple codes including P2196 (O2 Stuck Rich), P0131 (O2 Circuit Low), and white smoke from exhaust.
❌ Tried (didn't work) Replacing O2 sensors, MAP sensors, PCV valve, fuel injectors, spark plugs, cam position sensors, and VVT solenoids.
✅ What actually fixed it Another user commented that they had all the same codes when their purge valve failed, as it was causing the engine to suck in raw fuel vapors, creating the rich condition and smoke. The original poster's final outcome was a separate issue (low compression), but the symptom overlap strongly points to the purge valve as a primary suspect for this combination of codes.

"I Checked Everything" — The Actual Cause

A standard EVAP smoke test may show no leaks even when codes P1440 and P1450 are present. This is because the failure is typically not a leak to the atmosphere, which a smoke test is designed to find. Instead, the purge valve is stuck open, creating an internal leak from the EVAP system directly into the engine's intake manifold. The correct diagnostic procedure is to test the valve's function directly (the 'blow-through' test or using a scan tool's bidirectional controls), not to perform a smoke test.

OEM Part Supersession History

BV6Z-9D289-A, BV6Z-9D289-B, BV6Z-9D289-D → BV6Z-9D289-E (and later -F, -G revisions) — The original part design was prone to premature failure, causing it to stick open. Later revisions are intended to be more durable.
Heads up: While all revisions are physically interchangeable, it is critical to use the latest available Motorcraft OEM part. Forum users report that aftermarket versions (like Dorman or Duralast) can fail very quickly, sometimes within a few thousand miles, due to inferior internal components that cannot withstand the pressure or fuel vapor exposure.

Model Year Variations Within This Range

2013-2018: There are no significant documented changes to the EVAP purge valve assembly or its failure mode across the 2013-2018 ST model years, including the 2015 facelift. The same part numbers and recall/customer satisfaction programs apply to the entire generation.

Diagnostic Flowchart

Start by checking for active recalls and scanning for related EVAP codes. On the Focus ST 2.0L EcoBoost, P1440 often points to a purge valve failure that can lead to fuel tank deformation.

→ Contact a Ford dealer immediately. Under Recall 18S32 or Program 24N07, they may replace the purge valve and inspect the fuel tank for deformation at no cost.

Scan for additional OBD-II codes. Are codes P1450, P144A, or P2196 present alongside P1440?

Does the car struggle to start or stall immediately after refueling, or do you hear a 'whooshing' sound from the fuel tank area?

Remove the purge valve (located under the engine cover). With power disconnected, try to blow air through the port that connects to the intake manifold. Does air pass through?

→ The valve is stuck open. Replace the assembly with an updated OEM Motorcraft part (e.g., BV6Z-9D289-E or newer revisions like -F/-G).

Inspect the electrical connector and wiring harness for the purge valve. Is there corrosion, loose pins, or frayed wires?

→ Repair the wiring harness or replace the electrical connector to ensure the PCM can properly command the valve.

Inspect the fuel tank for signs of 'implosion' or deformation. Does the tank look sucked-in or misshapen?

→ The stuck valve created excessive vacuum. You must replace the fuel tank, fuel delivery module, and charcoal canister to ensure safety and fuel gauge accuracy.

→ Perform a professional EVAP smoke test to identify a small leak elsewhere in the system that may be triggering the P1440 code.

Inspect the EVAP line connections and the charcoal canister. Are there loose fittings or signs of physical damage?

→ Secure all EVAP line connections as per TSB 19-2171. Replace any cracked plastic lines or the charcoal canister if physically damaged.