P0440 on 2017-2022 Nissan Rogue Sport: EVAP System Malfunction Causes and Fixes

What's Unique About the 2017-2022 Nissan Rogue Sport

The 2017-2022 Nissan Rogue Sport uses a reliable 2.0L 4-cylinder engine (MR20DD). Unlike the newer Nissan Rogue models with the 1.5L VC-Turbo engine, the Rogue Sport is not involved in the major engine-related recalls from 2025-2026. For the P0440 code, there isn't a single, well-documented 'pattern failure' specific to the Rogue Sport. The causes are typical of many modern Nissan vehicles, requiring a systematic diagnosis rather than pointing to one specific known faulty part. However, the platform is known for other issues like CVT transmission problems and a recall for the folding ignition key.

Symptoms You May Notice

• Check Engine Light is on
• A faint smell of gasoline, especially around the rear of the vehicle or after refueling.

Most Likely Causes

1. Loose or Faulty Gas Cap 🔴 High Probability → Shop Fuel Tank Cap This is the most common cause for this code across all vehicles, as the cap's seal can degrade over time or it may not be tightened correctly after refueling.
   How to confirm: Ensure the gas cap is tightened until it clicks at least once. Inspect the cap's rubber O-ring or seal for cracks, stiffness, or damage. If it looks worn, it's suspect.
   Typical fix: First, try tightening the cap. If the code returns, replace the gas cap. It is highly recommended to use an OEM (Original Equipment Manufacturer) cap from Nissan, as some aftermarket caps do not seal correctly.
   Est. part cost: $15-$50
2. EVAP System Purge Valve Failure 🟡 Medium Probability → Shop Vapor Canister The purge valve is an electronic solenoid that opens and closes frequently, and can get stuck open or closed over its lifespan, causing a leak in the system.
   How to confirm: The purge valve is located on the top front side of the intake manifold, making it relatively easy to access. With the engine off, you can try to blow through it; if air passes, it is stuck open and faulty. A mechanic can also command it to open and close with a scan tool to check its function.
   Typical fix: Replace the EVAP purge valve solenoid. This involves removing two small bolts and disconnecting the electrical connector and two hoses.
   Est. part cost: $50-$150
3. EVAP Canister Vent Valve/Solenoid Failure 🟡 Medium Probability → Shop Vapor Canister Located under the vehicle near the charcoal canister, this valve is exposed to road debris and moisture, which can cause it to fail or stick. On the Rogue Sport, it is typically found at the rear of the vehicle on the passenger side.
   How to confirm: A mechanic can use a scan tool to command the valve to open and close, listening for an audible click. It can also be removed and tested with a 12V power source to see if the solenoid actuates. The valve can be removed by pressing a lock tab and rotating it off the canister.
   Typical fix: Replace the vent valve. On the Rogue Sport, the vent valve is often serviced separately from the canister, but sometimes they are replaced as an assembly.
   Est. part cost: $70-$200
4. Cracked or Disconnected EVAP Hoses ⚪ Low Probability Rubber hoses become brittle with age and exposure to heat and can develop small cracks, especially at connection points.
   How to confirm: A visual inspection may reveal obvious cracks, especially at connection points. The most effective method is a smoke test, where a machine fills the EVAP system with a harmless, visible smoke to reveal the exact location of any leaks.
   Typical fix: Replace the specific section of cracked hose.
   Est. part cost: $10-$40

Rare But Worth Checking

• Cracked Charcoal Canister: → Shop Vapor Canister The charcoal canister itself can develop a crack from road debris impact or age, creating a leak. This is usually found during a smoke test if no other cause is apparent.
• Faulty Fuel Tank Pressure Sensor: → Shop Fuel Tank The sensor that monitors the EVAP system's pressure can fail and send incorrect data to the ECM, tricking it into setting a P0440 code even if there is no leak.

Diagnosis Steps

1. Check the Gas Cap: Ensure it is tight and clicks. Inspect the seal for damage. If in doubt, replace it with an OEM cap (Part No. 17251-4BA0B), clear the code, and drive for a few days to see if it returns.
2. Visual Inspection: Look over all accessible EVAP hoses in the engine bay and under the vehicle for obvious cracks, disconnections, or damage.
3. Inspect the Purge Valve: Locate the purge valve on the engine's intake manifold. Check its electrical connector and hoses. Test for proper function if possible.
4. Inspect the Vent Valve: Locate the charcoal canister and vent valve assembly under the car, near the fuel tank on the passenger side. Check for damage or corrosion on the valve and its connector.
5. Perform a Smoke Test: If the cause is still not obvious, the most reliable diagnostic step is to have a smoke test performed. This will pressurize the system with smoke and make even the smallest leaks visible.
6. Component Testing: Based on the smoke test results, test the specific component (purge valve, vent valve, pressure sensor) indicated as the source of the leak or fault.

Parts You'll Likely Need

• Fuel Cap (OEM #17251-4BA0B) — This is the most frequent and simplest fix for a P0440 code. The seal fails over time. Using an OEM cap is strongly recommended.
  Trusted brands: Nissan (OEM)
  OEM price range: $25-$50
  Aftermarket price range: $15-$30
• Vapor Canister Purge Valve (OEM #14930-6FM0A (for 2019-22 models)) — This valve cycles frequently and can wear out, getting stuck open or closed.
  Trusted brands: Nissan (OEM), Bosch, Dorman, Hitachi
  OEM price range: $90-$150
  Aftermarket price range: $50-$100
• Vapor Canister / Charcoal Canister (OEM #14950-6MA0B (replaces 14950-6MA0A, for models up to 09/2018)) — The canister or its integrated vent valve can fail, causing a system leak. It is typically replaced if the vent valve is faulty and not sold separately, or if the canister body is cracked.
  Trusted brands: Nissan (OEM)
  OEM price range: $250-$450
  Aftermarket price range: $150-$300

Technical Service Bulletins (TSBs) & Recalls

• NTB21-034: Addresses an inoperative A/C on related Nissan models due to a stored DTC, which is relevant to the platform's known A/C issues.
• P9327 Service Campaign: A voluntary campaign to reprogram control units related to the Automatic Emergency Braking (AEB) system on 2017-2018 models.

Platform-Specific Known Issues

• Ignition Key Recall: A recall was issued for 2017-2022 Rogue Sports with a folding 'jackknife' key. The key could fold during operation, shutting off the engine and disabling safety systems. While unrelated to the P0440 code, it's a critical safety issue for owners to be aware of.

Mechanic-Grade Diagnostic Values

• EVAP Purge or Vent Valve Solenoid Coil Resistance — expected: 12 to 30 Ohms. Failure: A reading of infinity (open circuit) or near zero (short circuit) indicates a failed solenoid coil.
• Fuel Tank Pressure (FTP) Sensor Voltage — expected: With the sensor receiving a 5V reference from the ECM, the signal voltage should be around 3.0V-3.6V at atmospheric pressure (key on, engine off).. Failure: Voltage that is stuck high (near 5V) or low (near 0V) regardless of pressure, or does not change when a vacuum/pressure is applied during testing, indicates a faulty sensor.

Scan Tool Commands That Help

• Nissan CONSULT: Function Test / Active Test — This mode allows a technician to manually command specific EVAP components, like the purge valve or vent valve, to open or close. It is used to verify if the component is responding to ECM commands and to listen for the audible 'click' of the solenoid actuating.
• Nissan CONSULT: EVAP System Self-Test / Work Support — This initiates the vehicle's onboard EVAP leak detection monitor. It is used after a repair to confirm the fix is effective and that no other, smaller leaks are present that may have been masked by the original fault.

Wiring & Ground Locations

• EVAP Canister Vent Control Valve Location — Under the right rear of the vehicle, typically mounted on or near the charcoal canister assembly.. This valve is a common failure point. Knowing its location is critical for visual inspection of its wiring, testing, and replacement.
• EVAP System Fuse — In the engine compartment fuse box.. A fuse box diagram for a related 2018 Rogue indicates the 'EVAP Canister Purge Volume Control Solenoid Valve' is powered by a 20A fuse. A blown fuse would cause the component to be inoperative, leading to a fault code.

"I Checked Everything" — The Actual Cause

• In some cases, a P0440 code can be set even when a smoke test shows no leaks in the system. This often points to a non-leak failure, such as a faulty Fuel Tank Pressure (FTP) sensor. The sensor may be sending incorrect pressure readings to the ECM, tricking it into thinking there is a leak when the system is actually sealed. Diagnosis would involve testing the sensor's voltage output to see if it responds correctly to pressure and vacuum.

OEM Part Supersession History

• 14950-6MA0A → 14950-6MA0B — Standard part revision by the manufacturer.
  Heads up: The new part number 14950-6MA0B is specified for models built up to September 2018. Models built after this date may use a different canister assembly.

Model Year Variations Within This Range

• 2017 - early 2019 (up to 09/2018 build date): These models use the Vapor Canister assembly part number 14950-6MA0B (which replaced 14950-6MA0A).
• 2019 - 2022: These later models use a different Vapor Canister Purge Valve, part number 14930-6FM0A. This indicates a change in the EVAP system components around the 2019 model year.

Diagnostic Flowchart

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• CVT Transmission Problems 🔴 High — A widely reported issue across many Nissan models of this era, including the Rogue Sport. Symptoms include hesitation, jerking, shuddering, and premature failure. Problems were more prevalent in earlier models of the generation. (Ref: Nissan has issued multiple recalls and extended warranties for CVTs on various models over the years, though no single recall covers all vehicles.)
• Automatic Emergency Braking (AEB) Malfunction 🟠 Medium — Some owners report the AEB system activating unexpectedly when no collision is imminent. This has been a complaint across several Nissan models. (Ref: Nissan issued a voluntary service campaign (P9327) for some 2017-2018 Rogue Sport models to reprogram the control units related to this system.)
• A/C Compressor Failure 🟠 Medium — Reports of the A/C system blowing warm air are common, often traced back to a failed A/C compressor or its electrical control valve. This can be an expensive repair if out of warranty. (Ref: TSB NTB21-034 was issued for the related 2021 Rogue (and other models) for an inoperative A/C due to a stored DTC, sometimes requiring a software update or IPDM replacement.)
• Folding Ignition Key Failure 🔴 High — Affects models equipped with the 'jackknife' style key. The key can inadvertently fold while in the ignition, causing the engine to shut off while driving. (Ref: Nissan Recall Campaign for 2017-2022 Rogue Sport. Owners are advised not to use accessories on the key fob until a remedy (a spacer inserted into the key) is applied by a dealer.)

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: A used charcoal canister body can be a good value if it comes from a low-mileage, non-corrosion-region donor vehicle and is carefully inspected for cracks or damage. Hoses and brackets are also generally safe to source from a salvage yard.

Donor-vehicle mileage cap: roughly under 80000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• For a charcoal canister, check for any hairline cracks, especially around the mounting tabs and hose ports.
• Ensure all plastic hose connectors and lock tabs on the used part are intact and not brittle.
• Avoid parts from vehicles that show signs of significant underbody rust or impact damage near the rear axle.

OEM-only on this vehicle (don't cheap out):

• Fuel Cap: Aftermarket gas caps are a frequent cause of recurring P0440 codes on Nissan vehicles due to improper sealing. Always use a genuine Nissan OEM cap (17251-4BA0B) to ensure a correct fit and seal.

Aftermarket brands forum-validated for this vehicle:

• For sensors and valves, brands like Bosch, Hitachi, and Denso are often OEM suppliers and provide a reliable alternative to dealer parts.
• Dorman is a common aftermarket supplier, but quality can be inconsistent; check reviews for the specific part number.

Brands owners have reported issues with on this vehicle:

• Avoid unbranded, 'white-box' electronic parts (valves, sensors) from online marketplaces, as their calibration and durability are often poor and can cause persistent diagnostic issues.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P9327 — A voluntary service campaign code related to the Automatic Emergency Braking (AEB) system reprogramming on 2017-2018 Rogue Sport models.
• NTB21-034 — A technical service bulletin code associated with A/C compressor failure or electrical control valve issues that result in stored DTCs.

Frequently Asked Questions