P0455 on 2018-2021 Nissan KICKS: EVAP Gross Leak Causes and Fixes

What's Unique About the 2018-2021 Nissan KICKS

On modern Nissans like the Kicks, the EVAP system components, particularly the vent control valve, are known to be sensitive and a common failure point. While a loose gas cap is a universal cause, Nissans of this era are specifically mentioned in technical service bulletins 🎬 Watch: How to solve common Nissan EVAP leak codes fast. for EVAP leak codes. The vent control valve is located at the rear of the vehicle, mounted to the charcoal canister, where it is exposed to road grime, moisture, and debris that can cause it to stick open, creating the large leak detected by the P0455 code. Owners often find the fix is replacing this specific valve rather than chasing down cracked hoses.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Check Engine Light is on
• A noticeable smell of fuel, especially around the rear of the vehicle.
• A "Check Gas Cap" message on the dashboard (if equipped).
• Difficulty starting the engine immediately after refueling.

Most Likely Causes

1. Loose or Faulty Gas Cap 🔴 High Probability → Shop Fuel Tank Cap This is the most common cause for any vehicle, as it's easy to forget to tighten the cap properly after refueling. The cap's rubber seal can also degrade over time. Nissan's own TSBs list this as the first item to check.
   How to confirm: Remove the gas cap and inspect the rubber seal for cracks, dirt, or hardening. Reinstall it, ensuring you hear several clicks to confirm it's tight. Clear the code and drive. If the cap is old or suspect, an OEM replacement is recommended as aftermarket caps can have sealing issues.
   Typical fix: Tighten or replace the gas cap.
   Est. part cost: $15-$40
2. Faulty EVAP Canister Vent Control Valve 🔴 High Probability → Shop Vapor Canister Vent Valve This is a widely documented failure point on many modern Nissan models, including the Kicks and its platform mate, the Versa. The valve gets stuck open due to dirt, debris, or internal failure, creating a large, persistent leak. Its location at the rear of the car makes it vulnerable.
   How to confirm: The valve is located near the charcoal canister at the rear of the vehicle. A smoke test is the definitive way to confirm it's leaking. A mechanic can command the valve to open and close with a scan tool to test its function. A DIY method involves removing it (it's often a twist-lock design) and checking if you can blow air through it; when unpowered, it should be open, and when 12v is applied, it should close and not allow air to pass.
   Typical fix: Replace the EVAP canister vent control valve.
   Est. part cost: $50-$90
3. Faulty EVAP Canister Purge Valve 🟡 Medium Probability → Shop Vapor Canister This valve, located in the engine bay, can also stick open, causing a constant vacuum leak from the fuel tank into the intake manifold. While a common EVAP part to fail in general, on this platform it is less likely to be the cause of a P0455 🎬 Watch: How to replace the purge valve on this platform. than the vent valve.
   How to confirm: With the engine off, disconnect the hose from the purge valve that leads to the intake manifold and see if you can blow through the valve. It should be closed when the engine is off. You can also test its function with a scan tool or by applying voltage.
   Typical fix: Replace the purge valve.
   Est. part cost: $60-$150
4. Cracked or Disconnected EVAP Hose ⚪ Low Probability Hoses can become brittle and crack over time due to age and heat exposure, though it's less common on newer vehicles like the 2018-2021 Kicks.
   How to confirm: A visual inspection may reveal an obviously disconnected or cracked hose. However, small cracks are hard to see. A smoke test, where smoke is injected into the EVAP system, is the most effective way to find leaks in hoses.
   Typical fix: Replace the damaged section of hose.
   Est. part cost: $10-$50

Rare But Worth Checking

• Cracked EVAP (Charcoal) Canister: → Shop Vapor Canister The canister itself can develop a crack, often from road debris or physical damage. This is usually found during a smoke test if no other valve or hose leaks are present.
• Leaking Fuel Tank or Filler Neck: → Shop Fuel Tank Rust or physical damage can cause a leak in the fuel tank or the pipe leading to it, triggering a P0455 code. This is a more serious issue and usually presents with a strong fuel smell and may even be visible as a wet spot.
• Faulty Fuel Tank Pressure Sensor: → Shop Fuel Tank Rarely, the sensor that detects the pressure in the EVAP system can fail, giving the computer false information and leading it to believe there is a leak when there isn't one. This is typically diagnosed after a smoke test reveals no physical leaks.

Diagnosis Steps

1. Check the gas cap. Ensure it is tight and clicks several times. Inspect the seal for damage or debris. Clear the code. If the cap is suspect, replace it with an OEM part.
2. If the code returns, perform a thorough visual inspection of all accessible EVAP hoses and components under the hood and near the gas tank for obvious cracks or disconnections.
3. Locate the EVAP canister vent control valve at the rear of the vehicle, typically attached to the charcoal canister behind the rear wheel. Inspect it and its wiring for damage. This is a very common failure point.
4. Locate the EVAP purge valve in the engine bay and inspect it for damage.
5. The most effective diagnostic step is to perform a smoke test. A smoke machine forces smoke into the EVAP system. The leak will be visible wherever smoke escapes. This is the professional method recommended by Nissan's TSBs over a test drive.
6. If a valve is suspected, use a bi-directional scan tool to command the vent and purge valves to open and close, verifying their operation. This is part of the official diagnostic procedure.
7. Once the leak is found, replace the faulty component, clear the code, and perform a drive cycle to confirm the repair.

Parts You'll Likely Need

• EVAP Canister Vent Control Valve (OEM #14935-JF02C) — This is the most common failure part on modern Nissans for EVAP codes P0455, P0442, and P0456. It gets stuck open, creating a permanent leak. The part number has been superseded many times (from 14935-JF00A, etc.), indicating revisions to improve reliability.
  Trusted brands: Nissan Genuine, Dorman, Standard Motor Products
  OEM price range: $60-$90
  Aftermarket price range: $40-$70
• Gas Cap (OEM #17251-1NM0D (or superseding numbers)) — A worn out or improperly sealed gas cap is the simplest and most frequent cause of a P0455 code. Using an OEM cap is highly recommended as aftermarket versions can cause persistent issues.
  Trusted brands: Nissan Genuine, Stant
  OEM price range: $25-$40
  Aftermarket price range: $15-$25
• Vapor Canister Purge Valve (OEM #14930-3YM0A) — Located in the engine bay, this valve can stick open and is another common point of failure, though less so than the vent valve for a P0455 code.
  Trusted brands: Nissan Genuine, Bosch, Hitachi
  OEM price range: $150-$200
  Aftermarket price range: $50-$100

Related Codes That Often Appear With This One

• P0442 — This code indicates a 'small' EVAP leak. You might see this code alongside P0455 if the system has multiple leaks of different sizes, or if the computer's leak detection criteria overlap.
• P0456 — This code indicates a 'very small' EVAP leak. It's less common to see with P0455, but it points to the same system and could appear if a large leak (like a loose gas cap) is fixed, revealing a smaller, underlying leak.

Technical Service Bulletins (TSBs) & Recalls

• NTB13-097J: EVAP LEAK DTC P0442, P0455, P0456 INFORMATION
• NTB13-097g: ALL MODEL YEAR 2012 AND NEWER NISSAN VEHICLES; EVAP LEAK DTC P0442, P0455, P0456 INFORMATION

Platform-Specific Known Issues

• Nissan issued Technical Service Bulletin (TSB) #NTB13-097J, which covers all 2012 and newer Nissan vehicles (including the Kicks) for EVAP leak codes P0442, P0455, and P0456. [NTB13-097J] The TSB provides a specific diagnostic flowchart for dealers and explicitly states that 'A test drive is not part of the DTC confirmation or diagnostic procedures for these DTCs' and that 'Test driving the vehicle for these DTCs will only waste time'.

Mechanic-Grade Diagnostic Values

• EVAP Canister Vent Control Valve Solenoid Resistance — expected: 48 - 65 Ohms. Failure: A reading of 0 Ohms (short circuit) or infinite/OL (open circuit) indicates a failed coil.
• EVAP Canister Purge Valve Solenoid Resistance — expected: 30 - 38 Ohms. Failure: A reading significantly outside this range, or 0/OL, indicates a faulty solenoid coil.
• Fuel Tank Pressure (FTP) Sensor Voltage (Key On, Engine Off, Gas Cap Open) — expected: ~2.5V. Failure: Voltage stuck high (near 5V) or low (near 0V) regardless of gas cap removal, or does not change when vacuum is applied.

Scan Tool Commands That Help

• Nissan CONSULT or compatible bi-directional scanner: EVAP System Leak Check / Active Test — This function allows a technician to command the vent valve to close and the purge valve to seal the system, which is a required step before performing a smoke test or vacuum decay test to find a leak, as outlined in Nissan's TSB.

Wiring & Ground Locations

• EVAP Vent Control Valve Connector — At the EVAP vent control valve, which is mounted on or near the charcoal canister at the rear of the vehicle, typically behind the rear wheel.. This 2-pin connector provides power and the ECM ground signal to operate the valve. One pin should have 12V with the key on, and the other is the control. Corrosion or damage to this connector or its wiring can prevent the valve from closing, creating a large leak and triggering P0455.
• Fuel Tank Pressure (FTP) Sensor Connector — Typically mounted on the fuel tank or on the EVAP canister.. This is a 3-wire connector carrying a 5V reference, a ground, and the signal wire back to the ECM. A fault here can cause incorrect pressure readings, leading to a false P0455 code even if no leak exists.
• Body Ground — A wiring diagram for the 2018 Kicks shows a body ground connection for the EVAP control system. While the specific ground point (e.g., GXXX) isn't labeled in the diagram, tracing the ground wire (often black) from the EVAP system components is necessary if a wiring issue is suspected.. A poor ground connection for the EVAP system can cause erratic behavior of sensors and solenoids, potentially leading to incorrect diagnostics or failure of a valve to actuate properly.

Real Owner Repair Stories

• YouTube channel Mcgurr Entertainment (2009 Nissan Frontier XE (Uses similar EVAP components)) — Check Engine Light with code P0455.
  ❌ Tried (didn't work) Cleared the code, but it returned., Inspected the gas cap, which appeared to be in good condition., Performed a visual inspection of all EVAP hoses, finding no cracks., Conducted a DIY smoke test which did not reveal any visible leaks from the hoses.
  ✅ What actually fixed it The EVAP canister vent control valve was faulty. When removed and tested with a 12V source, the old valve did not click or actuate, while a new valve did. Replacing the vent control valve resolved the P0455 code.

"I Checked Everything" — The Actual Cause

• In a detailed diagnostic video on a Nissan with a P0455 code, a DIY smoke test was performed and revealed no visible leaks in the EVAP lines. The ultimate cause was a failed EVAP canister vent control valve that was not actuating electrically, meaning it was stuck open but the leak was not visible during the smoke test because the valve is normally open when unpowered.

OEM Part Supersession History

• 14935-JF00A, 14935-JF00B, 14935-JF00C, 14935-JF00D, 14935-JF00E, 14935-JF01B, 14935-JF01C → 14935-JF02C — This part has a long history of revisions, suggesting Nissan has made multiple updates to improve the reliability and sealing performance of the EVAP canister vent control valve.
  Heads up: While all listed parts are superseded by 14935-JF02C and should be physically compatible, it is always recommended to use the latest part number (14935-JF02C) to benefit from the most recent design improvements.