2019 Jeep Wrangler P0456 EVAP small leak

2019 Jeep Wrangler


  • 2.0L Turbocharged Inline-4
  • Horsepower: 270 hp
  • Torque: 295 lb-ft


  • 8-speed automatic

Fuel Economy:

  • City: Approximately 22 mpg
  • Highway: Approximately 24 mpg

Understanding and Resolving P0456 Code on a 2019 Jeep Wrangler with a 2.0L Engine

If you drive a 2019 Jeep Wrangler with the 2.0L engine, you might have encountered the dreaded P0456 code at some point. Don’t worry; this is a common issue in modern vehicles and is often related to the evaporative emission system. In this blog post, we’ll explain what the P0456 code means, its causes, and how to resolve it.

What is the P0456 Code?

The P0456 code is a diagnostic trouble code (DTC) that relates to the evaporative emission control system in your Jeep Wrangler. It specifically points to a small leak in the system. The evaporative emission system captures and stores fuel vapors from the gas tank to prevent their escape into the atmosphere.


Common Causes of the P0456 Code on the Jeep Wrangler

Several factors can trigger the P0456 code in your 2019 Jeep Wrangler with a 2.0L engine:

  • Loose Gas Cap: The most common reason for the P0456 code is a loose or improperly sealed gas cap. Before doing anything else, make sure your gas cap is tight and properly sealed.
  • Damaged Gas Cap: A damaged or worn gas cap seal can also lead to a small leak and trigger the code. If you notice any cracks or deterioration, consider replacing it.
  • Evaporative Emission System Leak: Beyond the gas cap, other components of the evaporative emission system may have leaks. This can include hoses, valves, and the charcoal canister.
  • Evaporative Emission System Purge Valve: A malfunctioning purge solenoid valve can lead to an insufficient vacuum within the system, causing the P0456 code to appear.
Purge Solenoid Valve

A vehicle’s purge solenoid valve is a component of the evaporative emissions control system, which is designed to reduce the release of harmful hydrocarbons (HC) and volatile organic compounds (VOCs) into the atmosphere.

  • Fuel Filler Neck: A damaged or corroded fuel filler neck can also lead to small leaks in the evaporative emission system.


  1. Malfunction Indicator Lamp (MIL) or Check Engine Light: The most common symptom of a P0456 code is the illumination of the Check Engine Light on your Jeep’s dashboard.
  2. Fuel Smell: In some cases, you might detect a slight gasoline smell, especially when refueling the vehicle.
  3. Decreased Fuel Efficiency: A small evaporative emission system leak can lead to decreased fuel efficiency as fuel vapors escape from the system, causing the engine to run less efficiently.
  4. Evaporative Emissions System Monitor Test Failures: A leak in the evaporative emissions system monitor tests may cause your vehicle to fail emissions tests or inspections.

How to Resolve the P0456 Code on the Jeep Wrangler

Now that you understand the potential causes, let’s discuss how to resolve the P0456 code on your 2019 Jeep Wrangler:

  1. Check the Gas Cap: First and foremost, ensure that the gas cap is properly tightened. If the cap is damaged, replace it with a new one.
  2. Inspect Hoses and Components: Examine the hoses, valves, and charcoal canister in the evaporative emission system for visible signs of damage, wear, or loose connections. Replace or repair any faulty components.
  3. Purge Valve Check: Test the evaporative emission system purge solenoid valve to ensure it’s functioning correctly. If it’s malfunctioning, consider replacing it.
  4. Fuel Filler Neck Inspection: Inspect the fuel filler neck for damage or corrosion. If any issues are found, replace the neck as necessary.
  5. Clear the Code: After addressing the issue, clear the P0456 code from the vehicle’s computer using an OBD-II scanner. This step ensures that the issue has been resolved.

Preventive Measures

To prevent the P0456 code from recurring, follow these tips:

  1. Always tighten the gas cap properly after refueling.
  2. Regularly inspect the gas cap seal for damage and replace it if necessary.
  3. Perform routine maintenance on the evaporative emission system to detect and address issues early.


Dealing with the P0456 code on your 2019 Jeep Wrangler with a 2.0L engine might seem daunting, but with proper diagnosis and some basic maintenance, you can resolve the issue and prevent it from returning. Remember to address the common causes we’ve discussed, and you’ll be back on the road with confidence in no time. If you’re unsure about any of the steps, consult your vehicle’s manual or seek the assistance of a professional Jeep mechanic to ensure a successful resolution.

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