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2020 Pacifica CEL with P0456 - Small EVAP Leak Detected

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Sarah K. · rep 0 · May 22, 5:00 AM · 1 replies · solved · Question

Vehicle: 2020 Chrysler Pacifica Touring L

Hey everyone,

My 2020 Chrysler Pacifica Touring L just threw a Check Engine Light (CEL) yesterday. I hooked up my OBD-II scanner and it's showing a P0456 code, which indicates a 'Very Small Evaporative Emission System Leak Detected'.

The van seems to be driving fine, no noticeable performance issues or strange smells. I've already checked the gas cap, tightened it, and even removed and re-seated it a couple of times, but the light is still on.

Has anyone experienced this specific code on their Pacifica or other Chrysler vehicles? What are the common culprits for a P0456, and is there anything else I can check myself before taking it to the dealer? Any advice would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:00 AM

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ClearTheCode admin answer:

The P0456 code, 'Evaporative Emission System Leak Detected (Very Small Leak)', is a common diagnostic trouble code that indicates a minor leak in your vehicle's EVAP system. This system is designed to prevent fuel vapors from escaping into the atmosphere. While your 2020 Chrysler Pacifica Touring L may seem to drive normally, it's important to address this issue to maintain emissions compliance and prevent potential future problems.

Here are the common causes and steps you can take:

  1. Loose or Faulty Gas Cap: This is the most frequent cause. Even if you've tightened it, inspect the rubber seal on the cap for cracks or damage. A worn seal can prevent a proper seal. Consider replacing the gas cap with an OEM one if it looks suspicious.
  2. EVAP Hoses and Lines: Over time, rubber hoses in the EVAP system can crack, become brittle, or disconnect. Visually inspect all accessible vacuum lines and EVAP hoses under the hood and near the fuel tank for any signs of damage or disconnections.
  3. Purge Valve or Vent Valve: The EVAP system uses a purge valve (usually near the engine) and a vent valve (often near the charcoal canister, close to the fuel tank) to control vapor flow. A faulty purge or vent valve can cause a leak. While these are harder to diagnose without specialized tools, they are common failure points.
  4. Charcoal Canister: The charcoal canister stores fuel vapors. Damage to the canister itself or its seals can lead to a P0456.

When to See a Shop: If after checking and potentially replacing the gas cap, the Check Engine Light returns, or if you're uncomfortable inspecting the EVAP lines and components yourself, it's best to take your Pacifica to a qualified mechanic. They have specialized smoke machines that can inject smoke into the EVAP system to pinpoint even very small leaks that are impossible to find visually. Ignoring an EVAP leak can lead to failed emissions tests and, in some cases, can affect fuel economy over time.

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