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2018 Pacifica P0456 Code - Small EVAP Leak, Already Checked Gas Cap

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Amanda S. · rep 0 · May 22, 5:00 AM · 1 replies · solved · Question

Vehicle: 2018 Chrysler Pacifica Touring L

Hey everyone, I'm hoping someone can help me out. My 2018 Chrysler Pacifica Touring L just threw a Check Engine Light this morning. I hooked up my OBD-II scanner and it's showing a P0456 code, which indicates a very small EVAP leak.

The van seems to be driving completely fine, no noticeable performance issues, strange smells, or anything out of the ordinary. I've already checked the gas cap, made sure it's tight, 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, especially a 2016-2020 model? Is there a common culprit I should be looking for before I take it to a shop? Any advice on what to check next 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 signifies a very small leak in your vehicle's Evaporative Emission Control (EVAP) system. While it often doesn't affect driveability, it's crucial for environmental emissions and can prevent your 2018 Chrysler Pacifica from passing an inspection.

Here are the common areas to investigate for a P0456 code:

  1. Gas Cap Inspection: Double-check your gas cap. Ensure it's the original Chrysler cap and that it clicks at least 3-5 times when tightened. An old, worn, or aftermarket cap can sometimes fail to seal properly.
  2. Visual Hose Check: Carefully inspect all visible vacuum lines and EVAP hoses under the hood and around the fuel tank area. Look for any signs of cracks, disconnections, or damage. Pay particular attention to the lines connected to the purge valve and vent valve.
  3. EVAP Purge Valve: This valve, typically located near the engine, is a frequent failure point. It can stick open, creating a leak. You might sometimes hear a faint clicking sound from it when the engine is running, which is normal, but a constant open state is not.
  4. EVAP Vent Valve/Solenoid: Usually found near the charcoal canister (often close to the fuel tank), this valve seals the system during leak tests. If it fails to close completely, it can trigger a P0456.
  5. Charcoal Canister: Although less common, a damaged or cracked charcoal canister itself could be the source of the leak.

When to See a Shop: If you've thoroughly checked the gas cap and performed a visual inspection without finding the issue, it's highly recommended to take your 2018 Chrysler Pacifica to a qualified technician. They possess specialized diagnostic equipment, such as a smoke machine, which can inject a harmless smoke into the EVAP system. This makes even the smallest leaks visible, allowing for precise diagnosis and repair without unnecessary part replacement.

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