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2018 Pacifica Check Engine Light - P0456 Evap Leak Code

0

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

Hey everyone,

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: "Evaporative Emission System Leak Detected (Very Small Leak)".

The van seems to be driving fine, no noticeable changes in performance or fuel economy. 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.

Could this be something simple I'm missing, or is it likely a more involved repair? I'm hoping to avoid a trip to the dealership if it's something I can tackle myself. Any advice on common culprits for this code on a Pacifica would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

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

0

ClearTheCode guidance (Chrysler · Diagnostics & codes)

Summary: For 2018 Pacifica Check Engine Light - P0456 Evap Leak Code, work through these steps on your 2016+ vehicle:

  1. Confirm the symptom — note when it happens (cold start, highway, after fuel fill, etc.).
  2. Scan codes — save all pending/stored DTCs; don't clear until you've recorded them.
  3. Check TSBs & recalls — look up your VIN for open campaigns and known fixes.
  4. Inspect the obvious — related fuses, connectors, fluid level, and recent repairs.
  5. Test the common fix — follow model-specific service procedures; one change at a time.
  6. Escalate if needed — burning smell, no brakes, overheating, or stalling in traffic → shop visit.

Owner reported: Hey everyone,

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: "Evaporative Emission System Leak Detected (Very Small Leak)".

The van seems to be driving fine, no noticeable changes in performance or fuel economy. I've already checked the gas cap, tightened it, and even removed and re-seated it a couple…

This is educational guidance, not a substitute for hands-on diagnosis.

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