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Check Engine Light P0456 on my 2017 Durango - Small EVAP Leak?

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Melissa G. · rep 0 · May 22, 5:49 AM · 1 replies · solved · Question

Vehicle: 2017 Dodge Durango GT

Hey everyone,

I've got a check engine light on my 2017 Dodge Durango GT, and when I scanned it, I got a P0456 code: "Evaporative Emission System Leak Detected (Very Small Leak)". It's been on for a few days now, and I'm a bit worried about it. The car seems to be driving fine, no noticeable performance issues or strange smells.

I've already tried tightening my gas cap, and even replaced it with a new one, but the light is still on. What are some other common culprits for this code on a Durango of this year? I'm trying to figure out if this is something I can tackle myself or if I need to take it into a shop immediately.

Does this code typically lead to failing emissions inspections? Any advice on diagnosing this further or common parts that fail would be greatly appreciated. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:49 AM

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ClearTheCode admin answer:

The P0456 code, indicating a very small leak in the Evaporative Emission (EVAP) System, is a common issue across many vehicles, including your 2017 Dodge Durango GT. While it often doesn't cause immediate drivability problems, it's important to address it as it can lead to increased emissions and will prevent your vehicle from passing an emissions inspection.

Here's a breakdown of common causes and steps to diagnose:

Common Causes for P0456:

  1. Loose or Faulty Gas Cap: You've already addressed this, which is a great first step. Even a new cap can sometimes be faulty or not seal correctly.
  2. EVAP Purge Valve Failure: This valve controls the flow of fuel vapors from the charcoal canister to the engine. If it sticks open or closed, it can cause a leak.
  3. EVAP Vent Valve (Canister Vent Solenoid) Failure: Located near the charcoal canister, this valve opens to allow fresh air into the EVAP system during the purge cycle. If it's stuck open or doesn't seal properly, it can cause a leak.
  4. Cracked or Damaged EVAP Hoses: Over time, rubber hoses in the EVAP system can crack, become brittle, or disconnect, creating small leaks.
  5. Charcoal Canister Issues: The canister itself can sometimes crack or become damaged, leading to leaks.
  6. Fuel Tank or Filler Neck Leaks: Less common for a 'very small leak' code, but possible if there's a pinhole or crack.

When to See a Shop:

  • Persistent CEL after basic checks: If checking the gas cap and a visual inspection of accessible hoses doesn't resolve the issue.
  • No specialized tools: EVAP leaks are often diagnosed using a smoke machine, which injects smoke into the system to visually identify the leak point. This requires specialized equipment that most DIYers don't have.
  • Emissions Inspection Due: If your inspection is coming up, you'll need this resolved to pass.
  • Uncertainty: If you're uncomfortable performing diagnostics or repairs on the EVAP system, a professional technician can quickly pinpoint the problem.

What a Shop Will Do:

  1. Perform a smoke test: This is the most effective way to find small EVAP leaks.
  2. Check live data: They can monitor the purge and vent valve operation using a scan tool.
  3. Inspect components: Thoroughly check all EVAP lines, the charcoal canister, and associated valves for damage or improper connections.

While you can visually inspect hoses and listen for a clicking sound from the purge valve (which indicates it's cycling), a professional diagnosis with a smoke machine is usually the most efficient way to find a P0456 leak.

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