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2018 Charger R/T CEL - P0456 Small EVAP Leak?

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Kim L. · rep 0 · May 22, 5:49 AM · 1 replies · solved · Question

Vehicle: 2018 Dodge Charger R/T

Hey everyone,

My Check Engine Light (CEL) just came on in my 2018 Dodge Charger R/T, and I'm trying to figure out what's going on. I took it to AutoZone for a quick scan, and the code that came up is P0456, which indicates a "Small EVAP System Leak Detected."

I'm a bit worried about this. Is this a common issue for these Chargers? What are the usual culprits for a small EVAP leak? I've heard it could be something as simple as a gas cap, but I'm also concerned it might be something more serious or expensive to fix.

Has anyone else experienced this with their 2016-2026 Dodge Charger or similar model? Any advice on what I should check first before taking it to a shop? I want to make sure I'm not overlooking an easy fix.

✓ 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 small EVAP (Evaporative Emission Control System) leak, is indeed a common issue across many vehicle makes, including Dodge. It's designed to detect even tiny leaks in the system that prevents fuel vapors from escaping into the atmosphere. While it can sometimes be a simple fix, it's important to address it to ensure your vehicle passes emissions tests and operates efficiently.

Here are the common causes and steps you can take:

  1. Check the Gas Cap: This is the most frequent cause of a P0456 code. Ensure your gas cap is securely tightened, clicking at least 2-3 times. If it's old, cracked, or the rubber seal is worn, it might not be sealing properly. Replacing a faulty gas cap is an inexpensive first step.
  2. Inspect EVAP Hoses and Lines: Look for any visible cracks, disconnections, or damage to the vacuum hoses and lines that are part of the EVAP system. These can become brittle over time or get damaged by road debris.
  3. EVAP System Components: If the gas cap and hoses appear fine, the issue could stem from one of the EVAP system's components:
    • Purge Valve (or Solenoid): This valve controls the flow of fuel vapors from the charcoal canister to the engine. If it's stuck open or leaking, it can cause a P0456.
    • Vent Valve (or Solenoid): This valve opens to allow fresh air into the charcoal canister. A faulty vent valve can also lead to leaks.
    • Charcoal Canister: Less common, but the canister itself can develop cracks or damage.
    • Leak Detection Pump (LDP): Some Dodge models use an LDP to pressurize the system and detect leaks. A failing LDP can trigger this code.

When to See a Shop:

If checking and replacing the gas cap doesn't resolve the issue after a few drive cycles (the CEL might reset itself), it's best to consult a qualified mechanic. They have specialized smoke machines that can inject smoke into the EVAP system, making small leaks visible. This diagnostic process is crucial for accurately pinpointing the source of the leak, especially if it's a component like a purge valve, vent valve, or a hard-to-find hose crack. Ignoring the code won't typically cause immediate driveability issues, but it will prevent your vehicle from passing emissions inspections and indicates a system not functioning as designed.

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