P0456 Evaporative Emission Control System Leak Detected (Very Small Leak)

Powertrain Severity: Low Generic OBD-II

A very small leak was found in the EVAP system.

Common causes

  • Fuel cap seal
  • Tiny hose crack
  • Leaking valve

Symptoms

  • Check engine light

What to check

  1. Replace the fuel cap if worn
  2. Smoke-test the system

Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for P0456, follow the service information for that make and model.

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