Error code · Engine

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

Safe to drive

Open this code in the appDownload the app

A fault code doesn’t yet mean the unit or sensor itself is faulty: often it’s the plug and connector leading to it.

Possible causes

What you can do yourself

  1. Check that the fuel cap is closed tightly and its seal is intact.
  2. Usually doesn’t affect how the car drives.

OA case from Oleg’s practice

  • Hyundai Tucson 2022 Check Engine and ABS, fuel smell on start-up; P04567A — very small EVAP leak. The purge valve worked, no major leak. Tip: replace the fuel cap first; if the code comes back — the purge valve. How it went ↗

The explanation comes from the error code reference in the AvtoElektrik PRO app.

Need a mechanic’s help?

Couldn’t fix it yourself? Oleg, an auto electrician, does computer diagnostics and repairs: he comes out anywhere in Almaty or sees you at his workshop.

EVAP system repair in AlmatyCall: +7 701 121 11 10

Want to figure it out yourself?

Oleg’s course “Car computer diagnostics with a scan tool”: how to hook up a scanner, read codes and live data, and use them to find the cause. The first lessons are free.

Scan tool diagnostics course →

Nearby codes

All codes in P04xx →

Who keeps this reference

The reference is kept by Oleg Dmitriev, an auto electrician from Almaty with 26 years of experience: computer diagnostics of cars and trucks, repair of control units (ECUs). Can’t find the cause? Message him.

Oleg’s auto electrician websiteWhatsApp +7 701 121 11 10