What causes P0440 on a Hyundai Tucson?

Common causes of P0440 on Hyundai Tucson: Loose or damaged fuel cap (most common); Cracked EVAP canister; Failed EVAP purge solenoid valve; Leaking EVAP hose connections.

P0440

P0440 Hyundai Tucson

Q: How much does it cost to fix P0440 on a Hyundai Tucson?

Fixes for P0440 on Hyundai Tucson include: Inspect and tighten or replace fuel cap (Hyundai OE cap), Smoke test EVAP system to find leaks, Replace EVAP canister if cracked, Replace purge solenoid valve if stuck open or closed.

EVAP System Malfunction · Powertrain Code · Low · Repair: Easy

What is P0440?

General EVAP (evaporative emission control) system malfunction. The system that prevents fuel vapors from escaping has detected a fault.

When the Hyundai Tucson triggers code P0440 (evap system malfunction), it typically points to an issue in the powertrain system. Below you'll find the most common causes, symptoms, and repair options specific to the Hyundai Tucson.

This repair is rated easy, meaning basic tools, no lift needed.

Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Hyundai Tucson.

Common Causes on Hyundai Tucson

Loose or damaged fuel cap (most common)
Cracked EVAP canister
Failed EVAP purge solenoid valve
Leaking EVAP hose connections

Symptoms

Check Engine Light on
Fuel odor near vehicle
No driveability issues typically

Recommended Fixes

Inspect and tighten or replace fuel cap (Hyundai OE cap)

Smoke test EVAP system to find leaks

Replace EVAP canister if cracked

Replace purge solenoid valve if stuck open or closed

Notes for Hyundai Tucson

Start with the fuel cap; a loose cap is responsible for the majority of P0440 codes on Hyundai vehicles.

P0440 Hyundai Tucson

What is P0440?

Common Causes on Hyundai Tucson

Symptoms

Notes for Hyundai Tucson

Check Hyundai Tucson Specs