P0440

P0440 GMC Terrain

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 GMC Terrain 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 GMC Terrain.

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 GMC Terrain.

Common Causes on GMC Terrain

Symptoms

Recommended Fixes
Tighten or replace gas cap (check for cracked O-ring)
Replace EVAP vent solenoid (ACDelco 214-2317) — most common fix on GM trucks
Perform EVAP smoke test to locate leaks in the system
Replace EVAP purge solenoid (ACDelco 214-2149)
Inspect and replace cracked EVAP hoses

Notes for GMC Terrain

The EVAP vent solenoid on GM trucks is located near the charcoal canister under the vehicle — it is the single most common cause of EVAP codes on GM trucks.

Check GMC Terrain Specs

View oil type, torque specs, and maintenance info for the GMC Terrain.