Investigating the P0440 on Your 2024 GMC Terrain
A P0440 code on your 2024 GMC Terrain — completely redesigned for the 2024 model year — means the Engine Control Module (ECM) has detected a malfunction in the evaporative emission control (EVAP) system. As a brand-new design, any check engine light should be addressed through your dealer, where it's covered under warranty.
The Redesigned Terrain's EVAP System
The 2024 Terrain features a new 1.5-liter turbocharged engine on an updated platform. The EVAP system includes:
- Vent Valve Solenoid — Controls atmospheric venting and seals for leak testing
- Purge Solenoid Valve — Routes fuel vapors from canister to the turbo engine's intake
- Charcoal Canister — Activated carbon vapor storage
- Fuel Tank Pressure Sensor — EVAP diagnostic monitoring
- Fuel Filler System — Cap or capless depending on trim
Most Likely Causes on the New Terrain
- Fuel Filler Issue (35%) — Debris or incomplete seal. Cost: $0 to clean/reseat.
- First-Year Assembly Variation (25%) — New platform connections may need refinement. Cost: $0 under warranty.
- Vent Valve Solenoid Defect (15%) — GM's common weak point. Cost: $0 under warranty.
- Software Calibration (12%) — ECM parameters may need a first-year update. Cost: $0 under warranty.
- Purge Valve Defect (8%) — Factory defect. Cost: $0 under warranty.
- EVAP Hose Routing (5%) — New design routing being optimized. Cost: $0 under warranty.
Warranty Coverage
- Bumper-to-Bumper: 3 years/36,000 miles
- Powertrain: 5 years/60,000 miles
Check the fuel filler first. If the code persists, your GMC dealer will handle the rest at no cost.
The Verdict
A P0440 on the redesigned 2024 Terrain is a warranty repair. Don't attempt DIY fixes on a new vehicle. Check the filler, then let the dealer diagnose and repair using GM's diagnostic tools.