Sep 6, 2024 · The P0440 code means that the control module has detected a leak in the Evaporative Emission (EVAP). Loose fuel tank filler cap is the most common cause that triggers the P0440 code.

This guide explains the P0440 code’s meaning, symptoms, causes, and step-by-step diagnostics to fix it like a pro—potentially saving you $500-$1,200 from overpriced EVAP system overhauls. What Is a …

If you are unfamiliar with this complex system, you may be wondering, how do I fix trouble code P0440? Learn more about this important system, how to find the cause of the DTC and steps to take to fix the …

Information on diagnosing and fixing the trouble code P0440 EVAP system malfunction, with links to other articles on P0440.

Jun 5, 2024 · Find out what P0440 code means, its common causes, and the symptoms typically associated with this trouble code. Read on.

Feb 21, 2025 · Learn about the P0440 code, a sign of a large EVAP system leak. Discover its causes, symptoms, and how to diagnose and fix issues with the fuel tank, gas cap, hoses, and valves.

Apr 15, 2025 · Code P0440 indicates a malfunction in your vehicle’s Evaporative Emission Control (EVAP) system, specifically pointing to a large leak that allows fuel vapors to escape into the …

Aug 4, 2025 · Learn what the P0440 code means, common EVAP system problems that trigger it, and how to diagnose and fix the issue step-by-step.

Nov 24, 2025 · When P0440 sets, the ECU knows there’s a leak, blockage, or electrical issue somewhere in the EVAP system, but it cannot pinpoint which component failed. In this guide, you’ll …

Dec 1, 2024 · DTC P0440 signals an evaporative emission control (EVAP) system malfunction. A misaligned or defective gas cap is the most common cause, but a damaged EVAP line or charcoal …