Jan 7, 2023 · What does the P0440 mean? The P0440 code indicates that there is a leak or malfunction in the EVAP emissions system. The EVAP system is a sealed gas vapor system that pulls the fuel …

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.

Jan 3, 2026 · The P0440 code indicates a malfunction in the evaporative emission control system, which captures and stores fuel vapours to prevent atmospheric release. A loose or damaged fuel tank filler …

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.

Code P0440 indicates a vapor leak somewhere in the fuel vapor system. These vapors can be very dangerous, detrimental to your health if inhaled, and extremely flammable.

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 …

Apr 15, 2025 · Code P0440 is a generic OBD-II diagnostic trouble code that stands for “Evaporative Emission Control System Malfunction (Large Leak).” This code is part of the P04XX series, which …