Technical Description
Malfunction in the Evaporative Emission Control System
What does that mean?
This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although it is a generic code, the specific repair steps may vary depending on the make and model of the vehicle.
This indicates that a component of the EVAP control system is not functioning correctly. The EVAP system is composed of various parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses.
The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle’s fuel system. Fuel vapors are directed through hoses to a charcoal canister for storage. Later, when the engine is running, a purge control valve opens, allowing intake vacuum to draw the fuel vapors into the engine.
Symptoms
You are unlikely to notice any drivability issues.
Causes
A code P0440 could indicate one or more of the following:
Possible Solutions
Diagnosing a P0440 OBD-II trouble code can be challenging at times. Here are some steps to try:
P0440 Repair Video
We are not affiliated with the producers of this diagnostic video, but we found it to be of excellent quality and worth sharing!
Other EVAP DTCs: P0441 – P0442 – P0443 – P0444 – P0445 – P0446 – P0447 – P0448 – P0449 – P0452 – P0453 – P0455 – P0456
