Thread: Code P0440 - Evap Control

I topped my 2000 gtp out at 124 mph and the service engine light came on, I ran the code and it said "P0440 EVAP CONTROL SYSTEM MALFUNCTION" but the car isn't driving any different. What could it be?

Turn your gascap until it clicks a couple times.

Thanks for the quick reply but that isnt it

Evaporative Emission Control System Malfunction

What does that mean?This indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many 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 routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

Symptoms:
You likely won't notice any drivability problems.

Causes:
A code P0440 could mean one or more of the following has happened:
The gas cap is not installed or working properly
The purge solenoid has failed
The canister is plugged and not working properly

Possible Solutions:
With a P0440 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:
Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.
Inspect the EVAP system for cuts/holes in tubes/hoses
Inspect for damaged or disconnected hoses around the Evap purge solenoid
Check and/or replace the sensor
Check and/or replace the purge valve
Have a professional use a smoke machine to detect leaks



Source: OBD-II Trouble Code: P0440 Evaporative Emission Control System Malfunction

Had the same code last week. Replaced the purge solenoid, cleared my codes. Check codes today and nothing has returned and still no light. Part was only $20 from GM