receiving a check engine code p0441 "evaporative emission control system incorrect purge flow" message. Any ideas of what to check first or where the problem area is? Thanks.

 

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,carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's . Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the is running a purge control valve opens allowing vacuum to siphon the fuel vapors into the engine.

EVAP emission canister purge is contolled by a valve which allows engine vacuum to pull stored fuel vapors from fuel tank into the engine to be burned, rather than be vented to atmosphere. A vacuum switch is used to detect when flow exists. If the PCM commands purge and sees that the switch is closed (indicating no detected purge flow) P0441 is set.

A code P0441 could mean one or more of the following has happened:
Gas cap loose
Bad vacuum switch
Broken or damaged EVAP line or canister
Open in PCM purge command circuit
Open or short in Voltage feed circuit to Purge Solenoid Faulty purge solenoid Restriction in EVAP solenoid, line or canister Corrosion or resistance in purge connector
Bad PCM

Possible Solutions

With a P0441 OBD-II diagnosis can be tricky at times. Here are some things to try:

Common fix - Replace Leak Detection Pump / LDP
Repair damaged EVAP lines or canister
Repair open or short in voltage feed circuit to Purge Solenoid
Repair open in PCM purge command circuit
Replace purge Solenoid
Replace vacuum switch
Repair restriction in Evap line or canister or soleniod
Repair resistance in purge connector
Replace PCM

http://www.youtube.com/watch?v=Dfj-F_pTj5M

 

here's a simple test for whether its the gas cap or not. remove the gas cap and place it inside a thick quart size zip lock bag. put the cap sort of down in the corner and form the bag around the threads. reinstall the cap with the bag acting as a sealer/gasket. this completely seals off the check valve and the gasket. if you wish, reset the pcm and see if your code comes back in about 3 days. if not, this test proves it was the cap. if you don't feel like resetting the pcm, just wait 3 or 4 days and if the CEL goes out on its own, it was the cap.


Don't do this - spray silicon all over both sides of the check valve. this changes a p0441 (minor leak) into a p0445 (gross leak). LOL.

 

speaking from experience there man??

i would suggest checking all vacum lines, especially the ones under the hood near the heads they tent to dry out and crack

 

No your all wrong. you better listen to Sgt. Tech or hes gonna throw you in the brig kids.

 

nope im not wrong, no garantee that im right, but its a place to start looking,


btw, that video is actually pretty informative good find

 

I like the video.

 

To hydrashocker-Just installed a new 02sensor on the beast,was throwing a po135 for 5mts. $56 bucks, fifteen miles and that code is right back on there. zeekester any suggestions?

 

P0135 1/1 O2S Heater Failure

Unless you replaced it using a dealer O2, sensor the aftermarket suck. Then I would go to a tune up. But you should start a new thread.