Question about 2001 Dodge Durango
Evaporative Emission Control System Incorrect Purge Flow.
This indicates that a part of the EVAP control system is no longer functioning 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.
EVAP emission canister purge is controlled 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:
* 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
Here are a few solutions that should be followed to fix this issue.
* Common Chrysler 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 solenoid
* Repair resistance in purge connector
* Replace PCM
Please rate and god bless:)
Posted on Apr 15, 2009
P0441 evaporative Emission Control System Incorrect Purge Flow
The "EVAP purge flow" faults are issues between the carbon Cannister and the intake. The evap leak detection generally concerns the fuel tank to carbon Cannister plumbing. A little background. The evap or evaporative emission system is a control system to keep vapors from evaporation in the fuel tank from getting into the atmosphere. The fuel tank is not vented, but rather the vapors are piped to the carbon Cannister (usually located behind the pass. side front wheel) where the charcoal element absorbs the vapor. This is actually a vapor "storage" device. Under certain engine operating conditions, the ECU activates the Cannister Purge Valve (N80) which opens and allows the engine vacuum to **** the fuel vapors back out of the carbon Cannister. This purges the vapor, allowing the Cannister to absorb more vapor. This evap system has been on vehicles since the '70s. As part of the OBDII standard effective for 1996 cars and newer, it was mandated that leaks in the systems must be detected and reported as a fault which will set the Check Engine Light (CEL). To detect leaks, the system is pressurized by a pump so that leaks can be detected by a lack of appropriate pressure in the system. If there is a leak, such as a cracked vent hose, loose (or leaky) gas cap, poorly installed or defective O-rings on the fuel level senders on the fuel tank, etc. a code will be set. On the Cannister to intake side, leaks are detected by deviations in the idle control system. If you have leaks in the lines from the carbon Cannister to the intake, intake leaks, a defective purge valve, etc you will often get purge flow faults. My first recommendation is to closely inspect all the small vacuum lines connected to the intake manifold. The corrugated plastic lines are often the culprits, as well as the fabricate covered vacuum lines. Also consider replacing the gas cap.
Posted on Apr 14, 2009
Late post but I fixed it in my own truck so I'm posting this for others to view...First I thought fixing this issue on my own might be hard but it wasn't at all. U can see the code in Chrysler vehicles when you do the "key trick", ACC-On-ACC-On-Acc-On. Very good for home mechanics.
I have a 03 Durango and 54tml on the clock. I got this code every now and then, sometimes it took a year before it came back. The other day I got it again so I started to investigate. It's definitely not a leak (like gas cap), if so the code would say LEAK.
Monitor problem simply means that the computer cannot see whether the system is working OK or not.
I removed the NVLD switch which monitors the flow. I removed the top of the switch to get to the electricals inside of it. It looks very simple and I noticed 1 connector was corroded and there was no continuity with ohm meter. Well corrosion explains why it was intermittent. I cleaned the connector, put it back together and while sucking from the hose with my mouth I watched the ohm meter. Now it worked and about 0 resistance.
I didn't reset the computer, I let it clear on its own and watch how long it takes.
Now after driving about 60 miles some highway and mostly city and about a dozen starts the code cleared. I consider the problem fixed. It will probably come back after few winters when the contactor inside NVLD gets corroded again. But it's easy and quick to fix.
My cost was $0 and about 2hrs my own labor, next time it will be
much less time when I get to the right part immediately.
Posted on Sep 06, 2009
I had the same problem with the Evap code and I found out today that it was only the gas cap. I was getting both reading from a gas cap. I bought 2 gas caps from O'Riely and Autozone and neither one solved the problem because the caps were cheap. So, my mechanic got me one from Napa or the dealership, runs around $13-$23 and it solved the problem. The check engine light is off and to make sure, the mechanic drove my car for a while and I drove my car about 70 miles and the light did not come back on. Please do not waste your money on O'Riely and Autozone gas caps. Also be sure to replace the gas cap before doing any other major stuff. My car was a maze up until today.
Posted on Dec 31, 2009
Beleave it or not I changed my air filter and the light went off
Posted on Jun 04, 2009
Is it safe to drive my Ram 1500 when this code is activating check engine light?
Posted on Mar 01, 2013
I recently diagnosed p0441 evap incorrect purge flow for 2001 dodge ram 5.2L. I checked for leaks by slosing vent filter and smoke testing, found no smoke emission or leak in entire evap system or tank. next checked evap purge valve ability to hold vacuum on one hose port, it did with vacuum pump with key on engine off. then I grounded green/white (computer ground/ control wire) and vacuum dropeed showing opening of solenoid as expected. also scope tested duty cycle of computers ability to command purge solenoid on, it showed excellant square wave patern with aproximately 13 volts peak and aprox 100 mili volts grounding (no pcm transistor fault), ok so we know pcm is in control, especially with scanner showing duty cycle on PID (parameter identification database- scanner data) but why still a code? ok next i noticed at extended idle the computer begins to command purge valve on at 100% duty cycle or all the time but while this was occuring i noticed no vacuum being transmitted from intake manifold through purge valve first port to purge valve second port...a problem. for some reason the valve is not opening. I switched the hoses going to the purge valve ports and all of a sudden a vacuum was able to transmit through the valve and no vacuum when valve is commanded off, as it is supposed to.
Posted on Jul 20, 2011
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Posted on Jan 02, 2017
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