Question about 2005 Dodge Grand Caravan

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HI! The problem will definitely be on the PCM (powertrain control module). You will need to reset the PCM to get rid of the check engine light. Hope this helps and have a good one!

Posted on Aug 04, 2010

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P0443 - Evaporative Emission Control System Purge Control Valve Circuit

The Evaporative Emissions System (EVAP) allows fumes from the gas tank to enter the engine to be burned, rather than vented into the atmosphere as an emission. The purge valve solenoid is supplied switched battery voltage. The ECM controls the valve by operating the ground circuit, opening the purge valve at specific times allowing these gasses to enter the engine. The ECM monitors the ground circuit as well, watching for faults. When the purge solenoid isn't activated, the ECM should see a high voltage on the ground circuit. When the solenoid is activated, the ECM should see the ground voltage pulled low, close to zero. If the ECM doesn't see these expected voltages, or senses an open in the circuit, this code is set.

Potential Symptoms: P0443 trouble code symptoms could be just an malfunction indicator lamp (MIL) illumination. There may be no drivability problems at all. But, it's also possible to have a lean condition or a rough running engine if the purge valve is stuck open. Usually though, these symptoms are accompanied by other EVAP codes. Another symptom may be excessive pressure in the gas tank in the form of a "whooshing" sound when the cap is removed, indicating a purge valve that isn't working at all or stuck closed.

Causes: To cause a P0443, there has to be a problem with the purge control CIRCUIT, not necessarily the valve. Usually they are a unit housing the valve and the solenoid as an assembly. Or it could be comprised of a separate solenoid with vacuum lines to a purge valve. That said, it could be any of the following:
* Bad purge solenoid (internal short or open)
* Wiring harness chafing or rubbing another component causing short or open on control circuit
* Connector worn, broken or shorted due to water intrusion
* Driver circuit inside powertrain control module (PCM) is bad

Possible Solutions:
1. Using a scan tool, command the purge solenoid to activate. Listen or feel for a clicking coming from the purge solenoid. It should click once, or on some models it may click repeatedly.

2. If it doesn't click with scan tool activation, unplug the connector and examing the solenoid and connector for damage, water, etc. Then check for battery voltage on the feed wire with the key on. If you have battery voltage, then ground the control side manually using a jumper wire and see if the valve clicks. If it does, then you know the solenoid is working properly but there is a problem with the control circuit. If it doesn't click when you manually ground it, replace the purge solenoid.

3. To check for a problem on the control circuit (if the solenoid tests okay and you have voltage to the solenoid) plug the solenoid back in and remove the control circuit (ground) wire from the ECM connector (If you're unsure how to do this, do not attempt). With the ground wire removed from the ECM, turn the key on and then manually ground the Purge valve control wire. The solenoid should click. If it does, then you know there is no problem with the control wire to the solenoid and there is a problem with the ECM purge solenoid driver circuit in the ECM. You'll need a new ECM. However if it doesn't click, then there must be an open in the wiring between the ECM and and the solenoid. You must find it and repair it.

Finally, are you reset or delete all the stored codes in the PCM? Sometimes, when you dont make this delete operation, the stored codes just reminder the fault.

Tell us news.

Posted on Aug 04, 2010


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Posible causes

Bad or lose gas cap:

Also check the conections and hoses on the canister near the frame drivers side under hood and than see if the code returns, if you follow the small vac lines back you will also find a electric purge valve solenoid, there is a little vent on there you also need to check connections and vacuum lines.

If that don't do it replace the purge valve, note
gas cap can "look good" and still leak, if you did not actcually do a vacumm test on it you may just be spending good money on the wrong part.
In cases like these you cannot tell if something is faulty or not by looking at it, it must be tested. Try borrowing a cap from someone that is not having the problem, then reset your PCM and drive around for a half hour or so, if the code does not trip the MIL, THEN it is the cap. if the MIL does trip THEN it is the purge valve, only reliable way to "look at it"
Thank you for using fiya and good luck

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