Question about 2000 Dodge Durango
I think I can be of assistance. A Dodge engine light code P0442 indicates that a medium sized leak has been detected in the evaporative emissions system. Code P0455 indicates that a large leak has been detected. So basically the same concern is likely causing both check engine light codes. The evaporative emissions system is responsible for controlling fuel vapors, and metering them into the engine to be used in combustion and reduce overall vehicle emissions. The computer actually has a test that it performs on this system under certain conditions to make sure that there are no leaks, which would allow these vapors to vent to the air and pollute the environment. These conditions include cold start, engine running with fuel level greater than 12% and outside temperatures between 39 and 89 degrees Fahrenheit. When performing this test, the computer activates a Purge Solenoid to bring the system under vacuum. Once the NVLD (Natural Vacuum Leak Detection) switch is closed, indicating that a vacuum is obtained, the solenoid is turned off. If the vacuum level drops off, indicating that there is a leak in the system, the computer will set these codes. The rate of the leak determines which codes will be set. If you have replaced the gas cap then you can most likely eliminate that as the leak point. I would suggest taking a close look at the filler neck to make sure there are no cracks, and that there is a smooth surface for the gas cap gasket to seal against. A repair shop will hook a specialized smoke machine up to the evaporative emissions system and close the evap solenoid vent line. They will then fill the system with smoke and check with a spotlight for leaks. If no leaks are found it is possible that there is an issue with the purge solenoid. You can perform a quick mechanical leak check on this solenoid by disconnecting the vacuum lines from it and applying a 10 in Hg vacuum to the "can" side of the solenoid. It should hold vacuum. If not there may be an internal concern. Most often a leak in one of the lines or fittings is the cause of the problem and repair is fairly quick and inexpensive. You can do a visual on the lines yourself before bringing it to a shop. The EVAP leak detection pump, filter and purge solenoid can all be found together at the passenger's side front fender. The filter is the cylinder type device and the purge solenoid has the double vacuum fitting and electrical connector going to it. The pump should have a vacuum line on top and a couple of larger EVAP lines towards the front side as well. Check all lines at these components and follow them to their destinations, looking for signs ot wetness, leaks or cracks. Repair as needed. Use standard safety procedures and equipment. I hope you have found this information helpful. Let me know if I can be of any further assistance!
Posted on Jan 03, 2011
Tighten your fuel cap and be happy that it isn't a real problem! Actually, the fuel cap MIGHT be the only problem - replace with an OEM one. But, if that doesn't solve the problem you may want to seek a competent local mechanic to run a smoke test looking for leaks in the evap system. Could be anything from a crack in a vaccuum line to a faulty purge solenoid. My best guess would be the 90 degree elbow in the line connecting to the purge solenoid. A piece of heater hose should fix it.... but taking everything else you have listed here, I would hazzard a guess that you have a much more serious problem than a faulty gas cap.... try taking it to a good local mechanic and don't be surprised if he says something like a faulty computer. Sorry, but that is the best I can come up with, given that is all you have listed here.
Posted on Jan 03, 2011
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Posted on Jan 02, 2017
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