This is what your code means P0442 Evaporative Emission Control System Leak Detected small leak. My cousin had a good code reader, so we hooked it on that and found this code, cleared it, then about 30 miles later the light came back on. It seems like the valve should be shut unless it has power and the computer tells it to open? A leaking purge valve is a common cause of the code P0422 in some Mercedes, Hyundai, Nissan, Ford and Mazda vehicles. But there are some things to remember. The fuel cap sealing surface on the filler neck needs to be inspected for corrosion. Without testing equipment, diagnosing the code P0442 is difficult.
I've been looking all over the truck for a broken line or leak that is obvious, but have had no luck. Thye check engine light could be from a bad O2 sensor to just a bad or loose gas cap to a transmission issues. Gotta love how easy these trucks are to work on! I'm having the exact same problem, did you find a solution? Then it closes the purge valve and watches the fuel tank pressure sensor to see if the correct vacuum level was achieved. It retains this information in memory until it conducts the test a second time. So I guess I have three questions. If you don't have one, you can go to your local auto parts store and have them reset it for you. Do you think I need to re run the vent hose on top of the tranny? I have a 2006 Z71 5.
Not to worry there's a quick and easy and inexpensive fix. In some Mazda 5 minivans, the code P0442 could be caused by a leaking vent valve. It can be inspected with a vacuum pump. Reinstall U lock and new cover gasket. Just figured I post here on the forum to see if anyone had any other ideas before bring the truck to the dealership. I'm hoping to get some help with a recent trouble code that my computer system threw out.
I called the dealer and they told me to replace the gas cap and this will solve my problem. It can also be tested separately. Causes: A code P0442 most likely means one or more of the following has happened: A loose or improperly affixed gas cap A non-conforming gas cap i. If the O-ring on the gas cap is worn, distorted, or missing, that would also be a large leak. Most of the time that will fix the problem. I thought that since the cap didn't clear the code that wasn't the issue.
I keep getting this code. Posted on Aug 10, 2010 The P0442 code is for a small leak in the pressurized emission system. When certain driving conditions are met, the engine sucks the gas vapors out of the canister and allows fresh air in to completely purge the charcoal. I know a guy that has the device that can test gas caps. I have a 2006 Z71 5. Sounds complex but it's not.
I have the same code and it will barley take any fuel when I fill it up. Then my engine light came on and got these 3 codes P0455,P0442,P0449. Guess what it cleared up for a day. I heard that there was a kit you can buy and this should solve the problem. Remove bearing seal then bearing.
I checked the lines and the purge valve. I put it in on. Truck only had 36k miles. The evaporative system includes the following components: The fuel tank. It is worth changing both of them becauses if one fails the other is not far behind.
Shops use a special low pressure smoke machine with nitrogen to pressurize the system and find leaks. Symptoms: With this code there might be no symptoms other than the Check Engine light. I keep getting this code. First, it cannot handle high pressure. They did a smoke test on the Evap system and found that the sending unit on the top of my fuel tank was rotted away most likely from a mix of road salt and a hard area to clean.
In some cars, the warning about fuel cap being loose may also appear on the dash. Just resetting the light is a waste of time. I just went to RockAuto. Ended up taking it to the dealer. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine. It can also be caused by dirt or spider webs blocking the complete sealing of the purge or vent solenoids.