Question about Cars & Trucks
04 chevy cavalier
All you can do is look at the mechanical parts that make up the system. I use a Modis scan-tool when digging into electrical issues. I will scan for codes, look at live data, test suspected components, perform repairs, and then reset the ECU (to clear the codes in its history) Did you clear the codes after you performed the repair? You may have found the problem or you may have just found something that it being affected by something else. P0442 refers to a small vacuum leak detected. Common failure is the gas cap. There are several other areas that need to be checked before parts should be replaced. Looking at what you have done so far. I believe that your car has a small hole in either an EVAP line, hose, fuel filler hose, fuel vapor hose, or fuel tank. You may save yourself time and money if you bring your car to the dealership and have them perform a "Smoke Test". If you don't know what that is, it is a test that sends smoke into the EVAP system. The technician fills the system up with smoke and looks to see where the smoke leaks out from. Without it, you will need to keep looking and check everything, carefully. I hope that helps, good luck.
Posted on Mar 10, 2014
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Posted on Jan 02, 2017
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Trouble Code: P0442
EVAP System Small Leak (0.040") Detected
Charcoal canister is loaded with fuel or moisture . Fuel filler cap is loose, cross-threaded, damaged or wrong part . Fuel tank, fuel filler neck or fuel sending unit 'O' ring is leaking. Fuel tank pressure sensor is damaged, disconnected or it failed. Fuel tank vapor line(s) is clogged, damaged or disconnected. Purge valve vapor line is clogged, damaged, or disconnected. Purge solenoid or Vent solenoid has a small leaking (sticking.) PCM has failed . TSB 01-06-04-007A contains a repair procedure for this code.
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