OBD Code 0442 Means ... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

LBJ · 09-15-2019, 08:35 AM

2004 Silverado 5.3 V8.

... that your gas cap is not fully screwed down. Ha. Had a check engine warning light come on and read the code after I got home. "Evap System Leak (small)." Called my mechanic and he said it was likely the gas cap. I screwed it on tight and will see if the warning light comes on again. Almost a nuisance message. Maybe it has deeper meanings like the gas tank has to be sealed or something else will happen, more serious. I drove for almost one hour to get back home with the warning light and the truck ran fine. So, no big deal this time.

**hatzie** · 09-15-2019, 12:08 PM

0442 means the tank pressure either bled off too fast or showed vacuum or pressure and didn't change when the PCM ran an EVAP test.

I believe you have to erase the code once it lights the money lamp.

Loading the parts cannon is the expensive way to fix it.

The gas cap could be the problem or maybe not. Mine turned out to be the tank pressure sensor.
I went through the troubleshooting steps in my build thread.

09-15-2019, 08:35 AM	#1
LBJ Registered User Join Date: Jun 2007 Location: TEXAS Posts: 378	OBD Code 0442 Means ... 2004 Silverado 5.3 V8. ... that your gas cap is not fully screwed down. Ha. Had a check engine warning light come on and read the code after I got home. "Evap System Leak (small)." Called my mechanic and he said it was likely the gas cap. I screwed it on tight and will see if the warning light comes on again. Almost a nuisance message. Maybe it has deeper meanings like the gas tank has to be sealed or something else will happen, more serious. I drove for almost one hour to get back home with the warning light and the truck ran fine. So, no big deal this time.

09-15-2019, 12:08 PM	#2
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: OBD Code 0442 Means ... 0442 means the tank pressure either bled off too fast or showed vacuum or pressure and didn't change when the PCM ran an EVAP test. I believe you have to erase the code once it lights the money lamp. Loading the parts cannon is the expensive way to fix it. The gas cap could be the problem or maybe not. Mine turned out to be the tank pressure sensor. I went through the troubleshooting steps in my build thread. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.



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