Question about 2003 Oldsmobile Alero

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I have a 2000 Alero Oldsmobile, engine light is staying on it is a error code p0442, I replaced the gas cap and the canister, and the light is still coming on. Does anyone know what the problem could be?

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  • Master
  • 615 Answers

There may be and EVAP solenoid that is leaking. THe OLDS Aurora has this and it is a common failure with this code. Also, the evap lines run to the fuel pump on the top of the gas tank. Some cars have an access panel in the trunk under the carpeting, near the back seat on the right hand side.

Posted on Oct 03, 2009

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  • Ross Aubin
    Ross Aubin Mar 02, 2014

    replace the gas tank filler tube

  • Louis Alvarez
    Louis Alvarez Jul 30, 2016

    didnt know that , ill check it out.

  • Louis Alvarez
    Louis Alvarez Jul 30, 2016

    thanks much!

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  • Oldsmobile Master
  • 12,650 Answers

The computer is telling you that theirs a small leak in system usually it can be gas cap but also can be any component or line associated with the evap system some times not a simple fix may need to do a smoke test
http://www.obd-codes.com/p0442

Posted on Jul 30, 2016

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1 Answer

Have replaced 2 solenoids near engine, is there a 3rd underneath car?


There is a vent solenoid under the vehicle near the gas tank on the evaporator canister or charcoal canister An your replaced one near the engine you didn't need to. Only 1 on or near engine ( purge solenoid ) But there is also the possability the gas cap leaks , the fuel filler neck is rusted somewhere , or one of the hoses as a pin hole . You could replace all the solenoids an still have the code come back. The best way to trouble shoot these type problems is hook up a smoke machine an smoke the system . Your best bet would be to take your vehicle to a qualified repair shop. I mean unless you like spending money needlessly .
DTC P0442 Evaporative Emission (EVAP) System Small Leak Detected.To aid in locating intermittent leaks, use the J 41413 EVAP Pressure and Purge Station to pressurize the EVAP system. Move all EVAP components while testing with the J 41416 Ultrasonic Leak Detector.

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broken evap line/port on fuel pump. Or leaking fuel pump o-ring
check the EVAP canister it is right next to fuel filter could be pcm needs update to fix false codes. Here is a old hillbilly trick that may help put saliva on the seal of gas cap when you fill up every time that may work for you.

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1 Answer

P0442 evap small leak.were to look for it


The code P0442, "Small leak detected" means that the system is not sealed properly and has a small leak. The system prevents gasoline vapors inside the fuel tank from escaping into the atmosphere. Most common cause for this code is when the fuel tank cap is not sealing properly. Check the fuel tank cap, make sure it's tight. If you think that it wasn't closed properly, the check engine light should go off by itself in a few days of driving. If the check engine light won't go off, there could be a number of other reasons, such as leaking ventilation valve, cracked charcoal canister, cracked or pinched hose, leaking seal, etc.
If the leak is very small, it could be very hard to find. Take your car to a dealer or well-equipped garage that can test your system with the special equipment.

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2002 chevy calvair code po440 light stays on replaced gas cap vaccum valve on top of gas tank light still on


CHECK CHARCOAL CANISTER FOR FUEL AND MOISTURE.IF ALL IS GOOD YOUR PROBLEM COULD BE THE PURGE OR VENT SOLENOID POWER CIRCUIT IS OPEN.CHECK THE FUSE.IF FUSE IS GOOD THE GOOD.THE PURGE OR VENT SOLENOID COULD BE FAULTY.

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Service Engine light staying on


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.e. not factory/original brand); a small leak/hole in a fuel vapor hose/tube; other small leak in EVAP system; faulty vent o-ring seal

The EGR Valve is located on top of the intake manifold. If you are standing in front of the car it would be on your right hand side. It is cylinder in shape and has wire harness that connects to the back of the engine!

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2 Answers

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Code P0442 means Evaporative Emission Control System Leak Detected-(small leak). Most times that code is set if you removed the gas cap while the engine was running. If not, you could have a bad gas cap. It's minor in the grand scheme of things, but to be on the safe side, replace the gas cap, have the code cleared, and drive the car for a day or two. If the light stays off, problem solved.

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1 Answer

Getting the error code P0442 with a ODB2 on 2004 Caravan


Code 442 indicates a vapor leak in the EVAP control system. Fuel vapors are routed through hoses to the EVAP charcoal canister, then via purge control valve, are rerouted through intake when engine running. Bad gas cap seal is the usual culprit, which you can try cleaning the seal & filler neck where it screws in, then erase codes & try again & see if it comes back, or may require new gas cap. Other areas to look is at hoses running to & from canister & purge valve for any crack that may be a source of leak.

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1 Answer

Diagnostic code p0442


Hi, a P0442 is Evaporative Emission Control System Leak Detected (small leak). Start with the simplest thing first, make sure the gas cap is on tight. If it is, replace it with a new GM part (not a cheap aftermarket one). If that doesn't fix it, there are more steps listed here:
http://www.obd-codes.com/p0442

Jan 03, 2009 | 2003 Oldsmobile Alero

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