Question about 2004 Pontiac Grand Am

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I just had a scan done on my 2000 grand am 2.4 engine it had a code po442 where is this located on the car and I heard gas tank needs dropped to replace

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I heard gas tank needs dropped to replace ???? You should never listen to what you heard from someone who has no clue ! P0442 is a small leak DTC P0442 Evaporative Emission (EVAP) System Small Leak Detected. You really should take it to a qualified repair shop .

EVAP Leaks P0442 and P0455

The evaporative emission system is tested by applying vacuum to the EVAP system and monitoring for a vacuum decay. The PCM monitors the vacuum level through the fuel tank pressure sensor signal. At an appropriate time, the EVAP canister purge solenoid valve and the EVAP vent solenoid are turned on, allowing the engine to draw a small vacuum on the entire evaporative emission system. Once the desired vacuum level has been achieved, the EVAP canister purge solenoid valve turns off, sealing the system. A small leak in the system will cause DTC P0442 to set.

Wells EVAP Training with Sgt Tech P0440 P0441 P0442 etc

Posted on Apr 24, 2017


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Posted on Jan 02, 2017

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SOURCE: Troubleshooting code PO442 check engine light on

The code PO442 is a small leak somewhere in the evaporative emissions control system, the best way to find that is to take to a shop that does smoke tests for emissions.
As far as the nozzle, try changing the position of it the next time you get gas.

Posted on Nov 18, 2009

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SOURCE: location of oxygen sensors on 2002 dodge grand

The o2 sensors are located on the exhaust system.The upstream in on the rear exhaust manifold and the down stream is in front of the catalytic converter.Usually when they are bad they will make the check engine like go on.Make sure the air filter is clean,tires at correct inflation,alignment is to specs.If the vehicles pulls to one side or the other or steering wheel is not straight when driving down a straight stretch of road.Also tires are wearing normal.Use cruise control where ever on highway.If you let your vehicle warm up in winter.This also uses gas.Hope this helps.Good luck.

Posted on Dec 23, 2009

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SOURCE: need to replace fuel pump on a 1999 jaguar xj8.

Typically Jaguar fuel pumps are the submerged type (i.e. in the fuel tank) so you will need to remove the fuel tank or there might be a panel in the the tank that you can remove to get the the fuel pump. Good luck.

Posted on Sep 13, 2010

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SOURCE: 2000 grand am se abs light an trac off light and

If you had the car scanned with a generic OBDII code reader (Which is what they use at all the parts stores) this is probably why it is not showing any codes. You have "Vehicle Specific" codes. This means that the problem with your Check Engine light is not a problem that will generate a "generic" OBD code. A generic OBD code reader will not read codes from your Antilock Brake System or your Traction Control System at all... You need to have it scanned professionally by someone who has the proper equipment and software to access the Controller Area Network (CAN) in your vehicle.

Posted on Feb 25, 2011

SOURCE: Engine Light codes PO743, PO750,

Posted on Feb 26, 2011

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Po442 code for 2002 grand caravan

this relates to a slight leak of fuel vapour to atmosphere from the EVAP system , to check undo and refit gas tank cap and clear code , then drive for a day and rescan for code , if reappears then the EVAP system will need inspecting for leakage

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that is the evap sensor failure. it can be multiple things. gas cap allows it to come on sometimes. delete the cel and see if it comes back on. if it does it can be the evap sensor located on top of fuel tank, thereis a charcoal filter located in there somewhere that filters the gas fumes before it exits into the environment. with the work involved to drop the gas tank and everything, it is easier to replace all of it once you have it apart. that way you dont just change the sensor and put it all back together and it be something else.

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I doubt code 442 would affect the performance of the engine. Code 442 is for a small leak in the EVAP system. The computer vents the gas tank to the vapor canister when the engine is running. The computer has detected a small leak in the venting system, usually a faulty gas cap or leaking vent hose.

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Po442 is an evap leak, this is the fumes from the gas tank, check vacuum lines from engine compartment for any cracks or splits also make sure gas cap is tight and gasket is good, most of the time this is caused from a bad fuel cap, i would replace the gas cap make sure its on tight then drive for a week if the light goes out then problem solved if light is still on after a week of driving then there a leak is the system. hope this helps.

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Code po442 small leak (emmisions). How should i trouble shoot this problem? Could an exhaust leak cause this code to come up?

P0442:Evaporative Emission System Leak Detected (small leak)
what this system does is collect and store gas fumes, it also uses vacuum to detect any fuel tank or line leaks, it has zero to do with exhaust leaks, this code is often caused by a loose gas cap or a defective gas cap, so check the gas cap and make sure it is properly secured, if it is clear the code and see if it comes back, also never fuel the car with the engine running or the key turned on, this will trigger P0442.

Dec 06, 2009 | 2001 Pontiac Grand Am SE

1 Answer

Trouble code po442

P0442 onepx.gif EVAP System Small Leak (0.040") Detected

EVAP fuel tank or canister vapor hoses leaking or damaged
EVAP system component leaking, damaged or has failed
Fuel tank cap is loose, or the cap release pressure is incorrect
Leak detection pump damaged or leaking

You can try the gas cap first, if that does not help you will need to take it to a repair shop, Small leaks are very hard to find. If you want to know what turns on the light here it is.

Cold engine startup (ECT sensor from 40-90�F and within 10�F of the BTS input at startup), fuel level more than 1/2 full, engine running, EVAP leak test "on", and the PCM detected a leak greater than 0.040� but less than 0.080" somewhere in the system.
This code sets in 2 Trip(s).

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