Question about 2004 Hyundai Elantra

1 Answer

Check engine light went on Monday evening when I started my 2004 Hyundai Elantra. I shut it off and tightened the gas cap. That didn't work. It is still on as of Tuesday afternoon.

Posted by ilrar33 on

Ad

1 Answer

Marvin

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

  • Hyundai Master
  • 85,239 Answers

The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause.

When the Check Engine light (or Service Engine Soon) is turned on, the systems computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible system faults (the gas cap is just one of them) that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen/Oriley and Autozone parts stores (USA only) do this testing for free.

Posted on Aug 23, 2011

Ad

Add Your Answer

×

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Help 2003 hyundai


You had a starter replaced,paid for that,
even though nothing works,not even
the new starter?
Where did you go for that work?
AAA- didn't know they diagnose vehicles
& give advice,you been had by two parties

Jul 26, 2013 | Hyundai Motor 2003 Elantra

1 Answer

My 2004 Hyundai Elantra surges and jumps gears


You got ripped off by the mechanic. A good mechanic can pinpoint the problem by using a scan tool. Take vehicle to autozone or similar and have it scanned for codes this will give you a idea what is wrong. I believe the problem is exhaust related because of the blinking light.

May 29, 2017 | 2004 Hyundai Elantra

1 Answer

My 2003 hyundai elantra's check engine light is on.


most of the time a engine light will set with an Evap leak code if the gass cap is not tight or left off. tighten cap, or replace cap if gasket is cracked or worn.

Mar 06, 2012 | Hyundai Motor 2003 Elantra

1 Answer

I have a 2004 Yukon denali and while driving, I got check gas cap alarm. 2 miles later check engine light is on. Checked gas cap, cleaned gasket and tightened. Drove for 2 days. Reset fault and drove 160...


Hello, have you tried to unhook the negative side of the battery for about 10 minutes and then go from there . It should reset the computer completely .

Sep 14, 2011 | 2003 GMC Yukon Denali

1 Answer

I have a 2001 hyundai elantra with a p0440 code.I replaced the PCV valve & hose,cleaned/tightened gas cap,tested manifold vacuum[is good],replaced rear charcoal cannister & pressure sensor...


Sounds like you have done a lot of the right work here. I popped that code on my 2001 Elantra within the first 50k miles. Turns out that in my case the gas cap was the culprit. Keep reading though, maybe this still applies. My cap was still very new, and it's not that I forgot to put it on or to tighten it. The mechanic at the Hyundai dealership said this happened all the time to this car, and that you simply have to get the cap tighter. It has that ratcheting release so as to not over-tighten it, but here's the trick: Tighten as normal, allow a few clicks for good measure. Then, press in firmly against the cap and you'll see that you can get another 1/8 or so turn out of the cap. I popped this code 3 times total, the first time the dealer just reset the light. The second time was when he told me about this, and the last time was accidental on my wife's part. :) You can reset the light by simply removing the battery terminal... 30 minutes seemed to work for me... and then reattach. Of course it goes without saying that this is with the car off. Good luck!

Aug 07, 2011 | 2001 Hyundai Elantra

1 Answer

Hyundai elantra periodically will shift hard from second to third gear and then will not shift into overdrive. the check engine light will come on. if i shut off the engine and restart it will shift...


I'm not that user, but go to Autozone and have them scan your computer for the code to your check engine light. It will point you to which sensor to replace, as this is likely your culprit. There are two speed sensors which are critical to transmission shifting on this car. The one I'm familiar with is on the passenger drive axle, but when mine went out (I have a 2001 Elantra as well) I didn't have any of these issues you describe. I don't know where the other sensor is, but that's where I'd suggest starting. Get it fixed quickly though, the web-boards I've read warn that these symptoms can be pretty ******* this little transmission. Good luck!

Aug 01, 2011 | 2001 Hyundai Elantra

1 Answer

Check engine lights ,when make check by computer it gives e vap


Start here... tighten your gas cap till it clicks. Then lean into it with added pressure and tighten further... you should be able to get at least 1/8 turn or more. Then, disconnect your battery terminal (with car off of course) and let sit for 30 minutes. Re-connect terminal, start car. Light should be reset now. If it stays of, there's your problem. If not, the problem is much more involved and you may want to consider a mechanic. This is the free fix that seems to work much of the time. Obviously it just means your gas cap is not sealing well. Mine started doing this at about 50k, I'm over 125k now with no issues. I just have to remember to get that extra tightness every time and no problems. Good luck!

Jun 28, 2011 | 2001 Hyundai Elantra

1 Answer

I have a liltle light in the panel of my car (Hyundai Elantra 2001) that says check engine and the scan problem is the famous ... P0440 EVAP System please help me i really want to eliminate the error !!!...


tightening your gas cap can sometimes fix this problem. Think if the light came on after buying gas.
If not it's usually the rubber seal around the gas cap. Just measure and replace with a similar rubber seal available at any hardware/auto parts store.

May 04, 2011 | 2001 Hyundai Elantra

1 Answer

Hello, I asked the following question a few weeks ago and received a response that this sounded correct. We replaced the Gas Cap and the check engine light is still on after driving about 60 miles. What...


some times light wont reset self got to have it shut off autozone want shut it off but most advance auto will or disconect pos. battery cable for 30 min. it will normaly reset light

Jan 19, 2011 | Hyundai Elantra Cars & Trucks

Not finding what you are looking for?
2004 Hyundai Elantra Logo

527 people viewed this question

Ask a Question

Usually answered in minutes!

Top Hyundai Experts

Marvin
Marvin

Level 3 Expert

85239 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8984 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

14850 Answers

Are you a Hyundai Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...