2000 Wrangler, CEL on - no codes given after diagnostics - Jeep Wrangler Forum

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Old 04-14-2012, 05:23 PM
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2000 Wrangler, CEL on - no codes given after diagnostics

Hi, I have a 2000 Jeep Wrangler 4.0 and its check engine light came on Thursday afternoon. This morning I took it to O'Reilly's and used their OBD scanner to no avail (it could not establish a link). I do not believe fuses are the issue here as my cigarette lighter still works. If fuses are the issue, I have no idea which fuse may be at fault.

I have attempted the self diagnostic test involving holding the odometer reset button down then turning the key on three times. It appears to perform the diagnostics test but it reverts to my mileage rather than throwing a code after the test. This is not my video, but my Jeep does the same thing this Cherokee does:

Does anyone have any ideas as to how I should proceed? I would really like the get the trouble code(s) as my CEL has remained on since Thursday. Thanks for any help you can provide.
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Old 04-14-2012, 06:24 PM   #2
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You can't use the odometer trick with the 2000... All you are doing is performing an instrument check. Unfortunately, you have to pull the codes somehow, and that may mean a trip to a dealership since the local parts store can't help. It's an unfortunate feature for our year Wranglers...

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Old 04-14-2012, 06:25 PM   #3
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To start off, when you do the on-off thing you DON”T hold the reset button to get the codes. Now the bad news, on some yrs that feature doesn’t work & I think 2000 is one of them. Try it to see. Check the OBD port contacts. See if there is corrosion or anything that may be causing the scanner to not connect.
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Old 04-14-2012, 07:06 PM
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Thank you both for the info, even if it is bad news.

Quote:
Originally Posted by RUBI 4 MY MRS View Post
To start off, when you do the on-off thing you DON”T hold the reset button to get the codes. Now the bad news, on some yrs that feature doesn’t work & I think 2000 is one of them. Try it to see. Check the OBD port contacts. See if there is corrosion or anything that may be causing the scanner to not connect.
Prior to attempting to run a diagnostics test using the odo reset, I did try the turning the key to on three times without any other steps. As you surmise, this did nothing except turn the dash on.

OBD port contacts look good, even with 200 lumens shining on them. The scanner did turn on the moment I plugged it in as well.

Looks like I'll be making a trip to the Jeep dealership.
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Old 04-14-2012, 07:13 PM   #5
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Welcome to the Forum

It is true that you cannot pull the code yourself in the 1999-2000 models with the key trick. You stated that you took it to O'Rileys and they could not pull the code for you. The first thing that I would do is remove the battery cables for about 10 minutes to clear any stored codes and see if it comes back.
Some issues are self correcting, but it takes many starts for the light to go out even though the code is cleared. A loose gas cap is a good example.
My 06 would throw a code every time that it rained. The cel would go back off after 10 or so starts but would not store the code.
So don't start throwing money at it just yet. If you disconnect and the cel comes back on, try a different shop to try to pull it for you.
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Old 04-15-2012, 11:52 AM   #6
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Try this....turn on key to test all warning lights.....Are any, not lit?...Airbag, ABS and so on?

If one is out, go see dealer.....On some cars, the CEL will light if a simple warning light for any other warning fails....Yup....and it won't pop a code.

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