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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-02-2003, 02:39 AM   #1
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sometimes when i just start my car and get on it a little bit....i notice that my SES light comes on....i got one of htem gm code readers from walmart for 20 bucks and it saids its number 12..on the abs thing...it was i think something wiht the abs brakes....but i remember off hand....and its at teh car so i dont hve it...but after like 3 min it will go off....why would hte abs cause this? does nayone know?
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Old 06-02-2003, 02:44 AM   #2
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On a 92, the ABS can't set a SES light. No ABS codes go through the PCM. Code 12 is the 'handshake code', kinda like the modem sqeal in the old days. It just tells you you're communicating with the PCM. Should flash 12 three times, then any stored codes three times each, then 12 three more times.

Try again, and see if you get anything after the third 12.
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Old 06-02-2003, 02:46 AM   #3
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why does it happen only sometimes then? Like the other night....but only wehn i got on it hard...its not a everyday occurance....
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Old 06-02-2003, 02:49 AM   #4
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I'm betting oil level sensor in the pan, but that'* a shot in the dark. I've seen that on other cars here. If there'* a code, it'll help. If not, you may have to have it scanned for history codes.
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Old 06-02-2003, 02:55 AM   #5
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well that code reader is a pile of crap...it was 20 bucks from walmart..i plugged it in and the light blinked once then pause then twice and the book said 12...ill grab it tomorrow and tell ya what 12 is the full description....
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Old 06-02-2003, 02:57 AM   #6
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The 12 isn't a fault code. You can scan for codes in your car with a paper clip. You need the code AFTER the handshake '12' code, if there is one. The Walmart scanner isn't capable of displaying history codes, either. Only current codes. You'll need a scantool for that.
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Old 06-02-2003, 02:57 AM   #7
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ahhhhh i see....
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Old 06-02-2003, 03:06 AM   #8
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Old 06-02-2003, 03:07 AM   #9
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hey thanks will
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Old 06-02-2003, 03:12 AM   #10
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No prob Dave. I want video of you driving over that Walmart tool! Don't tell Jr! He works there!

Just remember.....the scantool is a much better investment, but rather spendy. Plan on it at least eventually. It'll save you money in the long run on a problem like you're having now.
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