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| pianoguy | SES light, no codes | ||
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Guru Emeritus
 
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On the way home from work last night, my Service Engine Soon light came on. The car was running fine, temps good, etc. I checked for codes, but there was nothing. I disconnected the battery for a few minutes, hooked it up and the light went away. And the drive to work today was fine. Any idea as to what might have caused that? I did have the targa top off, so there was probably a little more vibration than normal, but nothing outlandish.
Thanks in advance! |
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Posted on: 2008/4/23 12:12
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1996 LT4 �Before you criticize someone, you should walk a mile in their shoes. That way when you criticize them, you are a mile away from them and you have their shoes.�- Jack Handey |
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| pianoguy | Re: SES light, no codes | ||
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Guru Emeritus
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After several days of driving, the light came back on again this morning on the way to the office - I won't get to pull the codes until I get home tonight. Assuming no codes, what could be causing this? Loose wire somewhere, maybe?
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Posted on: 2008/4/29 12:19
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1996 LT4 �Before you criticize someone, you should walk a mile in their shoes. That way when you criticize them, you are a mile away from them and you have their shoes.�- Jack Handey |
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| toptechx6 | Re: SES light, no codes | ||
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Two things occur to me being a 96, if you are trying to pull codes with a paper clip they may not display properly, since it is OBDII. The second thought is your scan tool if you are using one.
Many OBDII scanners only read the "generic" codes required by government mandate under OBDII protocol that is why some scan tool makers offer "enhanced" software at extra cost that will read proprietary (manufacturer specific) codes. Normally if the light comes on there is a code stored, just a matter of being able to read it, good luck. |
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Posted on: 2008/4/29 13:24
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| pianoguy | Re: SES light, no codes | ||
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My wife bought me an OBDII scanner (don't remember what brand/model), and it didn't work, so I used the paper clip method. It seemed to cycle through all the modules, and displayed C12, I believe - whichever code says that there are no codes.
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Posted on: 2008/4/29 13:28
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1996 LT4 �Before you criticize someone, you should walk a mile in their shoes. That way when you criticize them, you are a mile away from them and you have their shoes.�- Jack Handey |
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| pappyfreebird | Re: SES light, no codes | ||
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Senior Guru
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my lil truck was doing same as you describe 4.3 v6...but it was the oxygen sensor in exhaust..itd go off with unhookin bat..n fine fer couple daze then back on...so went to advance n plugged it in there...then bought one sensor n switched them tell cured it...n yeup it was the last one ,,,but got it
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Posted on: 2008/4/29 14:48
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| pianoguy | Re: SES light, no codes | ||
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Guru Emeritus
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Quote:
Thanks - something to be on the lookout for. It never fails that it's the last one, does it? ;-) |
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Posted on: 2008/4/29 15:23
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1996 LT4 �Before you criticize someone, you should walk a mile in their shoes. That way when you criticize them, you are a mile away from them and you have their shoes.�- Jack Handey |
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| toptechx6 | Re: SES light, no codes | ||
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Senior Guru
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Before throwing any parts at it, try stopping by AutoZone to see if they can pull a code for you, they should do it for free from what I've been told.
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Posted on: 2008/4/29 15:42
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| pianoguy | Re: SES light, no codes | ||
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Guru Emeritus
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I just got home, and am waiting for FedEx to come pick up a package, so I poked around a bit. I found that the connector to the MAF wasn't snapped in tightly. So I disconnected the battery to reset the light and will see if that does the trick. If not, I'll swing by AutoZone next time it happens. I need to figure out what's wrong with the gizmo my wife got me - it's called a V-Checker:
http://www.vchecker.com/product/OBDBASIC.htm |
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Posted on: 2008/4/29 20:22
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1996 LT4 �Before you criticize someone, you should walk a mile in their shoes. That way when you criticize them, you are a mile away from them and you have their shoes.�- Jack Handey |
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| benny42 | Re: SES light, no codes | ||
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Guru Newb
 
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Just tossing out an idea. Check your lighter fuse. My
truck OBD2 port uses that B+ to power the scanner. The truck runs ok with that fuse blown, but the scanner won't work. Good luck with it. benny |
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Posted on: 2008/4/30 1:37
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| pianoguy | Re: SES light, no codes | ||
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Thanks, Benny - I'll check that.
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Posted on: 2008/4/30 3:01
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1996 LT4 �Before you criticize someone, you should walk a mile in their shoes. That way when you criticize them, you are a mile away from them and you have their shoes.�- Jack Handey |
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| CasetheCorvetteman | Re: SES light, no codes | ||
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Elite Guru
 
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Quote:
C12 means nothing at all in any other module other than Module 1, which is the CCM module. The CCM module DTCs will not set the SERVICE ENGINE SOON light, they will flash SYS on the instrument cluster. You can have every single DTC known to man in the other modules, but if there is nothing in Module 1, youll get C12. The way the other modules indicate no DTCs is by displaying "- - -" in the main display above the module number. |
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Posted on: 2008/4/30 6:19
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| pianoguy | Re: SES light, no codes | ||
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Quote:
Forgot to mention that - as it cycled through, all the other modules displayed just that. |
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Posted on: 2008/4/30 10:30
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1996 LT4 �Before you criticize someone, you should walk a mile in their shoes. That way when you criticize them, you are a mile away from them and you have their shoes.�- Jack Handey |
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| CasetheCorvetteman | Re: SES light, no codes | ||
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Elite Guru
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Then the DTC you have is of the OBD2 variety and can be reliably read using a TECH2 unit.
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Posted on: 2008/4/30 10:34
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