C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Pulled the code from my 96...What does C12 mean?

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Old Feb 16, 2004 | 09:40 PM
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Default Pulled the code from my 96...What does C12 mean?

I have the service manuals, which I have a hard time following, and I can't figure out what C12 means. Also, I can't figure out how to reset the "service engine soon" light. Any have any ideas?
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Old Feb 16, 2004 | 11:11 PM
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Default Re: Pulled the code from my 96...What does C12 mean? (NE14SIN)

C12 is a check digit, it just means you engaged the code display correctly. Check engine light has to be reset by an interface.


[Modified by Chosen Won, 4:18 AM 2/17/2004]
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Old Feb 16, 2004 | 11:20 PM
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Default Re: Pulled the code from my 96...What does C12 mean? (NE14SIN)

It means that the system is working correctly. No other codes? Pull off the negative battery cable for a minute to clear any lurking glitches. Over the years, my SES has lit for no apparent reason. If it's not showing any other codes, it's propably just a hiccup in the system
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Old Feb 16, 2004 | 11:30 PM
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Default Re: Pulled the code from my 96...What does C12 mean? (vetteseniorcit)

I'm pretty sure that unhooking the battery won't do anything. That only works on OBD I systems. A 96 has OBD II. I do agree that it is probably something small.
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Old Feb 16, 2004 | 11:35 PM
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Default Re: Pulled the code from my 96...What does C12 mean? (NE14SIN)

Codes C-12 means: your car is seeing the concept well beyond
C-5...... :lolg: :lolg: :lolg: :lolg: :lolg: :lolg: :lolg: :lolg: :lolg: :party: lol

but seriuosly its the check system start/stop code :hurray:
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Old Feb 17, 2004 | 08:36 AM
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Default Re: Pulled the code from my 96...What does C12 mean? (NE14SIN)

I have the service manuals, which I have a hard time following, and I can't figure out what C12 means. Also, I can't figure out how to reset the "service engine soon" light. Any have any ideas?
It means you pulled the code from the CCM and the CCM is working fine. You can NOT pull PCM codes on a '96 by jumpering pins on the diagnostic link like you could with earlier years. If I recall, the Service Manual in a few areas says you can but it is in error and I believe later revisions caught the oversight.

OBD II codes are 5 characters long Pxxxx where "P" is for powertrain and "xxxx" is the numberical code. A 5 character code will not display on the 3 character digital speedo.

You either need to take it to a shop, a parts store (some will scan it for free), buy an OBD II code scanner, or buy OBD II scanning software and interface cable for use with a laptop.

As for resetting the SES light, sometimes disconnecting the battery will work and sometimes it won't. Just recently I had a couple PCM codes that, after the problem was corrected, still required me to use my scanning software to reset/command the light to "off".


[Modified by 96GS#007, 7:37 AM 2/17/2004]
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Old Feb 17, 2004 | 09:27 AM
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Default Re: Pulled the code from my 96...What does C12 mean? (96GS#007)

Disconnecting the battery will not reset the computer, I had the same question a few days ago and tried it. You need to have a computer interface to reset our systems.

I had a check engine light come on prior to my retrieving codes, mine was for an O2 sensor. I replaced the sensor and the check engine light hasn't come on since, didn't need to reset anything for it. The problem I have now is that I still get a code c13 for the O2 sensors, I'm not going to worry about it though, I don't think it alters the performance of the engine since the problem has already been corrected. I hope.
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Old Feb 17, 2004 | 10:08 AM
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Default Re: Pulled the code from my 96...What does C12 mean? (Chosen Won)

I'm pretty sure that unhooking the battery won't do anything. That only works on OBD I systems. A 96 has OBD II. .
:withstupid: :yesnod:
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Old Feb 17, 2004 | 10:10 AM
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Default Re: Pulled the code from my 96...What does C12 mean? (korvette4u)

Codes C-12 means: your car is seeing the concept well beyond
C-5...... :lolg: :lolg: :lolg: :lolg: :lolg: :lolg: :lolg: :lolg: :lolg: :party: lol

but seriuosly its the check system start/stop code :hurray:
:lol: Tell all the C5 guys you have a C12 and their cars are for redneck poor people.
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Old Feb 17, 2004 | 10:41 AM
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Default Re: Pulled the code from my 96...What does C12 mean? (Kizmo)

Disconnecting the battery will not reset the computer, I had the same question a few days ago and tried it. You need to have a computer interface to reset our systems.

I had a check engine light come on prior to my retrieving codes, mine was for an O2 sensor. I replaced the sensor and the check engine light hasn't come on since, didn't need to reset anything for it. The problem I have now is that I still get a code c13 for the O2 sensors, I'm not going to worry about it though, I don't think it alters the performance of the engine since the problem has already been corrected. I hope.
I believe if it's an emissions related code you have to reset using scanning software. If it's a non-emissions related PCM code, you can reset by disconnecting the battery.
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Old Feb 17, 2004 | 07:12 PM
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Default Re: Pulled the code from my 96...What does C12 mean? (96GS#007)

Thanks for all of the help guys, it looks like I will be buying an Autotap soon.
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