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I HAVE A 94 S10 BLAZER AND IM GETTING A CODE 12. DOES ANY BODY KNOW WHAT THIS MEANS AND WAYS TO FIX IT. THANKS.
 

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Code 12?....Diagnostic mode.
 

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ROD TWISTIN MEMBER
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the book that came with my scanner says the same thing:idea:
 

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Reseach and Devolopment
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yeah i means nothings wrong. i couldnt figure out what it meant at fisrt, but then my scanner told me everything was A-OK!!

is it pulling any other codes?
 

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I would unplug the battery to clear.
 

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Code 12 will always be present IF your ride is running right.
It's simply an RPM reference signal sent to the ECM to show
you that the dist is indeed sending a signal. If it didn't show
this code when going into the diag mode, it spells trouble,
unless the lite is burned out for those you use the "ses"
to count codes. All is good, if all you get is a code 12 three
times and a code 55 at the end of the data stream..Code
55 being the ID code letting you know that the diag code
retrieval is finished..Now some rides will just go the 12 code
over and over, others the 55 code. Anything in between are the
trouble codes. This mostly pertains to CCC and OBD I Platforms.
 
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