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code 12

Discussion in 'The Garage' started by FatBoyBlazer, Jul 8, 2003.

  1. FatBoyBlazer

    FatBoyBlazer 1/2 ton status

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    what does it mean...my truck at startup sounds like its got a big cam but it doesn't then i seems to runn normal with the check light on....can any body /forums/images/graemlins/1zhelp.gif
     
  2. MTBLAZER89

    MTBLAZER89 3/4 ton status Premium Member GMOTM Winner

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    code 12 is the normal code to have...you will always get that when you check codes..any trouble codes will come after that flashes 3 times.
     
  3. ZonkRat

    ZonkRat 1/2 ton status

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    Poss the oxy sensor isn't working right till it earms up,making it run rich till then?Just a thought,some one here should have more ideas. /forums/images/graemlins/thumb.gif
     
  4. FatBoyBlazer

    FatBoyBlazer 1/2 ton status

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    thats what it seems like i just put headers on it and had the o2 sensor welded in to the collector
     
  5. angrysnowplow

    angrysnowplow 1/2 ton status

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    Might have to get a heated O2 sensor...that should warm that sumbitch up to the 5 or 600 degrees it needs to be at real quick. /forums/images/graemlins/thumb.gif
    I got a Bosch one- supposed to be 'universal'. Has 3 wires. Black one-same as stock O2
    Two white ones- one ground, one tied in to be hot w/ the key on. I tapped a fuel pump wire, supposedly a lot of people do that.
    Just wait for a few more opinions before you go and spend the $60 /forums/images/graemlins/k5.gif
     
  6. FatBoyBlazer

    FatBoyBlazer 1/2 ton status

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    im also getting a code 13 and 33
     
  7. FatBoyBlazer

    FatBoyBlazer 1/2 ton status

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    aparently a 13 is the o2 and a 33 is a mass airflow..i just dosconected the battery for the night and i'll see if it runs better after a few days
     
  8. angrysnowplow

    angrysnowplow 1/2 ton status

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    Just found this post, was in Canada, Eh /forums/images/graemlins/thumb.gif
    I don't think you have a mass airflow sensor... /forums/images/graemlins/thinking.gif
    Did clearing the codes change anything?
     
  9. 87BrnRsd

    87BrnRsd 1/2 ton status

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    Code 33 is for the MASS sensor if you have tpi, mpi, or efi. I am assuming you have tbi, in which case code 33 means MAP sensor. This is the manifold absolute pressure sensor. It is $27.99 at autozone.
    -Harrison
     
  10. FatBoyBlazer

    FatBoyBlazer 1/2 ton status

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    what side do i disco the neg or pos? /forums/images/graemlins/1zhelp.gif
     
  11. angrysnowplow

    angrysnowplow 1/2 ton status

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    neg. should do it
     
  12. FatBoyBlazer

    FatBoyBlazer 1/2 ton status

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    alrighty thanks
     
  13. dyeager535

    dyeager535 1 ton status Premium Member

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    Save yourself some hassle (radio presets for instance) and pull the ECM fuse. /forums/images/graemlins/laugh.gif
     
  14. FatBoyBlazer

    FatBoyBlazer 1/2 ton status

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