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Cat c-12 Derate and stop engine Light at first start-up

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by stayinback, Nov 20, 2017.

  1. Nov 20, 2017 #1
    stayinback

    stayinback Road Train Member

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    Jan 24, 2014
    chicago,il
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    Have a Cat c-12, Starts then Derates after 5 seconds with engine shutdown lamp..(automatically shuts down)

    Now, After I Restart it between 15 -20 times its Fine- Only Time it does this is when engine is Cold (First thing in morning) Getting real old real fast-Hard on my starter.........Once warmed up-Fine all day

    I DO NOT have Cat -ET to check faults or codes-Nor do I want to have it done either.

    Oil pressure is excellent at the gauge-(mechanical) Water temp sensor replaced

    Could all this be from a faulty oil pressure sensor? Thanks in advance fellas
     
    stayinback, Nov 20, 2017
    stayinback, Nov 20, 2017
    #1
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  3. Nov 20, 2017 #2
    pup

    pup Light Load Member

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    n.h.
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    Coolant level may be a little low. Once it warms the level increases to cover the sensor. Easiest way to repair is to connect to a scan tool & read the faults. Cheaper than throwing parts at it.
     
    pup, Nov 20, 2017
    pup, Nov 20, 2017
    #2
  4. Nov 21, 2017 #3
    GrapeApe

    GrapeApe Road Train Member

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    Does it give you any flash codes? It's possible that an oil pressure sensor could be acting up when cold, but it could also be something else. Blindly swapping parts can quickly add up to a lot of time and money. If you can't get any flash codes out of it, I'd find a small shop with a code reader that won't charge you much to get the faults out of it.

    Cat's will only show active faults when pulling flash codes, so I'd try to pull them on a cold start as soon as it gets an engine light.
     
    GrapeApe, Nov 21, 2017
    GrapeApe, Nov 21, 2017
    #3
    Oxbow and SAR Thank this.
  5. Nov 21, 2017 #4
    stayinback

    stayinback Road Train Member

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    Jan 24, 2014
    chicago,il
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    Ok,Thanks Guys,Hey GrapeApe, Are you Adept Ape?

    No Flash codes Because I Removed the amber engine warning lamp many moons ago-

    Boy I wish an OBD 2 would hook up to these engines

    Anyway, Looks Like I have No Choice but to get someone to scan it- I Hate having Others work on my Truck.
     
    stayinback, Nov 21, 2017
    stayinback, Nov 21, 2017
    #4
  7. Nov 21, 2017 #5
    GrapeApe

    GrapeApe Road Train Member

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    No, I'm not the guy on the Adept Ape YouTube channel. Has a few good video's on there, but I can't take any credit for them, nothing to do with me.

    You should be able to find a small mom and pop type garage that will help you out. If you're stuck with a dealer that wants to charge a min of an hour labor at over $100/hr, you can buy a decent code reader yourself for that.
     
    GrapeApe, Nov 21, 2017
    GrapeApe, Nov 21, 2017
    #5
    Oxbow and SAR Thank this.
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