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Help! Check engine light when going down hills with jake brake on

Discussion in 'Trucks [ Eighteen Wheelers ]' started by SpankingGT, Jun 22, 2011.

Page 1 of 3
  1. Jun 22, 2011 #1
    SpankingGT

    SpankingGT Light Load Member

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    I made my way home yesterday and going thru the wonderful hills of colorado, my check engine light comes on. The light comes on when I'm going down hill with the jakes on but as soon as I blip the throttle-the light goes off. Light dosent come on going up hill but just down hill only with jakes on.

    Any idea what this could be, dealer couldn't replicate the problem.

    Thank You
     
    SpankingGT, Jun 22, 2011
    SpankingGT, Jun 22, 2011
    #1
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  3. Jun 22, 2011 #2
    Pablo-UA

    Pablo-UA Road Train Member

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    any Idea... we got no idea what is the truck, what engine, what year, what a fault code...??

    Can you pull blink codes, ore MID 128 PID/SID/PPID/PSID FMI code to post!
     
    Pablo-UA, Jun 22, 2011
    Pablo-UA, Jun 22, 2011
    #2
    123456 Thanks this.
  4. Jun 22, 2011 #3
    Oscar the KW

    Oscar the KW Going Tarpless

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    What's the flash code? Did dealer plug in?
     
    Oscar the KW, Jun 22, 2011
    Oscar the KW, Jun 22, 2011
    #3
  5. Jun 22, 2011 #4
    SpankingGT

    SpankingGT Light Load Member

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    Opps sorry- 04 columbia - 14l/series 60 detroit- 13 spd trans eaton-

    If it matters, I was loaded to the tee- 79,110. The mechanic told me it could be thin air. I have no idea if he was just messing with me or was serious.
     
    SpankingGT, Jun 22, 2011
    SpankingGT, Jun 22, 2011
    #4
  7. Jun 22, 2011 #5
    Pablo-UA

    Pablo-UA Road Train Member

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    Check engine light is related with engine control unit, you may have DEEC-IV ore DEEC-V.

    Use dashboard to pull stored MID 128 codes. There is a button on right edge of dashboard.... use it... You can use Shutdown Overide button to get blink codes flashed with CHECK ENGINE lamp. But the first way is better
     
    Pablo-UA, Jun 22, 2011
    Pablo-UA, Jun 22, 2011
    #5
  8. Jun 22, 2011 #6
    Frenzy

    Frenzy Medium Load Member

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    Mar 24, 2008
    Seattle, WA
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    I had a similiar problem with my 2000 Century with a C15. The high jake would cut out and then I would get a check engine light. Replacing the two solenoids that controlled the jakes cured the problem.
     
    Frenzy, Jun 22, 2011
    Frenzy, Jun 22, 2011
    #6
  9. Jun 22, 2011 #7
    FYDA FREIGHTLINER CINCY

    FYDA FREIGHTLINER CINCY Light Load Member

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    probally is a code 39 boost jake power. could be anything within the egr system. code is for too much egr flow or too much boost while jake brake is on. could just be a software update too.
     
    FYDA FREIGHTLINER CINCY, Jun 22, 2011
    FYDA FREIGHTLINER CINCY, Jun 22, 2011
    #7
  10. Jun 22, 2011 #8
    Pablo-UA

    Pablo-UA Road Train Member

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    As I remember the problem was in DEEC-IV units only. Ufter reflashing code dissapeared forever, but they offered Low NOx software and engine responce was delayed a bit, and lower low end torque
     
    Pablo-UA, Jun 22, 2011
    Pablo-UA, Jun 22, 2011
    #8
  11. Jun 22, 2011 #9
    SpankingGT

    SpankingGT Light Load Member

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    Okay- dropped the truck off at a different place to figure this out. They are a bit busy but will call me as they get to it.

    I did forget to mention that the PSI gauge would jump just a tad bit as well. I havent felt any loss of power or any other changes.
     
    SpankingGT, Jun 22, 2011
    SpankingGT, Jun 22, 2011
    #9
  12. Jun 22, 2011 #10
    Pablo-UA

    Pablo-UA Road Train Member

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    Anyway all our suggestions are just suggestions, plz! pull the code!
     
    Pablo-UA, Jun 22, 2011
    Pablo-UA, Jun 22, 2011
    #10
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