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Cummins isx15 won't rev past 1500rpm

Discussion in 'Trucks [ Eighteen Wheelers ]' started by mitmaks, Apr 17, 2019.

  1. Apr 17, 2019 #1
    mitmaks

    mitmaks Road Train Member

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    Got this problem with 13 KW T660 Cummins ISX15 that it won't rev past 1500 no matter what. Problem is more present in low gears 2-5. If I've got load on or not-doesn't matter. It still only goes up to 1500rpm and if I'm climbing hill its hard to grab next gear cause rpms/speed is not high enough. I'm thinking maybe throttle position sensor.??
     
    mitmaks, Apr 17, 2019
    mitmaks, Apr 17, 2019
    #1
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  3. Apr 17, 2019 #2
    pushbroom

    pushbroom Road Train Member

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    Check engine light on?
    Is it a new truck to you? It might have progressive shifting and rpm limiting enabled
     
    pushbroom, Apr 17, 2019
    pushbroom, Apr 17, 2019
    #2
    Goodysnap, KB3MMX, magoo68 and 1 other person Thank this.
  4. Apr 17, 2019 #3
    S M D

    S M D Road Train Member

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    Well if it’s been governed by previous owner or your company at 1500 then that’s why. I’m sure the parameter is set to cut off there my Volvo was like that too. It was annoying when you try to shift it won’t let because the truck is moving faster than what your rpm allows
     
    S M D, Apr 17, 2019
    S M D, Apr 17, 2019
    #3
  5. Apr 17, 2019 #4
    mitmaks

    mitmaks Road Train Member

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    It wasn't like that a while ago. I've been driving it for the past 5 years. It just slowly switched to being like that.
     
    mitmaks, Apr 17, 2019
    mitmaks, Apr 17, 2019
    #4
  7. Apr 18, 2019 #5
    KB3MMX

    KB3MMX Road Train Member

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    Do you have a clutch switch
     
    KB3MMX, Apr 18, 2019
    KB3MMX, Apr 18, 2019
    #5
  8. Apr 18, 2019 #6
    mitmaks

    mitmaks Road Train Member

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    Clutch switch?
     
    mitmaks, Apr 18, 2019
    mitmaks, Apr 18, 2019
    #6
  9. Apr 18, 2019 #7
    KB3MMX

    KB3MMX Road Train Member

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    Look under the dash for any switch activated by depressing the clutch...

    If it has one and it's going bad it'll turn on a free rev governor while it "thinks" you're depressing the clutch even though you're not
     
    KB3MMX, Apr 18, 2019
    KB3MMX, Apr 18, 2019
    #7
    mitmaks Thanks this.
  10. Apr 18, 2019 #8
    Goodysnap

    Goodysnap Road Train Member

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    Have you had service work performed that may reflect a change in ECM parameters? Software updates ect. It is possible that settings got jacked or parameters didnt restore correctly during a flash. I agree it sounds like progressive shift or parameter issue.
     
    Goodysnap, Apr 18, 2019
    Goodysnap, Apr 18, 2019
    #8
    KB3MMX Thanks this.
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