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2015 Prostar wont go past 5th gear fault code 71

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by A T Trans Inc Texas, Nov 30, 2021.

Page 2 of 2
  1. Dec 4, 2021 #11
    Heavyd

    Heavyd Road Train Member

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    Source address 3 is the transmission. 560 is unable to disengage gear, but only FMI 7. There is no 560 FMI 11. Your next step is to get this scanned by someone with Service Ranger software.
     
    Heavyd, Dec 4, 2021
    Heavyd, Dec 4, 2021
    #11
    QUALITYTRUCK Thanks this.
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  3. Dec 5, 2021 #12
    A T Trans Inc Texas

    A T Trans Inc Texas Bobtail Member

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    Nov 30, 2021
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    Thanks for reply. It's the clutch. Getting it replaced tomorrow.
     
    A T Trans Inc Texas, Dec 5, 2021
    A T Trans Inc Texas, Dec 5, 2021
    #12
  4. Dec 5, 2021 #13
    A T Trans Inc Texas

    A T Trans Inc Texas Bobtail Member

    9
    1
    Nov 30, 2021
    0
    It's the clutch. Thanks for reply.
     
    A T Trans Inc Texas, Dec 5, 2021
    A T Trans Inc Texas, Dec 5, 2021
    #13
    Heavyd Thanks this.
  5. Dec 5, 2021 #14
    ChuckMartel

    ChuckMartel Light Load Member

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    Jan 22, 2021
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    Sounds fishy to me. Typically when your clutch is hanging up it won’t disengage a gear or won’t go into your default start gear, but from your explanation it goes into gear fine and shifts until 5th fine.

    Id definitely take the cover off the range valve, replace the o-rings on the piston and relube it and the cylinder.
     
    ChuckMartel, Dec 5, 2021
    ChuckMartel, Dec 5, 2021
    #14
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