i-Shift Transmission Problem, dealer blames the driver

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Silver Bear, Dec 3, 2018.

  1. Silver Bear

    Silver Bear Light Load Member

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    2016 Volvo VNL780, D13, i-Shift, 268K miles.

    Took the truck to the dealer because transmission was suffering from some rough shifts. They are saying that the driver was using gas pedal instead of the brakes to hold the truck in place, therefore the warranty may not cover the repairs. Has anyone ever heard something like this? I asked for the actual codes, haven't gotten them yet. But this is what the request for authorization to remove the transmission for further inspection says:

    C/S THE TRANSMISSION SHIFT HARD FROM 6TH TO 7TH AND SHAKES WHEN DOWN SHIFTING FROM 12TH TO 11TH, C/A. Cause: BROUGHT TRUCK INTO SHOP AND CONNECTED TECH TOOL AND FOUND CODE FOR BRAKE PEDAL STATUS AND CLUTCH PLATE LOAD WHICH INDICATES THROTTLE IS BEING USED TO HOLD TRUCK INTO PLACE INSTEAD OF PRESSING ON BRAKE. PERFORMED GEAR ENGAGEMENT TEST AND FOUND TEST FAILED AND RESPONSE WAS NOT NORMAL. IT IS RECOMMENDED TO REMOVE AND INSPECT TRANSMISSION INTERNALS.

    Honestly, sounds like a bunch of BS. If they refuse to cover under warranty, I am screwed bigtime! :(

    UPDATE: Got the codes from the diagnostic report:

    Active Transmission Brake Switch Status - Unexpected Operation P105594 Count:121
    Inactive Transmission Clutch Plate Load - Actuator Slipping P106074 Count: 88
    Inactive Transmission Clutch System - Unexpected Operation P107594 Count: 6

    PLEASE HELP!
     
    Last edited: Dec 3, 2018
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  3. Brandt

    Brandt Road Train Member

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    Sounds like it would be a new clutch. An expensive clutch but the transmission would still be good. Detroit D12 auto shift has a warning on dash if you get the clutch hot, say from not using the brakes. Maybe someone know more about the ishift transmissions
     
    Silver Bear Thanks this.
  4. AModelCat

    AModelCat Road Train Member

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    I would ask for the histogram if possible. Not sure if Volvo uses it or not though. Histograms will typically record the number of occurences of certain conditions over the entire life of the component.

    And yes it is possible for a driver to burn up a clutch by slipping it to try and hill hold. Not sure about the I-Shift specifically but most automatics are just manuals that have been automated. There are no torque convertors, just clutches.
     
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  5. magoo68

    magoo68 Road Train Member

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    One guy where I work burnt a clutch in 2 weeks they covered it . Then he burnt another it turns out he was leaving it in gear when parked sometimes .. he paid for second clutch and had gone 4 years or so now problem free after they explained proper way to drive it
     
  6. benjamin260_6

    benjamin260_6 Medium Load Member

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    That would definitely mess up the clutch but wouldn't cause hard shifting in the transmission.
     
  7. Silver Bear

    Silver Bear Light Load Member

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    It's an experienced driver that has had this truck for the past 6 months with no issues. He swears up and down he doesn't ever hill hold with the throttle.
     
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  8. x1Heavy

    x1Heavy Road Train Member

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    I cannot recall ever using a brake to control a automatic under power like I would a ancient 70's pre-emissions boat with a whipped 460 in it.

    But if that is indeed the problem then that would be abuse no?

    I don't know enough other than to think well, sometimes you gotta brake at 70 mph and 12th gear or wherever dontcha?
     
  9. magoo68

    magoo68 Road Train Member

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    Does volvo have a clutch overheat abuse light ?? If so it should register events I’d think ..
     
  10. ZVar

    ZVar Road Train Member

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    On the driver display screen it will say "clutch protection activated" whatever that means. I usually get it when pulling out of the dock well when I'm being impatient and not waiting for the air to build up. Don't give the brakes a chance to release.
     
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  11. THANASSIS

    THANASSIS Bobtail Member

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    100% bs, run away from there, find a number and complain to Volvo. The computerized trans control system is bulletprof regarding driver damaging trans internal, or clutch. Something else is wrong and not the transmission internals. My daughter drives an i shift and usually in the beginning when she start driving the truck she had all most every time she got stuck in traffic the message coming up related to improper driving the truck. . Till i explain to her the proper way. Warranty work pays much less that you will pay them. They will get you because they know you have to go on the road. Either spent time looking for another shop, or pay the money
     
    sirjeff Thanks this.
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