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Thread: 4L70e Shift mode "unknown" and early shift on WOT

  1. #1

    4L70e Shift mode "unknown" and early shift on WOT

    Hello,

    I recently had my transmission replaced - 4L70e, replaced with 4L65e. Now it will not shift according to the shift schedules and WOT.

    Trans will shift 1->2 and 2->3 as per the lowest speed setting at 0 Throttle Position regardless of actual Throttle position.

    When I floor it to test WOT shifting, it will bog and 1->2 shift almost instantly and be in 4th gear right away and will not rev out between gears as per WOT speed and RPM settings.

    "Trans Shift Mode":
    During part throttle shifting, VCM Scanner is stating it is in Normal WOT mode. As soon as a go 100% throttle, Trans Shift Mode says "unknown 0c". What does that mean?

    The transmission shop says there should be no physical difference and the replacement transmission has the same pin connector as my original.

    Any help is appreciated.trans test 7.hplDarin 6.0l engine 2008 L76 Rev 2.2(Speedo and tire size added and transmission Blue Cat).hpt

  2. #2
    Tuning Addict
    Join Date
    Apr 2017
    Posts
    10,887
    "Unknown" is nothing to do with it, they all do that. It's not a valid data PID. Trans Current Gear, Trans Pressure Mode, Trans Shift Solenoid Pressure Mode will give you things that are actually useful.

    Your Full Throttle Shift RPM somehow got set to 8,192. It helps to compare with a stock file, check the comparison log.

    You've got more problems, though. How is it 190* ECT and still 'OL - Not Ready'? You have some kind of wiring problem after the trans swap, I think. Those are some of the weirdest O2 traces I have seen anywhere (and most likely either the cause of the no CL thing, or something else is causing both issues).
    Quote Originally Posted by SiriusC1024 View Post
    I think they're junkyard rebuilds.