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Thread: 8l45 tune?

  1. #1
    Tuner
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    8l45 tune, help with 2-3 shift?

    My 8l45 on my 18 colorado was remote tuned but Im having an issue with 2-3 gear shifting when driving non aggressive. When Im hammering on it everything seems fine. WHen cruising around, 2nd holds gear and rpms just rise and rise and rise up past 5k...and then it will shift to 3rd, almost like if you were driving a manual transmission and you have a shift where you rev the engine causing the rpms higher than the trans is spinning and then, not exactly dumping the clutch, but releasing fast and the vehicle kind of lurches forward or speeds up until the two match speed.

    Anyways, if anyone can take a look at the tcm tune and let me know if they see anything that could be massaged to help.

    Ive reached out to the tuner a few times but I have never had a response.
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    Last edited by fifty; 10-18-2019 at 02:10 PM. Reason: updating

  2. #2
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    Does anyone have a stock 8l45 4wd Colorado trans tune?
    I can?t find mine. Long story. Boring really.

    So looking for an 18 or 19 (maybe the 17 is the same?) as i have an 18 zr2

    Thank you

  3. #3
    Potential Tuner
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    I'd give you a copy of mine, but the TCM function seems tied to the ECM portion of my tune, and my truck is tuned for the Mallett Supercharger. I can give you what I have, but definitely don't use any of the ECM stuff.

  4. #4
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    Quote Originally Posted by TheDude1024 View Post
    I'd give you a copy of mine, but the TCM function seems tied to the ECM portion of my tune, and my truck is tuned for the Mallett Supercharger. I can give you what I have, but definitely don't use any of the ECM stuff.
    Pm sent with my email! Thank you

  5. #5
    Potential Tuner
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    Reply and email sent!

  6. #6
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    Thanks man, you rock!!!

  7. #7
    Potential Tuner
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    I am installing the Mallett supercharger within the next couple of weeks, but will be doing and entire read of the stock tuning prior to sending my ECM to Mallett. If this is still of any use to you. My truck is a 2018 GMC Canyon 3.6L 4wd.

  8. #8
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    Yes please!!

  9. #9
    Potential Tuner
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    Stock 2018 Canyon tune

    Here you go this is stock 2018 GMC Canyon V6 SLT - Edit: Oops I just realized you wanted TCM, I am sorry but I needed to get a code from HPTuners to unlock the TCM in order to read it and did not do that.
    Attached Files Attached Files
    Last edited by c2vette; 03-25-2020 at 01:59 PM.

  10. #10
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    Thank you

  11. #11
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    I think you need to send the TCM for an unlock to read it? Or can you read it if you license the TCM even if it’s not unlocked?
    I don’t know lol