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Thread: Cruise control not working 18 Colorado v6 8l45

  1. #1
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    Cruise control not working 18 Colorado v6 8l45

    Hey guys,

    2018 Chevy Colorado v6, unlocked TCM, regeared from3.42 to 4.56 diffs, and running 35 inch tires. Stock was 30.5

    Truck was tuned by peitz performance and outside of the shifts are a little hard when daily driving (they are great when driving fast in the high desert), the cruise control stopped working. Everything else is fine.

    I didn?t realize it at first, just thought I had not figured out the switches yet on the steering wheel. But I am hearing others report now that with new gears their cruise control doesn?t work.

    Tire diameter has been programmed in as well as the gear ratio.

    Anything I should look for in the TCM or ecu programming to get it to work again?

  2. #2
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    It’s the abs/traction control speed sensor that is not currently available to be adjusted. So when tires and/or gears are adjusted then it doesn’t match up and issues occur. Support ticket in, they are looking into adding the feature.

  3. #3
    Tuner in Training
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    Bump. Any updates?

  4. #4
    Tuner in Training
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    Any updates on this?

  5. #5
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    I started a ticket, but no luck yet . Others need to as well to get enough squeaky wheel for hptuner to unlock more features of the tcm

  6. #6
    Tuner in Training
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    Well my gears are being installed next week. So I will try my luck at correcting the speedometer.

  7. #7
    Advanced Tuner ZeroBoostBuick's Avatar
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    Post your tune please. maybe someone can spot something and lead you in the right direction.

  8. #8
    is there a fix for this cruise control issue yet?

  9. #9
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    Start a ticker. I’ve heard yes and no... but my truck has been out of commission since feb so I haven’t been able to verify. Let us know what they say!

  10. #10
    yeah...just put the ticket in. i've always adjusted my tire/gear changes with vss revs in speedo section, and never had a problem til 2019 tahoe...and i cannot get the cruise to set now with this method. lots of chatter on forums about same issue, but nothing definitive as far as solution.

  11. #11
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    Are you running the most up to date OS? I thought that their April or May software update had fixed the cruise control issue?

    It’s basically there are two vss signals being sent. One to the ecu where we can adjust it with the tire and gear wizard. And then the second which goes to the bcm or the abs computer. If these two don’t match then the cruise doesn’t work and your traction control activates more easily than normal. (Even if turned off like the zr2 advertises, but still has a little bit on).

    Other tuning systems like the parent system trifecta uses (it’s “blue” something or other I think” has the two vss issue sorted.

    So it can be done through the regular obd2 system and doesn’t need a hardware change.... I just thought HPTuner said they had fixed that...
    I hope so because having the traction control activate all the time destroys rear brake piston seals.

  12. #12
    no...i'm not, but i talked to bill this afternoon, and he says this is still an intermittent problem, with no fix. i was kinda hoping it was a 12v on/off that i could figure out in bcm, but doesn't seem it would be then. i tried both ways by the way...adj vss revs in speedo tab, and the tire gear wizard...neither worked.

  13. #13
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    Yea. I tried all the different tire vs gear wizard etc.

    If you back search the blue what ever transmission tuning spread sheet name, the parent company of the operating system that trifecta (and some others) use.

    I believe the owner of that company is associated either with GM or the company that makes the physical ecu TCM etc etc. their website talks about the two vss and the bcm or abs computer needing to be recalibrated to match the gears and tire size.

    I asked a dealer if they could use the factory J computer to adjust it (which it will) but they would not due to some bs.

    So if you have access to a dealer network computer, it can adjust the bcm and the necessary fields

  14. #14
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    Tunercat.com

    That’s the os they use

  15. #15
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    Apparently the new os has the second vss sorted. I know the traction control doesn’t freak out like it used too. I need to double check the cruise control later.