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Thread: Reduced engine power 2017 Silverado

  1. #1
    Member SPi's Avatar
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    Default Reduced engine power 2017 Silverado

    2017 Silverado 6.2 -8 spd auto. We installed longtubes and an F1A Procharger. Truck is tuned and our client has been enjoying for a couple months now. Only real issue I have is that ever since the first time i flashed my first tune into it I get a "reduced engine power " message on the dash. The truck runs and drives fine, no codes in the ECM or anywhere else i scan the truck. I have tried a number of things including flashing back to stock adn the message always appears when you start the truck. It's more of annoyance then anything but I would like to fix it for my client. Any ideas ?
    This is the tune.

    Brandon 2017 Silverado.ctz

  2. #2
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    Bump

  3. #3
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    If you adjusted your speed limiter, move it back a bit.

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    Lifetime Member bobo's Avatar
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    Quote Originally Posted by 1906 View Post
    If you adjusted your speed limiter, move it back a bit.

    x2. You can also log the reduce engine power reason. I had one for speed limit mismatch with onstar. Moved speed limiter lower and message is gone.
    2005 Twin Turbo Dmax/Allison Ext. Cab Short Box 4X4
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    Twisted Diesel Tuning-The leader in Duramax Tuning Services and soon to offer Common Rail Cummins Tuning!

    Bobotune at rocketmail dot com

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    Thanks guys, I finally have the truck back at the shop. I'll give this a shot and report back.

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    Well, I moved the speed limiter lower and it fixed my issue up right away!! Thanks bobo and 1906 !!

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    Lifetime Member GMPX's Avatar
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    Good feedback, what a strange thing that is though.
    I no longer monitor the forum, please either post your question or create a support ticket.

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    Yah GMPX, very strange. Truck is running very well, at least 15000 kms put on it now and that was the only issue. I would have thought it would effect other things as well.

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    I have almost the identical truck. 2017 6.2 with Procharger and 8 speed. I’m getting ECM driven throttle blade flutter after 5000 rpm and up to the shift under WOT. Did you experience this? Assume i need to remove torque reduction somewhere?

  10. #10
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    Abesstorage, I don't think I experienced that but I will look at some of my datalogs to confirm for you. I will say that this truck did not drive well at all until I tuned the 8spd trans. The trans. tuning transformed this truck completely, it wasn't enjoyable to drive before I did. It performed well on the dyno, but the street manners and shift characteristics under heavy throttle or WOT were not good.

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