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  1. #1

    Default Problems after Onstar removed from 2011 Silverado

    When I remove the 2 plugs from the Onstar box, here's what happens.

    1. ABS light on
    2. Emergency brake light on
    3. Traction control light on
    4. Instant fuel mileage indicator doesn't work
    5. Speedometer doesn't function
    6. Engine service light on

    Anybody else experience any of this or know how to make this vehicle operate correctly without Onstar?

  2. #2


    Well first plug the box back in. Here on the site there is a how to on properly removing it from the truck. Just remember the OnStar box is connected to all the systems you mentioned because it can shut off engine and has partial control of brakes if vehicle is stolen. But not sure why speedo isn't working it should be separate.

    1996 Chevy Tahoe LT 5.7L V8 4X4 205,000+ miles. Built proudly at Janesville Assembly in Janesville, Wisconsin
    Basic mods: Lights all over, bunch of electrical work, and a couple cooling mods.

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  3. #3


    Speedo ties into the ABS function.
    GM has a way of disconnecting On Star, but of course their gonna make you pay to get it disconnected.
    I know they hook it to the diagnostic scanner, not sure what they do while connected.

  4. #4


    Yup, Same thing happened to mine when I unplugged. Ended up plugging it back in but Im going to disconnect the antennas at least. Havent done it yet though. Its all part of the system so onstar can notify you when you need to change your oil, and why your engine light is on, and oh yeah dont forget to turn you in when it detects alcohol in the just kidding but that will be next.

    2011 Silverado CrewCab 5.3L*Ram Air Look Cowl Induction Reflexxion Hood*6" Pro Comp Lift*Flowmaster Dual exhaust*Perfect Launch Rear Diff. Cover*Led Smoke Taillights*L.E.D.Smoke 3rd Brakelight*60" L.E.D. Tailgate Bar*Rearview Mirror Reverse Camera and Sensors*Smoke Headlight Covers*Front Bumper Grill Insert*Deezee Black Alum. Diamond Rail covers*20" Ultra Motorsports Rims wrapped with 35.5"B.F. Goodrich Tires*Inchannel Raingaurds*CAI*Bullydog GT Tuner*Alpine Amp*Boss 6x9's*Boston Acoustic Subs*Terrantula Tweeters*Custom Sub box*Red Led Interior Accents*5% Ultimacool duo tint rear window and doors, 20% front doors*Custom Vinyl Graphics*Demolded*Debadged*Painted drums and calipers*
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  5. #5


    In NNBS trucks OnStar is apparently tied to far more than on NBS trucks. Disconnecting the antennae is sufficient to disable remote control and logging of the vehicle via OnStar. That's all that most people require to protect their privacy.

    I never liked the idea of a 'black box' in my truck, though, which is why I tore it out of my NBS truck.

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