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Discussion Starter · #1 ·
Just left for 6hr trip, and "service brake system" popped up on the info dash screen, and the ABS light with the PARKING BRAKE LIGHT. any ideas?
 

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You should fill out your signature with the year and mods done to the truck. It helps when you ask a question!

No one knows what you drive but you! :rolleyes:
 

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Did you just dyno the truck? Or power brake? (or God forbid, get stuck?) Mine did the exact same thing after dynoing at Georgia Diesel. Makes sense. The front tires are stationary and the rear tires are spinning probably 70mph or so. Sensors go ballistic. I was told it should go out after several key cycles or driving some distance. I cycled the key switch probably a dozen times as well as cranking and shutting off the truck. That didn't fix it. After the event, I drove out (the driveway is over 1/2 mile long). Once I turned on the blacktop road, everything was normal again. I don't know if the key cycles AND the driving did it, or if it was just the driving. Anyway, if you were spinning the rear tires for whatever reason, that will cause it to do exactly what you have stated.
 

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If you have efi go into your speedometer settings and make sure your revolationis are right because mine did the same thing after I downloaded a tune and forgot to change the tire size not saying that's why it threw up the warnings but give it a try
 

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My truck has been doing the same thing.It all started when I was spinning up a hill in 4 wheel drive.Now it just comes on once in a while when I am turning to the right,but not at slow speeds.My truck is a 2004 gmc with a edge with attitude.I cant figure it out for the life of me.
 
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