Abs And Esergancy Brake Lights

asimpleword · March 5, 2008

I need some help. I have a 08 silverado z71 4x4. Last week I put a 4" lift with 33" tires. I also just put in hypertech reprogrammer to boost up the hp. My problem is that 2 times now my ABS and Emergancy brake warning lights came on in my dash with a chime. The chime would go off but the lights would stay on. Then when I turned off my truck and turned it back on the lights would be off. I checked my programmer and it said I didnt have any DTC's. I also checked my connections in my wheel wells. Can anybody tell me what is causeing this and should I take my truck in for service.

nthe10ring · March 6, 2008

I have a GMC Sierra with the 5.3 and have had this problem for some time. It started last year and then went away. Both lights come on at the same time. I did notice that just recently it started again and the it was after I had set the parking brake. I dont know if that has anything to do with it or not but the brake seems very loose or light also. I have not noticed any problems with braking during any of this.

Jerry

mkimber · March 8, 2008

Mine recently came on also, but I had just installed 4.10 gears with a truetrac. I'm assuming it's something to do with the different than factory gear ratio. I do notice my brakes don't quite seem to work as well, but I'm sending my pcm back to Jesse this next week to get it adjusted for the gears. Hopefully, this will fix the problem.

gmtech4 · March 8, 2008

there is no usual fix,it has to be diag'd,there are codes ,I've said before that electrical diagnosis on the internet is almost impossible,guys ,take it to your fav tech,if its intermittant ,then it was somthing stupid like a big puddle,later

nthe10ring · March 7, 2008

What is the usual fix for a problem like this.

Jerry

gmtech4 · March 7, 2008

your parking brake will only light up the red brake light with the exclamation point in it ,ABS will lite up both ,read your owners manual,it says all this,when both lights come on your brakes go back to base brakes,they work fine but you do not get the benefit of steering on a panic stop,and stopping distance decreases

gmtech4 · March 5, 2008

it is under warrenty ,those lights indicate DTC's for the ABS/TCS module,maybe your programer is not able to read the ABS module DTC's,make an appointment.