well i just put some 37"s on my truck about 2 weeks ago now i just recalibrated the speedo with my bullydog programmer and now everyone once in a while i get the ABS and brake light come on and i turn off the truck and it might come on or might not,Anyone have this happend to them

You need to have the ABS module programmed to match the size you put in the PCM, you are setting a mismatch code...

so i should take it into the dealer so they can reprogram it,is there any other way and thanks max payne

Needs to be done w/Tech2

I never encountered that problem

duramaxdiesel-It has to be off by so much before it will have a mismatch and think something is wrong. Your 36s must be just small enough to not cause it.

Oh cool lucky me! Mine actually measure out to 36.8". Good to know though.

I have had the 37"toyo mts on for about 5,000 miles now and no lights at all???

The lights will only come on with either/or a speedometer recalibration with a programmer or a gear change. A Tech II cannot be used to change this unless your tires are 33" or smaller( the largest size programmed in the system). The problem stems form the front ABS sensor speed versus the output shaft speed in the transmision. When you change the speedometer calibration it will read differently from the front ABS sensors because they haven't been changed.You might want to try Westers,they might have an answer for you.

The lights will only come on with either/or a speedometer recalibration with a programmer or a gear change. A Tech II cannot be used to change this unless your tires are 33" or smaller( the largest size programmed in the system). The problem stems form the front ABS sensor speed versus the output shaft speed in the transmision. When you change the speedometer calibration it will read differently from the front ABS sensors because they haven't been changed.You might want to try Westers,they might have an answer for you.This is why you use a Tech 2 to program the EBCM for the largest size (33"), so they aren't as much of a mismatch. It will stop thowing codes, isn't that the point?

update guys i recallibrated the speedo to 36 inch tire and no lights for the past 2 days