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Abs Light/tall Tires/cant Reprogram

jetjky

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jetjky New Member

jetjky

Posted
Posted

2007 Z71, 6" lift, 35" tires. I get an ABS light when I reprogram with 35" tires. Reprogram it back to 31"(factory size) and the light will stay off but the speedo is off. Ordered this truck from the factory before they hit the showrooms. Superchips guru says only a handful of these were made and their programmer will not work..return it for a refund. Tried Ultrachip and got the same result. Diablo said to try theirs but wasnt sure it would work. Anyone else have this problem? Any suggestions?

iminaquagmire Enthusiast

iminaquagmire

Posted
Posted

I have the same problem once I go above 45 for a while. Justin from Blackbear told me that its an issue with the front speed sensors sensing a different speed than the rears because the recalibration is not the same as a factory calibration. The more you mess with how the sensors work, the more likely the problem will arise. Mine happened after I had my gears installed. After talking to the dealer, they said there was nothing they could do because there is no factory calibration to be programmed if the tire size never came on a vehicle from the factory. i would be very interested if anybody else has found a solution.

ChevyTech77 Senior Enthusiast

ChevyTech77

Posted
Posted

The ecm, tcm and ebcm all have to be programmed for the same size tires and/or gear changes. If not, you get a mis-match between the modules and a C0245 will set turning on the abs lights. If you have stability control (RPO JL4), you will always have weird things happening because stability control systems don't like it when you change the handling of the vehicle from stock (lifted/lowered/large tire size changes) because there is no way to change that part of the programming. All crew cab 1/2 ton trucks had JL4 standard from '07 and up.

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