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ABS light after gear swap

pcrow

By pcrow
in Ask A GM Technician

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pcrow Enthusiast

pcrow

Posted
Posted

OK, I give up...this one has me stumped.

 

2003 2wd 4.3V6. Origionally 235's (29") with 3.42 gears. I changed tires to 265's (30.55") wnd re-programmed with Hypertech III...no problems.

 

I have now replaced the gears with 4.10's and reprogrammed again for the gears. Now the ABS and brake lights come on within 5 miles after startup.

 

What gives?

pcrow Enthusiast

pcrow

Posted
  • Author
Posted

Sorry, Acording to the Hypertech, there are none...I have checked multiple times.

 

BTW...shut it off and restart it, and the lights, and DIC message go away for about another 5 miles or so, then re-appear.

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

If the ABS light is on, there's gotta be a code. Well, okay, I suppose in rare instances there may not be, such as if the ABS lost power. I'm guessing this hypertech thingy, whatever it is, just isn't capable enough.

 

If I had to guess, I'd say there's a speed difference between the front wheels and the rear wheels as far as the ABS is concerned.

pcrow Enthusiast

pcrow

Posted
  • Author
Posted

Thanks. 4Wheel Parts (the gear installer) told me to start reducing the tire diameter (as far as what I tell the Hypertech) until the lights stay off. I'm not sure I'm comfortable with that...seems like it will throw off the speedo, shift points, etc.

pcrow Enthusiast

pcrow

Posted
  • Author
Posted

I plan on trying to get the codes read this week, as Hypertech says there are none...

 

I did get rid of the lights though. I told the hypertech about the 4.10's but told it I had 29" tires (actually 30.55 measured by 1 rev on pavement). Speedo is way off...unacceptable.

pcrow Enthusiast

pcrow

Posted
  • Author
Posted

I actually did get the lights to go off...lied to the HP-III and told it I had 29" tires! Speedo is off, so i doubt I will leave it that way.

Update...

 

I called Hypertech this morning. They stated that they have had numerous reports of this...that particular combo yields a diff between the transmission output and wheel sensors that the ABS unit does not like. Hypertech says the only fix is to lie about the tire size (like I am now), or try to get the dealer to re-cal the ABS unit. they report that some dealers will (for a price), and some won't period.

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