HELP!!
I have a 2008 Chevy Suburban 1500 LT, Lifted 6 inches with 35 inch Toyo AT2 Tires.
Here's the problem. When braking and turning at the same time my ABS activates and the Traction Control light flashes. I had been told by numerous people to replace the ABS Sensor in the Wheel assembly.
I just had both front wheel hub assemblies replaced at with a $600.00 bill. This fixed nothing! Now it actually seems worse, I purchased the upgraded Federal Mogal Hub assemblies and installed them.

What am I missing? I here this is a really common problem on the 07-09 Tahoe's and Suburban's.

Has anybody else had this issue? I cant keep throwing money at this truck to solve what should be a really easy fix. No Codes and the Mechanic says it the Tire size?!?!?! Don't think so, as the tire size shouldn't affect the ABS or Traction control. These tires aren't much bigger than stock.

Any help would be great.

Thanks,
Frustrated Chevy Owner

 

How new are the brakes? Doesn't the traction control work by manipulating the brakes? Parking brake?

 

Tire size doesn't matter, but...

Equal diameter does.
Why don't you do a circumference check on all four Tires.
Make sure there is equal pressure in each Tire, and each is up off of the Ground when you measure it.
Do it in the center line of the Tires, and use a soft/cloth Measuring Tape(s).

 

Maybe the 35 inch tires are the problem. ABS senses the difference in tire rotation, during a turn the outer tire rotates faster than the inner tire. With large tires this difference may be enough to activate the ABS. Put the standard tires on for a quick test to see if this idea is correct.

 

ABS senses when one or more wheels are almost stopped and releases that wheel(s) brake. As SWHouston said, as long as they're the same diameter, you shouldn't have a problem w/ tire size.

I believe Traction Control uses throttle control and maybe brake control.

 

Bruce,
ABS, AWD and 4WD don't care what diameter Tires are used. Only that they are the same. That's why I ask the OP to do a measurement, because even if the Stamped Numbers/size on the Tire are the same, there could be sufficient wear on tires that large, to make enough difference to cause a problem.

I'm hoping he'll come back with some numbers we can evaluate.

IOW:
If the OP put a (1) New Tire on with a fairly used Set, that may be enough to throw a kink into the comparator.
Also:
It's not good to mix Brands either. Though they may say they are the same (like a 265/70R/18) there can be enough difference in the Molds between companies, which could cause this as well.

 

Thanks for all the advice. The tires are all brand new (4 weeks old now) Toyo All Terrain AT'2 and are all matching in size and diameter.
Since changing the Wheel hub assemblies on both front axles, the problem now has gotten worse. Now instead of just having an issue on turns we are now experiencing a loud noise at start up and during the first 50 - 100 feet of travel. I live in an area where Chevy Dealers are not close by, so I haven't had the chance to get it in yet. Our local mechanics have seen many issues with the Chevy AVS / Traction Control Issues. They are finding all kinds of small things that lead to the problem.

One thing noted by one Mechanic was the truck sits on the large tires and he's not confident that the tires are aligned properly with the right angle on each tire. He noticed the little nubs on the driverside have not wore off the same as the passenger side. if you looked at the tread of the tire the driver side still had the little rubber nubs from the factory even after a couple hundred miles of driving on pavement, the passenger side all wore off evenly across the entire tread of the tire. Could this be the problem? Sounds to simple but probably should do the alignment anyway!

After reading the above comments on this post and also reading about the Chevy Traction Control issues, It does appear as though Chevy has a big problem that they are not standing behind. One fear is that the ABS system is inferior and was not engineered to fit the vehicle in its full capacity of weight distribution and stopping ability under tight or emergency turns (The whole point of ABS is to prevent accidents not create them)
Also noticed that the ABS system or Traction Control is controlled by numerous other factors, ie. Throttle, braking, turning, road conditions, and much more. this makes the diagnostics a lot more difficult, especially since there are never any codes in the computer parked or while driving?!?!

I live in an area where dirt and gravel roads are common place, This Suburban is extremely dangerous off pavement! We have been unable to drive it now for about 3 weeks safely, We recently bought it to take the family on some summer vacations and have been thoroughly disappointed with our new Sub, We had our last Suburban for over 12 years and put over 200,000 miles on it with little more than one transmission replacement. before this we had a 98 Chevy Sub that we loved and got almost 150,000 on that before trading it in. So far our new Suburban has around 70,000 miles on it and the Dash has the famous cracks in it, the chrome door handles are flaking apart, the back lift gate is too heavy for the factory supports and wont stay up, the ABS system is faulty and the interior cloth and carpet is less than good quality. What happened to the days of good quality Chevy products? a $40,000.00 dollar SUV should not have any of these issues at only 70,000 miles!
I had one Mechanic say this is the price you pay for buying a vehicle from a company who was almost Bankrupt the same year of the birth of your truck, he noted that GM had been "Outsourcing" products for cheaper quality to save money, and with the government restrictions on MPG and Air quality put way to many extra things into the vehicle that are only inhibiting its performance and drive ability. When I changed the front Hub assemblies the parts store asked if I wanted the OEM "Chinese built" or to upgrade to the Made in the USA Federal Mogal hubs, chose to spend $200.00 more to buy American! Also noticed a very big difference in quality between the 2 when setting side by side on the table. Why can't one of the worlds largest (American owned) auto companies do the same? I have owned more than 15 Chevy trucks in the last 25 years, both for home and work and the newer ones are nothing like the old well built trucks we all loved to drive.

Thanks again for all the advice, I read each one and check the vehicle each time. I'll be taking the truck to the Dealer in about a week and not to excited about the $180.00 Diagnostics fee, but if it solves my problem it will be worth every penny to have a safe family car again. Didn't mean to go off on a tangent but the last two vehicles I have bought are both lemons and starting to get pissed having car payments and Auto repair bills on 2 new to me trucks.

 

I am new here, but not so new to Chevys and their peculiarities. Yours in particular is a problem that is shared with my 07 Burb. I have seen the issue on more than one truck. Sometimes it turns out to be the EBCM, but mostly what I have found is a poor wiring connection at the EBCM. That connector is under the truck, unprotected from the elements and it takes a beating. If you can get the codes out of the ABS system, I would be happy to help you locate the source of your trouble.