Traction control- Active came on and limited acceleration to 120. Turned off the control and unlimited speed was available. Any ideas of the cause?

Recently had the car aligned and replaced the front tires.

 

What is the DIC displaying for your tire pressures?

You say "Traction control- Active" came on, but are you sure it wasn't an indication that the Active Handling was active?

You say you "Turned off the control" - what control??? Were you able to go into Comp mode or turn AH off completely?

If you're talking about the TC/AH button on the console, one push of the button turns off TC, and a second push of the button puts the AH into the Comp mode. If you push and hold the button down for about 10 seconds you'll see a message in the DIC that TC and AH are both off. (In Comp mode AH is still on but won't intervene as quickly; with AH off completely there is no help from it at all).

If your tire pressure sensors were messed up when your new tires were installed, that could very well be the cause of an "Service Monitor Message". When the TPMS doesn't get signals from your tire pressure sensors you can turn off TC, but you can't go into Comp mode or turn AH off completely. During agressive maneuvering with no tire pressure sensors, or sensors that aren't properly programmed into the TPMS, the AH will pull power to protect the car from what it thinks are tires with low pressure.

So.....if your tire shop messed up your sensors when putting on your new tires, that may be the cause of what you experienced.

Bob

 

I think you have something here. The front tires are showing in the DIC but the rears are not.

 

Swapping L/R rims would not do anything except give you reversed readings.

It's just a bumpy road. There is a lot of torque to maintain that speed and if there are rolling bumps TC will kick in. I notice the same thing on the back straight at Spring Mountain unless TC/AH is off.

-pp

 

If you installed larger tires on the front you could have this problem. The EBCM expects to see a certain ratio of wheel speeds between the front and rear wheels due to the larger diameter rear tires. If you reduced this ratio by going with larger diameter front tires that could very well be your problem. The EBCM thinks you are spinning the rear tires and will cut throttle and apply the rear brakes. A lot of C5/C6 owners have been messed up by not watching the tire diameters on replacement tires.

Bill

 

And the solutions to your problem are;

Replace the front tires with tires with the correct diameter.

Or replace your rear tires with the same % oversize as the front replacements.

 

All this is good info but tire size is same as stock. I do have different brands on front and rear. Guess I need to take it in and see what codes come up. All the TPMS are working. I was wondering about the shocks since I have the select ride. I had it out this weekend and still have the same issue.

 

Same size as stock? Unless the tires are the same brand and model they are not the same size as stock. There is no standard for reporting sizes on tires. The manufacturers list the tire in whatever size they want to list it. A 245/40/18 from one maker can be 1/2 inch different diameter and the same difference in width than a 245/40/18 from another brand but since nobody actually measures the tire size all brands "calculate" as being the same diameter and width for the same stated size.

 

Thanks for posting that, I had never done more than turn off traction control and assumed that active handling was not able to be turned off. Glad to now know what all I can change with the button over a year after getting the car!

 

Very true! Experienced this last week while racing on a private airstrip. At 120mph I'd hit a section of the road and TC/AH would come on killing the power to my car. Car would still go just not at full power.