2004 Buick LesabreMarch 23, 2015Is the ABS and TC sensor one and the same? Keywords:Lesabre 6 thoughts on “2004 Buick Lesabre” Freeautomechanic March 24, 2015 at 8:53 am There are several ABS sensors. each wheel has a hub bearing that has internal speed sensors inside them. The transmission also has a VSS – Vehicle Speed Sensor. Not sure what you mean by TC Sensor.. what does “TC” stand for? John Erwin March 26, 2015 at 7:19 pm TC is Traction Control. What I see is the ABS light on the dash as well as the TRACTION CONTROL OFF. Neither will go off. John Erwin March 30, 2015 at 7:23 pm The gear shift lever has a button similar to the overdrive button. With this button you can turn Traction Control off. It operates when hydroplaning situations and such. You can turn Traction Control Off if stuck in mud or snow. The problem I have is the Traction Control is off (indicated by the “Traction Control Off” light on the dash. I cannot turn it on, which would make the light go off. Freeautomechanic March 31, 2015 at 10:47 am The vehicle does use the same speed sensors to assist the ABS and Traction Control System. If there is an error in the ABS system the Traction control is automatically disabled. The ABS Issue will have to be corrected in order for the feature to work. Most likely one of your Hub Bearings is worn and causing the internal speed sensor to fail. John Erwin March 31, 2015 at 7:19 pm Thank you very much. That is as I suspected. There is a very slight noise indicating a hub bearing. Now to figure out what side it is coming from. By the way, I have 4 wheel ABS. Traction Control should only be relative to the front drive wheels, correct? Can a faulty rear ABS make the Traction Control turn off? Freeautomechanic March 31, 2015 at 7:28 pm The Rear should not cause it as much as the front. But if any part of the ABS fails, it will disable the Traction Control. How to Diagnose the Noise Comments are closed.