Traction Control Explained

By: the Editors of Publications International, Ltd.  | 
Image Gallery: Trucks Traction control systems limit power to the drive wheels to prevent wheel spin under acceleration. See pictures of trucks.
photo courtesy of Chevrolet

Traction control helps limit tire slip in acceleration on slippery surfaces. In the past, drivers had to feather the gas pedal to prevent the drive wheels from spinning wildly on slippery pavement. Many of today's vehicles employ electronic controls to limit power delivery for the driver, eliminating wheel slip and helping the driver accelerate under control.

Powerful rear-drive cars from the sixties often had a primitive form of traction control called a limited slip rear differential. Sometimes referred to as Positraction, a limited-slip rear axle will mechanically transfer power to the rear wheel with the most traction, helping to reduce, but not eliminate wheel spin. While limited-slip rear axles are still in use in many front- and rear-drive vehicles today, the device can't completely eliminate wheel slip. Hence, a more sophisticated system was needed. 


Enter electronic traction control. In modern vehicles, traction-control systems utilize the same wheel-speed sensors employed by the antilock braking system. These sensors measure differences in rotational speed to determine if the wheels that are receiving power have lost traction. When the traction-control system determines that one wheel is spinning more quickly than the others, it automatically "pumps" the brake to that wheel to reduce its speed and lessen wheel slip. In most cases, individual wheel braking is enough to control wheel slip. However, some traction-control systems also reduce engine power to the slipping wheels. On a few of these vehicles, drivers may sense pulsations of the gas pedal when the system is reducing engine power much like a brake pedal pulsates when the antilock braking system is working.

Many people mistakenly believe that traction control will prevent their vehicle from getting stuck in the snow. This couldn't be further from the truth. Traction control does not have the ability to increase traction; it just attempts to prevent a vehicle's wheels from spinning. For drivers who routinely drive in snowy and icy conditions, traction control, antilock brakes, and snow tires are must-have safety features.


Traction Control FAQ

Should I drive with traction control on or off?
Traction control should be turned on while driving. Regardless of your driving skills, the system is in place to prevent accidents and should not be turned off.
When should I turn off traction control?
Seeing as traction control is used to prevent vehicles from skidding, it is an important safety feature. It needs to be turned off, however, when the car is stuck in snow or mud and not able to move.
How do I turn my traction control back on?
This can be done by pressing the same button you used to turn off traction control.
Does traction control come on automatically?
This varies from vehicle to vehicle. It is automatically switched on when the car starts, and can be switched off at the push of a button (which needs to stay pressed for a few seconds). Alternately, the same can be done by tapping the relevant command on the display in your car.
Should you turn traction control off on ice?
Traction control will keep your car from slipping and skidding on ice. If it is stuck in snow and hence stationary, spinning the tires is only going to cause more problems.