# What does traction control do? ## Quick answer Traction control is a system that limits wheelspin when you accelerate by cutting engine power or braking the spinning wheel. ## What is Traction control? Traction control helps your tires keep grip when you speed up, especially on rain, snow or gravel. It uses the same wheel speed sensors as the ABS to notice when a drive wheel spins faster than the others. On many cars it can react in a fraction of a second, faster than a driver could ease off the pedal. When that happens, the system reduces engine power, brakes the spinning wheel, or both. Braking one spinning wheel also sends more power across the axle to the wheel with grip, which helps on split surfaces such as one tire on ice. A flashing traction control light while driving usually just means the system is working. Most newer cars also have electronic stability control, which builds on traction control to help keep the car pointed where you are steering. It adds a steering angle sensor and a yaw sensor, which measures how the car is rotating, and can brake individual wheels to correct a skid. Electronic stability control has been required on new US passenger vehicles since the 2012 model year. A steady light can mean the system is off or has a fault. Because traction control shares parts with the ABS, a wheel speed sensor problem often turns on both lights. Mismatched tires or a very low tire can also confuse the system. ## How it works 1. Wheel speed sensors report how fast each wheel is turning. 2. The computer sees when a driven wheel spins faster than the others. 3. It lowers engine power and may lightly brake the spinning wheel. 4. Once the wheel grips again, normal power returns. ## Types of Traction control | Type | What it is | | --- | --- | | Engine-based traction control | Cuts power by closing the throttle, retarding spark timing or reducing fuel to stop wheelspin. | | Brake-based traction control | Applies the brake on the spinning wheel, which also sends power to the wheel with more grip. | | Electronic stability control (ESC) | Builds on traction control with steering and yaw sensors to brake individual wheels and correct skids. | | Off and sport modes | Many cars let you switch traction control off or relax it, often with a button marked with a skidding-car symbol. | ## Common Traction control problems - A faulty or dirty wheel speed sensor that turns on both the traction control and ABS lights. - Damaged sensor wiring or a cracked tone ring near a wheel. - A steering angle sensor that needs calibration, often after an alignment. - Mismatched tire sizes or a low tire that makes one wheel spin at a different speed. - Engine faults that turn off traction control along with the check engine light on some cars. ## Frequently asked questions ### Why is my traction control light flashing? A flashing light usually means the system is working because a wheel started to slip, often on wet, icy or loose roads. Ease off the gas and drive gently for the conditions. If it flashes often on dry pavement, have the tires and wheel speed sensors checked. ### Is it safe to drive with the traction control light on? Usually yes, but the system may not help if you lose grip. Check that it was not switched off by the button, then have a steady light checked soon. Drive more carefully in rain and snow, and if the ABS or red brake light is also on, get the brakes inspected promptly. ### When should I turn traction control off? Turning it off can help when you are stuck in snow, mud or sand and need some wheelspin to get moving. Turn it back on once you are moving again. Leave it on for normal driving, because it helps prevent wheelspin and loss of control on slippery roads. ### What is the difference between traction control and stability control? Traction control stops the drive wheels from spinning when you accelerate. Stability control goes further, using steering and yaw sensors to detect a skid and brake individual wheels to keep the car going where you steer. Most newer cars have both, sharing the same sensors. ### What causes the traction control light to stay on? Common causes are a faulty wheel speed sensor, damaged sensor wiring, a steering angle sensor problem or the system being switched off. Some cars also disable traction control when the check engine light is on. A scan tool that reads ABS and chassis codes can find the cause. ### Does traction control help in snow? It helps you get moving and reduces wheelspin, which can make it easier to pull away on snow. It does not add grip or shorten stopping distances. Winter tires and slower speeds matter much more for safe driving in snow and ice. ### Why do my traction control and ABS lights come on together? Both systems share wheel speed sensors and usually the same control module, so one fault often turns on both lights. A bad wheel speed sensor, damaged wiring or low brake fluid are common causes. Your normal brakes should still work, but have it checked soon. ### Does traction control hurt performance? On dry roads, it rarely gets in the way during normal driving. In hard acceleration or track use, it can cut power to limit wheelspin, which some drivers find intrusive. Many performance cars offer a sport mode that allows more slip while keeping some protection. ### How much does it cost to fix traction control? It depends on the cause. A wheel speed sensor is often a fairly modest repair, while a steering angle sensor calibration, ABS module or wiring repair can cost more. Have the codes read first so you pay for the right repair, and check for recalls. ### Can bad tires affect traction control? Yes. Mismatched tire sizes, very uneven tread or a low tire can make one wheel turn at a different speed, which the system may read as slipping. That can trigger the light or cause the system to cut power unexpectedly. Keep tires matched and properly inflated. ## Sources - [Car Care Council: Car care guide](https://www.carcare.org/car-care-guide/) ## Related terms - [ABS](https://diagxcar.com/glossary/abs) - [All-wheel drive](https://diagxcar.com/glossary/all-wheel-drive) - [Torque](https://diagxcar.com/glossary/torque) ## Related pages - [Traction control light](https://diagxcar.com/warning-lights/traction-control) - [ABS warning light](https://diagxcar.com/warning-lights/abs) --- Source page: https://diagxcar.com/glossary/traction-control Updated: 2026-11-03 General information, not a substitute for a qualified mechanic.