Skip the auto shop - Our mechanics make house calls

Q: Traction Control System light always on

asked by on

It's already been a week that the TCS light of my car keeps coming on always, even when I try to switch it off. I've experienced few times, especially when the road is wet or when I come to a complete stop, and when I slowly accelerate it, that the wheels spin and sometimes the car sways during turning. I had the car checked and scanned and the mechanic suggested to replace the brake fluid master cylinder because there was a leak according to him. But I can't see any leak outside the cylinder. Is this leak why the TCS light is on? My car has 233458 miles.
My car has an automatic transmission.

A: Hi, thanks for writing in. Your car is equi...

Hi, thanks for writing in. Your car is equipped with wheel speed sensors at each of the four wheels which monitor wheel speed while relaying this information constantly to the ABS and traction control system which are controlled by the car's ECU. When the ECU senses an abnormal speed given specific conditions, it engages the ABS or traction control as needed to control the vehicle properly and safely. Occasionally, these sensors can fail or become faulty working intermittently sending inaccurate signals to the ECU. When this happens, you may experience the symptoms you have described. The ABS or traction control system may be inadvertently activated by these false or inaccurate signals. If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this service light for you, and make or suggest any repairs as needed.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: How does the ceiling light work?

Your Accord features a number of convenience lights designed to make it easier to see inside your car in low-light situations. The ceiling light (also called a dome light) is one of these. It has three settings here: On...

Q: Overdrive stuck on OFF

Hello. The button itself might be damaged. Every switch and button accessible to the driver will have a way of being serviced. It's just a matter of what panels or access points you have to get into in order to...

Q: No tire pressure sensor, disappointing

The tire pressure sensor light alerts you when a tire has low pressure. When you get your tire fixed, the light goes out. This is how it's supposed function when everything is working properly. When the system malfunctions, you may...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...