Short answer
A traction or stability control light that flashes while you drive means the system is working: a wheel is slipping and the car is cutting power or braking a wheel to keep grip. A steady light means the system is switched off or has a fault. Either way you can keep driving, gently.
- Also shown as:
- TCS light · ESC / ESP light · VSC light · Stability control light · Car with squiggly lines light
- What it looks like:
- A car with two wavy skid lines behind it; the word OFF is added when the system is switched off.
Is it safe to keep driving?
Yes. A flashing light is the system doing its job. A steady light means you have no traction assistance, so drive as you would in a car without it.
What causes the traction control / stability light?
Most common first. Symbols and meanings vary by manufacturer; your owner's manual has the definitive meaning for your model.
- Slippery road (flashing — normal). Rain, ice, snow, gravel or a hard launch makes a wheel spin. The light flashes while the system brakes that wheel or trims power.
- System switched off. The traction or stability button was pressed, often by accident. Many cars switch it back on at the next start.
- Wheel speed sensor fault. Traction control shares the ABS wheel sensors. If the ABS light is on too, a sensor or its wiring is the usual cause.
- Engine fault. Many cars switch traction control off when the check engine light is on, because they cannot control engine power reliably. Fix the engine fault and the light goes out.
- Steering angle sensor not calibrated. After an alignment, steering work or a battery disconnection, some cars need the steering angle sensor recalibrated before stability control will run.
- Mismatched or under-inflated tires. Tires of different sizes, or one badly under-inflated tire, turn at different speeds and can look like wheelspin to the system.
What should you do right now?
- If it flashes, ease off the accelerator and smooth out your steering and braking — the road is slippery.
- If it stays on, check whether the traction control button was pressed, and restart the car.
- Look for company: with the ABS light, suspect a wheel sensor; with the check engine light, deal with the engine fault first.
- Check that the tire pressures are right and all four tires are the same size.
- If it stays on, have the chassis codes read.
What does the fix usually involve?
The stored code says which input the system has lost. Typical repairs are a wheel speed sensor or its wiring, a steering angle sensor calibration with a scan tool, or fixing the engine fault the system is reacting to.
If the cause is tires, matching the sizes or correcting the pressures is the whole fix.
How much does it cost to fix?
$0 – $400
Free if it is just switched off; a wheel speed sensor at the high end.
A typical range, not a quote. Actual cost depends on the car, the shop and the fault.
Common questions
Should I turn traction control off in snow?
Generally leave it on. The exception many owner's manuals mention is being stuck in deep snow, mud or sand, where letting the wheels spin can help rock the car free. Switch it back on once you are moving.
Why does the traction control light come on with the check engine light?
Many cars disable traction control whenever there is an engine fault, because they can no longer trust their control of engine power. Have the engine code read; once that fault is fixed the traction light usually goes out too.
Is stability control the same as traction control?
They are related. Traction control stops wheelspin when you accelerate. Electronic stability control (ESC) brakes individual wheels to stop a skid or spin in a corner. ESC has been required on new US passenger vehicles since the 2012 model year.
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