A traction control or stability control light that flashes briefly, then goes out, is completely normal — it means the system just intervened to stop a wheel spinning, exactly as designed. A light that comes on and stays solid means the opposite: the system has detected a fault and disabled itself. The same short list of causes behind the ABS light is usually responsible, since both systems share the same wheel speed sensors.
Flashing Is the System Working
Traction control and electronic stability control both intervene automatically when a wheel loses grip — reducing engine power, applying a touch of brake to an individual wheel, or both, to help the car regain traction. The dashboard light flashes for the duration of that intervention as a way of telling you it is happening, then switches off once grip is restored.
Recognise normal flashing by: it happens on wet roads, gravel, snow, ice, or during hard acceleration from a standstill — situations where a wheel spinning briefly is expected — and it stops flashing within a second or two once the car is moving cleanly again.
If your traction control light is flashing more than you would like, that usually says more about road conditions or driving style than about the car. Easing off the accelerator on a wet or loose surface reduces how often it intervenes.
Steady Means the System Has Disabled Itself
A traction or stability control light that comes on and stays on, rather than flashing and clearing, means the module has detected a fault it cannot work around and has switched the system off as a precaution — similar to how the ABS light behaves when its own faults occur.
This is not a coincidence: traction control and stability control both rely on the same wheel speed sensor data that ABS uses, so a fault affecting one very often affects all three simultaneously. If your traction control light is on steady alongside the ABS light, they very likely share the exact same root cause.
Common Causes of a Steady Light
- A faulty wheel speed sensor. By far the most common cause — a sensor contaminated with brake dust, corroded, or damaged, exactly as covered in our ABS light and C0035 guides.
- Damaged sensor wiring or a corroded connector. The same wiring that feeds ABS feeds traction and stability control.
- A low brake fluid level. Because these systems can apply individual brakes, they depend on the hydraulic system having proper pressure.
- A faulty steering angle sensor, on cars with full stability control, which also uses steering angle to judge whether the car’s actual path matches what the driver intended.
- A manually disabled system. Many cars have a traction control off button — check that it has not been pressed accidentally, since some cars keep the light on solid whenever the system is deliberately switched off.
- Low tyre pressure or a significant tyre size mismatch (for example, a different-size spare fitted), which can confuse the wheel speed comparison the system relies on.
How to Check It Yourself
1. Check whether it was switched off deliberately
Look for a traction control button, usually marked with a car-and-wavy-lines icon, and confirm it has not been pressed. Some cars require holding it for several seconds to fully disable the system, and a light left on after that is expected, not a fault.
2. Check tyre pressures, including the spare
Uneven pressures, or a significantly different-size wheel fitted temporarily, can trigger this.
3. Scan for codes
The same diagnostic process used for the ABS light applies here — a stored code naming a specific wheel sensor sends you straight to that corner.
Never work under a vehicle supported only by a jack. Use axle stands on firm, level ground, chock the wheels that stay down, and leave the car in gear or Park with the handbrake on. A jack lifts; stands hold.
Can You Keep Driving?
If the light is flashing during normal driving on a wet or loose surface, yes — that is the system working exactly as intended, and no action is needed. If it is on steady, driving is still possible, but you have lost the extra stability and traction assistance these systems provide, particularly valuable in poor weather or during an emergency manoeuvre. Have it checked reasonably promptly rather than leaving it indefinitely.
When to See a Mechanic
Book it in if the light stays on steady, especially alongside the ABS light — that combination points at a shared sensor or wiring fault worth diagnosing properly. Not an emergency, but worth resolving before relying on the car in wet or wintry conditions where these systems matter most. More in our dashboard warning lights section and our full ABS light guide, which covers the shared diagnostic process in detail.
Frequently Asked Questions
Is it normal for the traction control light to flash while driving?
Yes, briefly — it flashes whenever the system intervenes to stop a wheel spinning, commonly on wet, icy or loose surfaces. It should go out within a second or two once grip is restored.
What does it mean if the traction control light stays on?
The system has detected a fault and disabled itself, most often a wheel speed sensor issue — the same root cause that commonly triggers the ABS light, since both systems share the same sensors.
Can I turn traction control off on purpose?
Yes, most cars have a button for this, sometimes useful in snow or mud where wheel spin actually helps momentum. Some cars keep the dashboard light on solid the whole time it is deliberately disabled.
Is it safe to drive with the traction control light on steady?
Yes, the car drives normally, but you lose the extra stability assistance these systems provide — most valuable in poor weather or an emergency manoeuvre. Worth getting checked reasonably soon.
Why are my ABS and traction control lights on together?
They share the same wheel speed sensors, so a single fault — usually a dirty or damaged sensor — commonly disables both systems at once and lights both warnings simultaneously.
