Symptom
Traction control light stays on
The skidding-car symbol, and the distinction that matters is between flashing and steady. Flashing while you drive is the system working exactly as intended — it is telling you a wheel is losing grip and that the car is intervening, which is normal on a wet roundabout or a loose surface and needs nothing done about it. Staying on steadily is the opposite message: traction control is either switched off at the dashboard button, or has faulted and shut itself down. A car with it disabled drives normally until the moment it would have been needed, which is why a steady lamp is worth attending to before winter rather than after.
Also described as: traction control light, tcs light, skidding car light, traction light on, car with squiggly lines, چراغ کنترل کشش روشن میماند, چراغ تراکشن, luz control traccion, testigo traccion encendido, luz asr encendida, لمبة التحكم بالجر, علامة نظام السحب, إشارة التماسك مضيئة
What this usually means
Flashing and steady are opposite messages, and this is the whole diagnosis for most of these complaints. Flashing while driving is the system working exactly as intended — telling you a wheel is losing grip and that the car is intervening. That is normal on a wet roundabout or a loose surface and needs nothing done about it.
Staying on steadily is the opposite: traction control is either switched off at the dashboard button, or it has faulted and shut itself down. A car with it disabled drives completely normally until the moment it would have been needed, which is why a steady lamp is worth attending to before winter rather than after.
Check the button first. It is free, and a switch pressed accidentally — or one that has failed closed — accounts for a good share of steady lamps with nothing wrong.
When it has genuinely faulted, the cause is usually shared with the anti-lock system, because traction control uses the same wheel speed sensors and the same hydraulic unit. So a steady traction lamp alongside an ABS lamp is one sensor, not two faults. A steady traction lamp on its own more often points at the switch, at the module's own configuration, or at wheel speeds that disagree for a legitimate reason — a space-saver spare, or tyres worn very unevenly across the axles.
Working through it
| What you find | Likely cause | How to confirm it | What fixes it |
|---|---|---|---|
| Flashes briefly while driving on a wet or loose surface | Nothing — the system is intervening, which is what it is for | Note that it flashes rather than staying lit, and that it coincides with low grip. | No repair. Frequent flashing on dry roads points at tyres or alignment rather than at the system. |
| Steady, and the dashboard button may have been pressed | Switched off — deliberately or by a failed switch | Press the button and watch. If nothing changes, read the switch's live state. | Renew the switch where it has failed. Free check and it resolves a large share of these. |
| Steady, alongside the ABS lamp | A shared wheel speed sensor — one fault, two lamps | Read the code for the named corner and compare all four wheel speeds live while rolling. | Renew the sensor or repair the harness, checking the reluctor ring before fitting. |
| Steady after fitting a space-saver spare or mismatched tyres | Wheel speeds that legitimately disagree because rolling radii differ | Check tyre sizes and wear across all four corners. | Fit a matching wheel and tyre. Not a fault, and it clears once the speeds agree. |
| Steady with no codes and no button pressed | Module configuration, or a system disabled in software after other work | Read the module's coding and compare against the vehicle's specification. | Restore the correct coding. This turns up after control unit replacement or retrofitting. |
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Flashes briefly while driving on a wet or loose surface
- Likely cause
- Nothing — the system is intervening, which is what it is for
- How to confirm it
- Note that it flashes rather than staying lit, and that it coincides with low grip.
- What fixes it
- No repair. Frequent flashing on dry roads points at tyres or alignment rather than at the system.
-
Steady, and the dashboard button may have been pressed
- Likely cause
- Switched off — deliberately or by a failed switch
- How to confirm it
- Press the button and watch. If nothing changes, read the switch's live state.
- What fixes it
- Renew the switch where it has failed. Free check and it resolves a large share of these.
-
Steady, alongside the ABS lamp
- Likely cause
- A shared wheel speed sensor — one fault, two lamps
- How to confirm it
- Read the code for the named corner and compare all four wheel speeds live while rolling.
- What fixes it
- Renew the sensor or repair the harness, checking the reluctor ring before fitting.
-
Steady after fitting a space-saver spare or mismatched tyres
- Likely cause
- Wheel speeds that legitimately disagree because rolling radii differ
- How to confirm it
- Check tyre sizes and wear across all four corners.
- What fixes it
- Fit a matching wheel and tyre. Not a fault, and it clears once the speeds agree.
-
Steady with no codes and no button pressed
- Likely cause
- Module configuration, or a system disabled in software after other work
- How to confirm it
- Read the module's coding and compare against the vehicle's specification.
- What fixes it
- Restore the correct coding. This turns up after control unit replacement or retrofitting.
Codes that produce this symptom (3)
Listed with the codes that most typically present this way first — the likeliest place to start.
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
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- The car — make, model, year and engine. The same fault behaves differently on each.
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