What does the traction control light mean?
The traction control light usually illuminates briefly when the system activates during acceleration on a slippery surface — this is normal. If the light stays on permanently, the traction control system has been deactivated or has a fault. A common cause is a faulty wheel speed sensor (shared with ABS). If both ABS and traction control lights are on together, a wheel speed sensor fault is very likely.
Likely causes
Normal system activation (briefly on)
Flashing during acceleration on wet or loose surfaces is normal — the system is working
Faulty wheel speed sensor
Same sensor shared with ABS — both lights often come on together
System manually disabled
Some cars have a TC off button — check if it was accidentally pressed
Steering angle sensor fault
Less common — affects ESP/stability control specifically
Repairs you may need
Typical cost range: £60–£250 — If just a wheel speed sensor: £80–200. Diagnostic scan to confirm: £40–80.
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