Quick answer
If the warning light stays on after startup, there is usually a stored fault or active problem that should be diagnosed before MOT testing.
Many traction control systems share components with ABS systems.
Why the light matters
Safety system
Helps maintain grip.
Often linked to ABS
Shared sensors are common.
Stored fault codes
Diagnostics often required.
Reduced assistance
Stability aids may be limited.
Wheel sensor issues
Frequent cause of warnings.
Pre-test fix recommended
Avoid surprises at MOT time.
Common causes of traction control light
- 1Wheel speed sensor fault
- 2ABS ring damage
- 3Low battery voltage
- 4Steering angle sensor issue
- 5ABS module fault
How to fix it
Read fault codes first rather than guessing. Many issues can be traced quickly with diagnostics.
Repairing the actual fault is better than only clearing the warning.