Traction control light on (steady)

Symptoms

• Traction control icon lit continuously
• Car drives normally in dry conditions
• May notice less assistance on wet or slippery roads

Likely causes

• CommonFaulty wheel speed sensorTraction control relies on the same sensors as ABS to detect wheel slip.
• CommonDirty or damaged sensor connectorRoad grime or corrosion can interrupt the signal.
• PossibleSteering angle sensor faultSome systems need this sensor to work correctly and disable traction control if it fails.
• PossibleLow tire pressure or mismatched tiresUneven tire sizes or pressure can confuse the system.
• Less commonABS module faultTraction control usually shares hardware with ABS.

What to do

1. Check all four tire pressures and make sure tires are matched in size and wear.
2. Drive cautiously, especially in rain or snow, since traction assistance may be reduced.
3. Have the code read at a parts store or shop to find which sensor triggered the light.
4. Inspect the flagged wheel speed sensor and connector for dirt, corrosion, or damage.
5. Clean the sensor and connector if grime is the obvious cause, then clear the code.
6. Replace the sensor if cleaning doesn't resolve it.
7. Have a mechanic check the ABS module if sensors all test fine.

Tools and parts

When to call a pro

See a mechanic to diagnose and repair the sensor or module, especially before winter weather.

Safety