What Does This Error Mean?

Ford traction control or AdvanceTrac warning light means the stability system has detected a fault. The most common cause is a wheel speed sensor fault — the same sensor used by ABS. If the ABS light is also on, check the ABS system first.

Affected Models

Ford F-150
Ford Escape
Ford Focus
Ford Explorer
Ford Mustang
Ford Edge
Ford Ranger
Ford Transit

Common Causes

Wheel speed sensor failed — traction control uses the same sensors as ABS; a failed sensor disables both systems
Steering angle sensor fault — traction control compares steering input to vehicle direction
Yaw rate sensor fault
ABS module fault disabling both ABS and stability control
Traction control manually switched off — a button press accidentally disabling it

How to Fix It

Check if traction control was manually turned off.

Ford AdvanceTrac can be disabled with the traction control button (usually labeled TCS or shows a car with skid lines). If it was accidentally pressed, the light illuminates and the system is off. Press the button again to re-enable traction control — the light should go out.
Check if the ABS light is also on.

Traction control and ABS share wheel speed sensors — a failed sensor disables both systems and lights both warning lights simultaneously. If both the ABS and traction control lights are on, the fix is almost always a wheel speed sensor. Read the fault code to confirm which wheel's sensor has failed.
Read the fault code.

Connect an OBD-II scanner and read chassis (C-prefix) codes. Common Ford stability system codes: C1145 (right front wheel speed sensor), C1155 (left front), U0121 (communication fault with ABS module). The code tells you exactly which sensor or module to replace.
Check for road conditions that trigger normal activation.

The traction control light may flash (not stay on) when the system is actively working — on snow, gravel, or wet roads, this is normal. A light that flashes momentarily on a slippery surface and then goes out indicates the system is working correctly. Only a light that stays on permanently indicates a fault requiring diagnosis.
Inspect the steering angle sensor.

The steering angle sensor measures how far the steering wheel is turned. After a wheel alignment or if the battery was disconnected, the steering angle sensor may lose its calibration, triggering the AdvanceTrac warning. The sensor can be recalibrated with an OBD-II scanner that supports Ford ABS/stability system resets.

When to Call a Professional

Persistent AdvanceTrac and ABS warnings together indicate a wheel speed sensor or ABS module issue. Have the fault code read to confirm the specific component.