C1139: Wheel Speed Sensor Center Tone Ring Missing Tooth Fault
What does C1139 mean?
C1139 is a diagnostic trouble code indicating "Wheel Speed Sensor Center Tone Ring Missing Tooth Fault". A sensor in the wheel speed sensors is reporting abnormal data or has lost communication with the ECU. Sensors can fail due to age, contamination, heat exposure, or wiring issues.
Symptoms you may notice
- Check engine light (MIL) illuminated on dashboard
- Intermittent warning lights
- Erratic gauge readings
Estimated repair cost
Typical range in Australia (parts + labour)
Common causes
- Faulty wheel speed sensors component
- Wiring or connector issue in the related circuit
- Failed sensor providing incorrect readings
- Software/calibration issue requiring ECU update
- Related component causing secondary fault
What should you do?
This code sits in the stability and traction control system. Electronic stability control, traction control and the sensors feeding them may be offline, so the car will not correct a slide for you. It will feel completely normal right up until you need it, typically in the wet or in a sudden swerve. Get it diagnosed before driving in poor conditions.
Get a diagnosis for YOUR car
Code C1139 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.