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Engine-Codes – Generic – C1139

C1139 Code - Wheel Speed Sensor Center Tone Ring Missing Tooth Fault

Quick Answer

The C1139 code indicates a Wheel Speed Sensor Center Tone Ring Missing Tooth Fault. Common causes include Physical damage to the tone ring, such as corrosion or impact damage, Incorrect installation of the tone ring, Wear and tear over time causing the teeth to become damaged or missing. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
C1139 indicates Wheel Speed Sensor Center Tone Ring Missing Tooth Fault.
Common causes
Common causes include Physical damage to the tone ring, such as corrosion or impact damage, Incorrect installation of the tone ring, Wear and tear over time causing the teeth to become damaged or missing.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code C1139 Description

The C1139 code indicates a Wheel Speed Sensor Center Tone Ring Missing Tooth Fault. This means that the wheel speed sensor, which is responsible for monitoring the speed of each wheel and transmitting this information to the vehicle's computer system, has detected that there is a missing tooth on the tone ring. The tone ring is a notched ring that is typically located on the CV joint or wheel hub, and it is used to generate a signal that the wheel speed sensor reads to determine the speed of the wheel.

OBDII Code C1139 - Wheel Speed Sensor Center Tone Ring Missing Tooth Fault
C1139 Code - Wheel Speed Sensor Center Tone Ring Missing Tooth Fault

Common Causes of C1139

  1. Physical damage to the tone ring, such as corrosion or impact damage.
  2. Incorrect installation of the tone ring.
  3. Wear and tear over time causing the teeth to become damaged or missing.
  4. Faulty wheel speed sensor.
  5. Electrical issues causing interference with the sensor's readings.

Symptoms of C1139

  1. ABS warning light illuminated on the dashboard.
  2. Traction control light is on.
  3. Vehicle experiences erratic braking behavior.
  4. Increased stopping distance.
  5. Vehicle stability control system malfunctions.

How to Fix C1139

  1. Diagnose the issue by using a scan tool to read the fault code and visually inspect the tone ring for missing teeth.
  2. Replace the tone ring if a tooth is indeed missing. This may involve removing the wheel hub or CV joint to access the tone ring.
  3. Inspect the wheel speed sensor for any damage and replace if necessary.
  4. Clear the fault code from the vehicle's computer system and test drive the vehicle to ensure the issue has been resolved.
  5. Perform a wheel alignment to ensure proper functioning of the ABS and stability control systems.

Cost to Fix C1139

The cost of repairing a Wheel Speed Sensor Center Tone Ring Missing Tooth Fault can vary depending on the make and model of the vehicle, as well as the location of the repair shop. On average, the cost of replacing a tone ring and wheel speed sensor can range from $200 to $500, including parts and labor. Additional costs may apply if other components need to be replaced or if there are complications during the repair process. It is recommended to obtain quotes from reputable auto repair shops in your area to get a more accurate estimate.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1139 Code

1. What are the common symptoms of OBDII code C1139 (Wheel Speed Sensor Center Tone Ring Missing Tooth Fault)?

- Common symptoms include ABS or traction control warning lights illuminated on the dashboard, erratic braking behavior, and potential loss of stability control.

2. What can cause the C1139 code to appear?

- The C1139 code is triggered when the vehicle's wheel speed sensor detects a missing tooth on the center tone ring, which can result from physical damage, corrosion, or wear over time.

3. How can I diagnose the C1139 code?

- Diagnosing the C1139 code typically involves inspecting the wheel speed sensors and the center tone ring for any visible damage or missing teeth. A scan tool can be used to pinpoint the exact location of the fault.

4. Is it safe to drive with the C1139 code present?

- It is not recommended to drive with the C1139 code active, as it can affect the proper functioning of the vehicle's ABS, traction control, and stability control systems, potentially compromising safety.

5. How can I repair the Wheel Speed Sensor Center Tone Ring Missing Tooth Fault?

- Repairing the C1139 code often involves replacing the damaged center tone ring or wheel speed sensor, depending on the extent of the issue. It is crucial to ensure proper installation and calibration for accurate sensor readings.

6. Can I reset the C1139 code without fixing the underlying issue?

- While you can clear the code temporarily, it will likely reappear if the root cause of the missing tooth fault is not addressed. Ignoring the issue can lead to further damage and safety concerns.

7. Are there any preventive measures to avoid the C1139 code in the future?

- Regularly inspecting the wheel speed sensors and center tone rings for signs of wear, corrosion, or damage can help prevent the occurrence of the C1139 fault code. Maintaining proper vehicle care and addressing any issues promptly is key.

8. Can a DIY enthusiast resolve the C1139 code at home?

- Depending on your automotive repair skills and access to tools, you may be able to replace the center tone ring or wheel speed sensor yourself. However, if you are unsure, it is best to seek professional assistance to ensure proper repair.

9. Will the C1139 fault code affect my vehicle's performance?

- The C1139 code may impact the performance of your vehicle's braking and stability control systems, potentially leading to reduced safety and handling. It is essential to address this issue promptly to maintain optimal vehicle performance.

10. How long does it typically take to repair the C1139 code?

- The repair time for the C1139 code can vary depending on the extent of the damage and the accessibility of the affected components. In general, a skilled mechanic can resolve this issue within a few hours to a day.

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