C1139 – OBD-II DTC

OBD-II DTC C1139 – Wheel Speed Sensor Center Tone Ring Missing Tooth Fault

DTC C1139 meaning

DTC C1139 refers to a diagnostic trouble code indicating a “Wheel Speed Sensor Center Tone Ring Missing Tooth Fault.” This code is triggered when the vehicle’s onboard diagnostic system detects an issue with the tone ring associated with the wheel speed sensor. The tone ring is a critical component that helps the vehicle’s anti-lock braking system (ABS) and traction control system (TCS) monitor wheel speed. A missing tooth on the tone ring can lead to inaccurate readings, affecting vehicle stability and safety systems.

DTC C1139 symptoms

Common symptoms associated with DTC C1139 may include:

• Illumination of the ABS warning light on the dashboard
• Inconsistent or erratic ABS operation
• Traction control system (TCS) warning light activation
• Loss of ABS functionality
• Potential loss of vehicle stability during braking

DTC C1139 causes

Several factors can lead to the triggering of DTC C1139, including:

• Physical damage to the tone ring, such as cracks or missing teeth
• Corrosion or debris buildup on the tone ring or sensor
• Faulty wheel speed sensor
• Wiring issues, such as frayed or damaged wires
• Improper installation of the tone ring

DTC C1139 seriousness

DTC C1139 is considered a serious issue as it directly impacts the vehicle’s braking and stability control systems. If left unaddressed, it can lead to:

• Increased risk of skidding or loss of control during braking
• Potential for accidents due to compromised braking performance
• Failure of the vehicle to pass safety inspections

How to diagnose DTC C1139

To diagnose DTC C1139, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC C1139.
2. Inspect the tone ring for visible damage, such as missing teeth or cracks.
3. Check the wheel speed sensor for proper operation and alignment.
4. Examine the wiring and connectors for signs of wear or damage.
5. Clear the code and perform a test drive to see if the code reappears.

How to fix DTC C1139 step-by-step instructions

To fix DTC C1139, follow these steps:

1. Identify and replace the damaged tone ring if missing teeth or cracks are found.
2. Clean any debris or corrosion from the tone ring and wheel speed sensor.
3. Replace the wheel speed sensor if it is found to be faulty.
4. Repair or replace any damaged wiring or connectors associated with the sensor.
5. Reinstall the tone ring and ensure it is properly aligned.
6. Clear the DTC using an OBD-II scanner and perform a test drive to verify the fix.

How to erase DTC C1139

To erase DTC C1139, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the vehicle’s ignition without starting the engine.
3. Access the diagnostic menu on the scanner and select the option to clear or erase trouble codes.
4. Confirm the action and wait for the scanner to complete the process.
5. Disconnect the scanner and start the vehicle to ensure the code does not reappear.

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