C1231 – OBD-II DTC

OBD-II DTC C1231 – Speed Wheel Sensor Rear Center Circuit Open

DTC C1231 meaning

DTC C1231 refers to a diagnostic trouble code indicating an open circuit in the rear center speed wheel sensor. This sensor is crucial for the vehicle’s anti-lock braking system (ABS) and traction control system, as it monitors the speed of the wheels to ensure proper operation of these systems. An open circuit means that there is a break in the electrical connection, preventing the sensor from sending accurate data to the vehicle’s control module.

DTC C1231 symptoms

Common symptoms associated with DTC C1231 may include:

• Illumination of the ABS warning light on the dashboard
• Decreased effectiveness of the ABS system
• Traction control system malfunctions
• Unusual braking behavior, such as locking up during hard stops
• Inconsistent wheel speed readings

DTC C1231 causes

Several factors can lead to the occurrence of DTC C1231, including:

• Faulty rear center speed wheel sensor
• Damaged wiring or connectors in the sensor circuit
• Corrosion or poor connections at the sensor or control module
• Issues with the vehicle’s ABS control module
• Mechanical problems affecting the wheel or hub assembly

DTC C1231 seriousness

DTC C1231 is considered a serious issue as it directly impacts the vehicle’s braking and stability control systems. If left unaddressed, it can lead to compromised safety while driving, especially in slippery or emergency conditions. It is advisable to diagnose and repair this issue promptly to ensure the vehicle operates safely.

How to diagnose DTC C1231

To diagnose DTC C1231, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the C1231 code.
2. Inspect the rear center speed wheel sensor and its wiring for visible damage or disconnections.
3. Check the sensor’s resistance and voltage using a multimeter to ensure it is functioning correctly.
4. Examine the ABS control module for any additional codes or issues.
5. Test the continuity of the wiring between the sensor and the control module.

How to fix DTC C1231 step-by-step instructions

To fix DTC C1231, follow these steps:

1. Disconnect the vehicle’s battery to ensure safety while working on the electrical system.
2. Inspect and repair any damaged wiring or connectors related to the rear center speed wheel sensor.
3. If the sensor is faulty, replace it with a new one.
4. Reconnect all connectors and ensure they are secure and free of corrosion.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Test drive the vehicle to ensure the ABS and traction control systems are functioning properly.

How to erase DTC C1231

To erase DTC C1231, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the option to clear or erase trouble codes on the scanner.
4. Confirm the action to erase the codes.
5. Disconnect the scanner and turn off the ignition.
6. Start the vehicle and check if the DTC reappears after a test drive.

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