C1229 – OBD-II DTC

OBD-II DTC C1229 – Speed Wheel Sensor Rear Center Coherency Fault

DTC C1229 meaning

DTC C1229 refers to a “Speed Wheel Sensor Rear Center Coherency Fault.” This diagnostic trouble code indicates that the vehicle’s onboard diagnostic system has detected a discrepancy in the signals received from the rear center wheel speed sensor. The system expects the signals from all wheel speed sensors to be coherent and consistent with each other, and any irregularity can trigger this code.

DTC C1229 symptoms

Common symptoms associated with DTC C1229 may include:

• Illumination of the check engine light or ABS warning light
• Inconsistent or erratic ABS operation
• Loss of traction control functionality
• Unusual braking behavior, such as locking up or skidding
• Increased stopping distances

DTC C1229 causes

Several factors can lead to the triggering of DTC C1229, including:

• Faulty rear center wheel speed sensor
• Wiring issues, such as damaged or corroded connectors
• Faulty ABS control module
• Incorrectly installed or misaligned wheel speed sensors
• Mechanical issues with the rear axle or wheel assembly

DTC C1229 seriousness

DTC C1229 is considered a serious issue as it can affect the vehicle’s braking system and overall safety. The ABS and traction control systems may not function correctly, increasing the risk of accidents, especially in adverse driving conditions. It is essential to address this code promptly to ensure safe vehicle operation.

How to diagnose DTC C1229

To diagnose DTC C1229, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the C1229 code.
2. Inspect the rear center wheel speed sensor and its wiring for any visible damage or corrosion.
3. Check the sensor’s electrical connections to ensure they are secure and free of debris.
4. Test the wheel speed sensor’s output using a multimeter to verify it is functioning within specifications.
5. Examine the ABS control module for any fault codes or issues.
6. Perform a road test to observe the behavior of the ABS and traction control systems.

How to fix DTC C1229 step-by-step instructions

To fix DTC C1229, follow these step-by-step instructions:

1. Begin by addressing any wiring issues. Repair or replace damaged wires and connectors.
2. If the rear center wheel speed sensor is faulty, replace it with a new one.
3. Ensure that the new sensor is installed correctly and aligned properly.
4. Clear any fault codes using an OBD-II scanner.
5. Perform a road test to confirm that the ABS and traction control systems are functioning correctly.
6. If the code reappears, further diagnose the ABS control module and other related components.

How to erase DTC C1229

To erase DTC C1229, 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. Access the scanner’s menu 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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