how to fix C1201 error code on Toyota Highlander Fourth Generation (2020-present)?

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a level surface and the ignition is off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect Wheel Speed Sensors

• Sub-steps:
  • Raise the vehicle and secure it with jack stands.
  • Remove the wheel to access the brake assembly.
  • Locate the wheel speed sensor and disconnect its electrical connector.
  • Clean the sensor and the mounting area to remove any debris.
  • Reconnect the sensor and reassemble the wheel.

3. Test and Replace Faulty Sensors

• Sub-steps:
  • Use a multimeter to check the resistance of the wheel speed sensor. Compare the reading to the manufacturer’s specifications (typically around 1,000-2,000 ohms).
  • If outside specifications, replace the sensor. To replace:
    • Remove the retaining bolt and carefully pull the sensor out of the hub.
    • Install the new sensor, ensuring it fits securely and the connector is properly attached.

4. Check ABS Module and Wiring

• Sub-steps:
  • Inspect the ABS module for any visible damage or corrosion.
  • Check the wiring harness for continuity using a multimeter.
  • Repair any damaged wires or connectors.
  • If the module is faulty, replace it by removing any mounting bolts and disconnecting the wiring harness.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal after all repairs.
• Use the OBD-II scanner to clear the C1201 code and any other stored codes.
• Perform a test drive to ensure the system functions correctly.