how to fix C1201 code on Toyota Highlander Third Generation (2014-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is on a level surface and secure it with wheel chocks.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace ABS Wheel Speed Sensors

• Tools Required: Socket set, torque wrench, multimeter
• Sub-steps:
  1. Locate the ABS wheel speed sensors at each wheel hub.
  2. Remove the mounting bolts using a socket set, then carefully pull the sensor out from the hub.
  3. Test the sensor with a multimeter for proper resistance (typically between 1,000 to 2,000 ohms).
  4. If the sensor is out of specification, replace it with a new sensor.
  5. Reinstall the sensor and torque the mounting bolts to the manufacturer’s specification (typically around 7-10 ft-lbs).

3. Inspect and Repair ABS Module Wiring

• Tools Required: Wire strippers, soldering iron, electrical tape
• Sub-steps:
  1. Trace the wiring from the ABS module to the wheel speed sensors.
  2. Look for frayed wires, exposed connections, or corrosion at connectors.
  3. Repair any damaged wiring by stripping back the insulation and soldering new wire as needed. Use electrical tape to secure the repairs.
  4. Ensure all connectors are tight and free of corrosion.

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals and ensure they are tight.
• Use the OBD-II scanner to clear the C1201 code from the system.

5. Test Drive

• Perform a test drive to confirm that the ABS system is functioning properly and that the C1201 code does not return.