what does it mean if my Toyota Highlander XU70 (2020-Present) has a C1201 code?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety during repairs.
• Allow the vehicle to cool if recently driven.

2. Inspect and Clean ABS Wheel Speed Sensors

• Locate the ABS wheel speed sensors at each wheel hub.
• Remove any dirt or debris from the sensor area using a clean cloth.
• If sensors are damaged, replace them with new ones. (Tool: socket set for removal)

3. Check Brake Fluid Levels

• Open the hood and locate the brake fluid reservoir.
• Inspect the brake fluid level; if low, top off with the appropriate brake fluid type (DOT 3 or DOT 4 as specified in the owner’s manual).
• Check for any visible leaks in the brake lines or connections.

4. Test ABS Control Module

• Reconnect the battery terminal.
• Use a multimeter to check the voltage and ground at the ABS module connector.
• If voltages are outside the specified range, consider replacing the ABS control module.

5. Clear Codes and Test Drive

• Use the OBD-II scanner to clear the C1201 code from the ECU.
• Perform a test drive to see if the code reappears and to confirm proper ABS function.