why is my Tesla Model 3 Highland (2024-present) ABS light on

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, brake cleaner, torque wrench
• Disconnect the vehicle's 12V battery to ensure safety while working on electrical components.
• Allow the vehicle to cool down if it has been recently driven.

2. Inspect and Clean ABS Wheel Speed Sensors

• Sub-steps:
  1. Raise the vehicle and secure it on jack stands.
  2. Remove the wheel to access the wheel speed sensor.
  3. Disconnect the sensor's electrical connector.
  4. Clean the sensor and mounting area with brake cleaner to remove dirt or debris.
  5. Reconnect the sensor and secure it in place.

3. Check Brake Fluid Level

• Sub-steps:
  1. Locate the master cylinder reservoir under the hood.
  2. Check the fluid level; if low, add the manufacturer-recommended brake fluid type.
  3. Reattach the reservoir cap securely.

4. Inspect Wiring and Connectors

• Sub-steps:
  1. Visually inspect wiring harnesses leading to ABS sensors for fraying or damage.
  2. Ensure all connectors are tight and free of corrosion.
  3. Repair or replace any damaged wiring or connectors as necessary.

5. Test ABS Control Module

• Sub-steps:
  1. Use the OBD-II scanner to access the ABS control module data.
  2. Check for any fault codes; follow the scanner's recommendations for repairs.
  3. If the module is faulty, it will need to be replaced and reprogrammed as per manufacturer specifications.

6. Reconnect Battery and Clear Codes

• Reconnect the vehicle's 12V battery.
• Use the OBD-II scanner to clear any fault codes from the ABS system.
• Perform a test drive to ensure the ABS light does not re-illuminate.