how to fix C1234 code for my Tesla Model 3 Highland (2024-present) ABS issue?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the vehicle's 12V battery to ensure safety during repairs.
• Ensure the vehicle is on a level surface and securely supported.

2. Inspect Wheel Speed Sensors

• Locate the ABS wheel speed sensors at each wheel hub.
• Remove any protective covers if necessary.
• Disconnect the electrical connectors from the sensors.
• Visually inspect the sensors for dirt, damage, or disconnection.
• Clean the sensors with a soft brush and brake cleaner if dirty.

3. Test and Replace Wheel Speed Sensors (if faulty)

• Using a multimeter, measure the resistance across the sensor terminals. Compare with manufacturer specifications.
• If the readings are outside the specified range, replace the faulty sensor:
  • Remove the sensor from the wheel hub.
  • Install the new sensor and secure it in place.
  • Reconnect the electrical connector.

4. Inspect and Repair ABS Control Module

• Access the ABS control module, typically located near the brake master cylinder.
• Check for any corrosion or damage at the connector terminals.
• Clean any corrosion with a suitable electrical contact cleaner.
• If the module is damaged, replace it:
  • Disconnect the battery again if not already done.
  • Remove the module mounting bolts and disconnect the wiring harness.
  • Install the new ABS control module and secure it.

5. Reconnect and Test

• Reconnect the 12V battery.
• Clear the C1234 code using the OBD-II scanner.
• Test drive the vehicle to ensure proper ABS functionality and monitor for warning lights.