how to troubleshoot C1234 error code on Tesla Model 3 Highland (2024-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and set the parking brake.
• Disconnect the negative terminal of the 12V battery for safety.

2. Inspect and Clean Wheel Speed Sensors

• Tools Required: Socket set, cleaning solution, soft brush
• Remove the wheel cover or wheel to access the wheel speed sensor.
• Inspect the sensor for damage; if dirty, clean it using a soft brush and cleaning solution.
• Reinstall the wheel and ensure all components are secure.

3. Test Wheel Speed Sensors

• Tools Required: Multimeter
• Reconnect the battery terminal.
• Use the multimeter to check the resistance of each wheel speed sensor according to manufacturer specifications (typically around 1,000 ohms).
• If any sensor is out of spec, replace it.

4. Check Wiring and Connectors

• Tools Required: Wiring diagram, multimeter
• Visually inspect the wiring and connectors for any signs of fraying, corrosion, or disconnection.
• Use the multimeter to test for continuity and proper voltage at the connectors.
• Repair or replace any damaged wiring or connectors.

5. Reassemble and Clear Codes

• Reconnect the battery terminal.
• Use the OBD-II scanner to clear the C1234 error code.
• Test drive the vehicle to ensure stability control and traction control systems are functioning properly.