what does the C1234 code mean on my Tesla Model 3 Highland (2024-present)?

Solution

1. Preparation

• Gather necessary tools: OBD-II scanner, multimeter, socket set, and a torque wrench.
• Ensure the vehicle is on a flat surface and engage the parking brake.
• Disconnect the vehicle's battery to prevent any electrical shorts.

2. Inspect Wheel Speed Sensors

• Sub-steps:
  1. Raise the vehicle using a jack and secure it on jack stands.
  2. Remove the wheel to access the wheel speed sensor.
  3. Disconnect the wheel speed sensor connector and inspect for damage.
  4. Clean any debris from the sensor and the mounting area.
  5. Reconnect the sensor and torque the connector to specifications.

3. Test Wheel Speed Sensor Voltage

• Sub-steps:
  1. Reconnect the battery and turn the ignition to the "ON" position without starting the engine.
  2. Use a multimeter to measure the output voltage of the wheel speed sensor.
  3. Confirm that the voltage readings are within the manufacturer's specifications, typically around 0.5 to 2 volts AC.
  4. If readings are outside specifications, replace the wheel speed sensor.

4. Inspect Wiring and Connectors

• Sub-steps:
  1. Visually inspect the wiring harness for any signs of wear, fraying, or corrosion.
  2. Tighten any loose connections and repair damaged wires as necessary.
  3. Ensure that all connectors are seated properly and free of dirt and debris.

5. Reprogram or Update ABS Control Module

• Sub-steps:
  1. Using the OBD-II scanner, check for any available software updates for the ABS control module.
  2. Follow the scanner prompts to update the software if necessary.
  3. Clear all error codes and reset the ABS system.