how to resolve C1234 code in Tesla Outback 4th Generation (2010-2014)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety while working on the electrical systems.

2. Inspect and Clean Wheel Speed Sensors

• Tools Required: Ratchet and socket set, cleaning solution, soft brush.
• Locate each wheel speed sensor on the wheel hub assembly.
• Remove the sensor using the ratchet and socket.
• Clean the sensor and its mounting area with the cleaning solution and soft brush to remove any debris.
• Reinstall the sensor securely.

3. Check Wiring and Connectors

• Tools Required: Multimeter, wiring diagram.
• Visually inspect the wiring harnesses connected to the wheel speed sensors and ABS control module for any damage or corrosion.
• Use the multimeter to test for continuity in the wiring. Repair or replace any damaged wires as necessary.

4. Test Wheel Speed Sensor Operation

• Tools Required: Multimeter, vehicle scan tool.
• Reconnect the battery and start the vehicle.
• Using the multimeter, measure the output voltage of each wheel speed sensor while the vehicle is in motion.
• Compare readings with the manufacturer specifications; replace any sensors that are not functioning correctly.

5. Reset ABS Control Module

• Tools Required: Vehicle scan tool.
• After repairs, use the scan tool to clear the C1234 code from the ABS control module.
• Perform a test drive to ensure that the ABS system is functioning properly and that the warning lights have not returned.