what does C1234 error code indicate for my Tesla Model 3 Highland (2024-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and engage the parking brake.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect ABS Wheel Speed Sensors

• Locate the wheel speed sensors at each wheel hub.
• Disconnect the sensor wiring harness.
• Remove the sensor from its mounting location.
• Clean the sensor and mounting area to remove dirt and debris.
• Reinstall the sensor and reconnect the wiring harness.

3. Check Wiring and Connectors

• Visually inspect wiring leading to the ABS module for fraying or damage.
• Ensure all connectors are clean, tight, and free from corrosion.
• Repair any damaged wiring or replace connectors as necessary.

4. Verify Brake Fluid Condition

• Locate the brake fluid reservoir and check the fluid level.
• If fluid is low, fill it with the recommended brake fluid type (usually DOT 3 or DOT 4).
• If the fluid is contaminated (dark or cloudy), perform a brake fluid flush.

5. Test ABS Module and Pump

• Reconnect the battery terminal.
• Use a diagnostic tool to activate the ABS pump and check for proper operation.
• Monitor for any error codes during the test and ensure no faults are present after the operation.