how to address U0121 communication loss in my Tesla Outback 4th Generation (2010-2014)

• •Illuminated ABS warning light on the dashboard
• •Loss of ABS functionality
• •Erratic speedometer readings
• •Potential loss of traction control functionality
• •Intermittent or complete failure of other electronic systems

1. 1Scan the vehicle's onboard diagnostics using an OBD-II scanner to confirm the presence of the U0121 code and check for any related codes.
2. 2Inspect all wiring and connectors related to the ABS module for signs of damage, corrosion, or loose connections.
3. 3Check the vehicle’s battery health and connections, ensuring that the battery is fully charged and terminals are clean and tight.
4. 4Verify the integrity of the CAN bus system by inspecting for shorts or open circuits.
5. 5Perform a visual inspection of the ABS module and its power supply.
6. 6Test the ABS module with a multimeter to ensure it is receiving proper voltage.

After completing the repair, verify that the issue has been resolved:

• ✓Test the affected component to ensure it functions correctly
• ✓Check for any error codes or warning lights
• ✓Monitor the vehicle for a few days to ensure the issue does not recur

To prevent this issue from occurring again:

• •Follow the manufacturer's recommended maintenance schedule
• •Address warning signs early before they develop into major issues
• •Use quality parts and fluids recommended for your vehicle
• •Keep detailed records of all repairs and maintenance

• •OBD-II scanner
• •Multimeter
• •Socket set
• •Torque wrench
• •Screwdriver set

• •ABS module (if replacement is necessary)
• •Electrical connectors or wiring harness (if damaged)