how to resolve U0100 code issue on my Tesla Model S Original (2012-2020)

• •Check engine light illuminated
• •Loss of power or performance issues
• •Inconsistent vehicle behavior (e.g., unresponsive throttle)
• •Malfunction of other systems (e.g., HVAC, infotainment)
• •Error messages displayed on dashboard

1. 1Scan the vehicle using an OBD-II scanner to confirm the U0100 code and check for any related codes.
2. 2Inspect wiring and connectors between the ECM and other control modules for damage, corrosion, or loose connections.
3. 3Check the vehicle's battery voltage and health, ensuring it is within the operational range (12.4V - 12.6V when off).
4. 4Perform a visual inspection of the ECM for any signs of physical damage or water intrusion.
5. 5Clear the trouble codes and perform a road test to see if the U0100 code reappears.
6. 6If the code returns, test the communication lines between the ECM and other modules with a multimeter for continuity and 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
• •Wire brush
• •Electrical cleaner

• •ECM (if replacement is necessary)
• •Battery (if faulty)