how to troubleshoot my Tesla Model 3 Highland (2024-present) that won't start

Solution

1. Preparation

• Tools Required: None specific for initial checks.
• Ensure the vehicle is parked in a safe area with adequate space for repairs.
• Have a charged key fob or key card ready for possible entry.

2. Check Key Fob and Manual Entry

• Sub-steps:
  1. Replace the battery in the key fob if unresponsive.
  2. Use the physical key card to manually unlock the vehicle.
  3. If the vehicle responds, proceed to check the software and battery status.

3. Inspect the 12V Battery

• Sub-steps:
  1. Open the front trunk to access the 12V battery.
  2. Inspect battery terminals for corrosion or loose connections.
  3. Use a multimeter to measure the voltage of the 12V battery. It should be above 12.4 volts.
  4. If the battery is low, jump-start it or replace it if necessary.

4. Charge the Main Battery

• Sub-steps:
  1. Connect the vehicle to a Tesla Supercharger or home charging station.
  2. Monitor the charging status on the touchscreen or via the Tesla app.
  3. Wait until the battery reaches a sufficient level for starting (above 20%).

5. Reset the Vehicle

• Sub-steps:
  1. With the vehicle in a safe position, perform a hard reset by holding both scroll wheels on the steering wheel until the touchscreen reboots.
  2. Wait for the touchscreen to come back online and check for functionality.