how to diagnose a battery issue in my Tesla Model 3 Highland (2024-present)

Solution

1. Preparation

• Ensure the vehicle is parked in a safe location and powered off.
• Gather necessary tools and parts.
• Disconnect the vehicle from any charging source.

2. Inspect Battery Connections

• Tools Required: Wrench set, wire brush
• Carefully remove the battery terminal covers if applicable.
• Inspect and clean the positive and negative battery terminals using a wire brush to remove any corrosion.
• Ensure connections are tight and secure; reconnect terminals if they were removed.

3. Replace Battery (if necessary)

• Tools Required: Socket set, torque wrench, battery puller
• Parts Required: New battery compatible with Tesla Model 3 Highland
• Disconnect the negative terminal first, followed by the positive terminal.
• Remove any retaining brackets or supports holding the battery in place.
• Carefully lift the battery out using a battery puller.
• Install the new battery in reverse order: position the new battery, secure it with brackets, and connect the positive terminal first, followed by the negative terminal.
• Torque terminal connections to manufacturer specifications (usually around 10-15 ft-lbs).

4. Software Reset

• With the vehicle powered on, perform a software reset by holding down both scroll wheels on the steering wheel until the screen reboots.
• Check for any updates that may address battery management issues.

5. Test and Charge Battery

• Connect the vehicle to a charger and monitor the charging process via the dashboard or Tesla app.
• Ensure the battery accepts charge and reaches a full state without issues.