how to troubleshoot a dead battery in Tesla Model S Original (2012-2020)

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

540 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to troubleshoot and fix a dead battery issue in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the vehicle's main power supply before working on the battery systems.
•Allow the vehicle to cool down before servicing any components.

Symptoms

•Vehicle will not power on
•Warning messages on the display indicating low battery
•No response from key fob or touchscreen
•Interior lights and displays are unresponsive
•Unable to charge using a standard charger

Diagnostic Steps

1
Check the key fob battery to ensure it is functioning properly.
2
Attempt to power on the vehicle using the key fob or touchscreen.
3
Inspect the 12V battery voltage using a multimeter; it should read approximately 12.6 volts when fully charged.
4
Verify that the high-voltage battery is not entirely depleted by checking the vehicle's charging status via the Tesla app (if accessible).
5
Test the charging cable and outlet for functionality using another device.
6
Review the vehicle's display for any error codes or alerts related to battery issues.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

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

Prevention Tips

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

Tools & Equipment Required

•Multimeter
•Basic hand tools (for battery access)
•Battery charger (if necessary)

Parts Required

•Replacement 12V battery

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Diagnostic Steps

1
Check the key fob battery to ensure it is functioning properly.
2
Attempt to power on the vehicle using the key fob or touchscreen.
3
Inspect the 12V battery voltage using a multimeter; it should read approximately 12.6 volts when fully charged.
4
Verify that the high-voltage battery is not entirely depleted by checking the vehicle's charging status via the Tesla app (if accessible).
5
Test the charging cable and outlet for functionality using another device.
6
Review the vehicle's display for any error codes or alerts related to battery issues.

Solution

1. Preparation

Tools Required: Multimeter, basic hand tools (for battery access), battery charger (if necessary).
Ensure the vehicle is in a safe location and powered off.
Wear safety gloves and goggles.

2. Replace the 12V Battery

Access the 12V Battery:
- Open the front trunk (frunk) of the vehicle.
- Remove the plastic cover to expose the 12V battery.
Disconnect the Battery:
- Use a socket wrench to remove the negative (-) terminal first, followed by the positive (+) terminal.
- Secure the disconnected cables to prevent accidental contact.
Remove the Old Battery:
- Unscrew any mounting brackets holding the 12V battery in place.
- Carefully lift out the old battery.
Install the New Battery:
- Place the new 12V battery into the compartment.
- Reattach the mounting brackets to secure the battery.
Reconnect the Battery:
- Connect the positive (+) terminal first, followed by the negative (-) terminal.
- Ensure connections are tight and secure.

3. Test the Battery System

Power On the Vehicle:
- Attempt to power on the vehicle using the key fob.
- Check if the touchscreen and interior lights respond.
Charge the High-Voltage Battery:
- If the vehicle powers on, connect the vehicle to a charging station to recharge the high-voltage battery.
- Monitor the charging status on the display.