why does my Tesla Model S Original (2012-2020) battery die when parked

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

537 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 diagnose and fix battery drain issues in Tesla Model S (2012-2020). Step-by-step guide with symptoms, diagnostic steps, and solutions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the high-voltage battery before performing any electrical work.
•Allow the vehicle to cool down before inspecting components.

Symptoms

•Battery drains significantly when the vehicle is not in use.
•Battery Low warning message on the dashboard.
•Inability to start the vehicle after extended parking.
•Reduced range when the vehicle is ready to drive.
•High vampire drain (power loss during sleep mode).

Diagnostic Steps

1
Use an OBD-II scanner to check for any error codes related to the battery or energy management system.
2
Inspect the battery management system (BMS) settings for any anomalies.
3
Check for energy consumption settings in the vehicle's software (e.g., Sentry Mode, Cabin Overheat Protection).
4
Measure the parasitic draw using a multimeter with the vehicle in sleep mode.
5
Verify software updates are installed to ensure optimal energy management.
6
Inspect the 12V battery for health and connections, as it can affect the main battery's performance.

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

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

Parts Required

•12V battery (if replacement is needed)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Use an OBD-II scanner to check for any error codes related to the battery or energy management system.
2
Inspect the battery management system (BMS) settings for any anomalies.
3
Check for energy consumption settings in the vehicle's software (e.g., Sentry Mode, Cabin Overheat Protection).
4
Measure the parasitic draw using a multimeter with the vehicle in sleep mode.
5
Verify software updates are installed to ensure optimal energy management.
6
Inspect the 12V battery for health and connections, as it can affect the main battery's performance.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked safely and on a level surface.
Disconnect the high-voltage battery by using the service mode (if applicable) for safety.

2. Inspect and Test the 12V Battery

Sub-steps:
- Remove the frunk cover to access the 12V battery.
- Inspect the battery terminals for corrosion or loose connections.
- Use a multimeter to check the voltage of the 12V battery. It should read above 12.4 volts.
- If the voltage is low, consider replacing the 12V battery.

Tools Required:

Multimeter
Socket set
Torque wrench (for battery terminal connections)

3. Adjust Energy Settings

Sub-steps:
- Access the vehicle settings on the touchscreen.
- Navigate to the "Energy" settings menu.
- Disable or adjust Sentry Mode and Cabin Overheat Protection if they are not needed.
- Monitor energy consumption settings and adjust as necessary.

4. Update Software

Sub-steps:
- Connect the vehicle to Wi-Fi.
- Check for available software updates in the settings menu.
- Follow prompts to download and install updates.

5. Monitor Battery Health

Sub-steps:
- Check the battery health status through the Tesla app or vehicle display.
- If the battery shows significantly reduced capacity, consider scheduling service for battery evaluation.