how to fix my Tesla Model S Original (2012-2020) if the battery drains overnight

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

528 words

Problem Statement

Learn how to diagnose and fix excessive battery drain overnight in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and solutions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is parked in a well-ventilated area while charging.
•Do not attempt to access or service battery components without proper training and tools.

Symptoms

•Battery percentage drops significantly overnight
•"Battery Management System" warning displayed
•Unresponsive or slow touchscreen interface
•Increased energy consumption readings in the app
•Possible phantom drain indicated by energy logs

Diagnostic Steps

1
Check the current battery state of charge using the vehicle's touchscreen or mobile app.
2
Access the energy usage screen to review recent energy consumption patterns.
3
Inspect the vehicle logs via the Tesla app or online account for any abnormal activity or excessive energy draw.
4
Verify if any third-party applications or features (like Sentry Mode) are enabled that could contribute to battery drain.
5
Perform a software update if an update is available to ensure the vehicle’s battery management system is current.
6
Check for any alerts or notifications relating to battery health or charging 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

•Mobile device for Tesla app
•Laptop for software updates
•Charging cable

Parts Required

•None specifically required, unless battery replacement is deemed necessary after diagnostics.

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Diagnostic Steps

1
Check the current battery state of charge using the vehicle's touchscreen or mobile app.
2
Access the energy usage screen to review recent energy consumption patterns.
3
Inspect the vehicle logs via the Tesla app or online account for any abnormal activity or excessive energy draw.
4
Verify if any third-party applications or features (like Sentry Mode) are enabled that could contribute to battery drain.
5
Perform a software update if an update is available to ensure the vehicle’s battery management system is current.
6
Check for any alerts or notifications relating to battery health or charging issues.

Solution

1. Preparation

Gather tools: mobile device for Tesla app, laptop for software updates, and a charging cable.
Ensure the vehicle is parked and locked, with no active sessions on the mobile app.

2. Disable Unnecessary Features

Open the Tesla app and navigate to ‘Settings’.
Turn off Sentry Mode and any other features that may be keeping the vehicle awake (e.g., Cabin Overheat Protection).
Confirm the changes and monitor any changes in battery drain.

3. Perform a Battery Health Check

Connect the vehicle to a Tesla Supercharger or home charging station.
Allow the vehicle to charge fully to 100%.
Navigate to the ‘Battery’ section in the settings to check for any battery health notifications.
If needed, contact Tesla support for further diagnostics if the battery health appears degraded.

4. Update Software

Ensure the vehicle is connected to Wi-Fi and check for updates in the ‘Software’ section of the settings.
If an update is available, initiate the download and follow the prompts to complete the installation.
After the update, restart the vehicle by holding down the two scroll buttons on the steering wheel until the screen resets.