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

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

508 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 diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the 12V battery before working on electrical components.
•Allow the vehicle to cool before accessing the battery.

Symptoms

•Battery drains rapidly when parked for several days
•Vehicle fails to start or shows low battery warning upon return
•Increased battery management system (BMS) notifications
•Reduced range displayed on the dashboard prior to parking
•Potential issues with 12V battery (if applicable)

Diagnostic Steps

1
Check for any active notifications or alerts on the vehicle's display.
2
Use the Tesla mobile app to monitor battery status and energy consumption over time.
3
Inspect for any aftermarket accessories that might draw power when the vehicle is off.
4
Verify software version and check for any available updates from Tesla.
5
Perform a deep dive into energy consumption logs through the vehicle's settings.
6
Assess the health of the 12V battery with the Tesla service menu or a multimeter.

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
•Socket set
•Tesla mobile app

Parts Required

•12V battery (if replacement is necessary)

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Diagnostic Steps

1
Check for any active notifications or alerts on the vehicle's display.
2
Use the Tesla mobile app to monitor battery status and energy consumption over time.
3
Inspect for any aftermarket accessories that might draw power when the vehicle is off.
4
Verify software version and check for any available updates from Tesla.
5
Perform a deep dive into energy consumption logs through the vehicle's settings.
6
Assess the health of the 12V battery with the Tesla service menu or a multimeter.

Solution

1. Preparation

Ensure the vehicle is parked safely in a well-ventilated area.
Disconnect any aftermarket accessories that may draw power.
Gather necessary tools: multimeter, Tesla mobile app.

2. Update Software

Navigate to the vehicle's settings and check for software updates.
If an update is available, connect the vehicle to Wi-Fi and commence the update.
Confirm the update is successful before proceeding.

3. Inspect and Replace 12V Battery (if necessary)

Tools Required: Socket set, multimeter
Sub-steps:
1. Open the front trunk (frunk) and locate the 12V battery.
2. Disconnect the negative terminal first, followed by the positive terminal.
3. Remove the battery hold-down bracket and carefully lift out the battery.
4. Using a multimeter, check the voltage of the old battery. Replace if below 12.4 volts.
5. Install the new 12V battery by reversing the removal steps.
6. Reconnect the positive terminal first, followed by the negative terminal.

4. Perform Battery Maintenance

Tools Required: None
Sub-steps:
1. Ensure that the vehicle is set to "Energy Saving" mode in the settings.
2. Schedule a "Battery Calibration" if the vehicle's system suggests it.
3. Regularly check the state of charge when parked for extended periods.