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

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

533 words

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 solutions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always ensure the vehicle is turned off before performing any electrical checks or modifications.

Symptoms

•Battery percentage drops significantly overnight
•"Battery not charging" alerts upon startup
•Extended charging times when reconnected to a power source
•Inability to use certain features due to low battery
•Increased energy consumption readings in the vehicle's energy display

Diagnostic Steps

1
Check for any active alerts or notifications on the vehicle's display regarding battery health or energy consumption.
2
Use the Tesla app to monitor battery usage statistics over a 24-hour period to identify unusual drains.
3
Inspect the vehicle's settings for "Always Connected" features that may be consuming battery power.
4
Check for any third-party applications or devices connected to the vehicle that may be causing battery drain.
5
Perform a software update to ensure the vehicle's firmware is current.
6
Utilize an OBD-II scanner to check for error codes related to the battery management system.

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
•OBD-II scanner
•Tesla charging cable

Parts Required

•None required unless battery replacement is needed based on health assessment.

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Diagnostic Steps

1
Check for any active alerts or notifications on the vehicle's display regarding battery health or energy consumption.
2
Use the Tesla app to monitor battery usage statistics over a 24-hour period to identify unusual drains.
3
Inspect the vehicle's settings for "Always Connected" features that may be consuming battery power.
4
Check for any third-party applications or devices connected to the vehicle that may be causing battery drain.
5
Perform a software update to ensure the vehicle's firmware is current.
6
Utilize an OBD-II scanner to check for error codes related to the battery management system.

Solution

1. Preparation

Gather necessary tools and equipment, including a multimeter, OBD-II scanner, and Tesla charging cable.
Ensure the vehicle is in a safe location with ample space for work.
Disconnect the vehicle from the charging station.

2. Inspect Battery Health

Sub-steps:
1. Access the service menu via the vehicle’s touchscreen.
2. Navigate to "Battery" settings and review the "Battery Health" status.
3. Check the voltage and current readings using a multimeter to assess battery condition.
Tools Required: Multimeter

3. Modify Settings

Sub-steps:
1. In the Tesla settings, go to "Energy" and then "Settings."
2. Disable features like "Always Connected" or "Sentry Mode" if they are not needed.
3. Set the "Scheduled Departure" to optimize battery use based on your daily schedule.
Tools Required: None, adjustments made via touchscreen.

4. Update Software

Sub-steps:
1. Check for available software updates on the Tesla touchscreen.
2. If an update is available, follow the prompts to download and install it.
3. Confirm that the update was successful by checking the version number.
Tools Required: None

5. Check for External Draws

Sub-steps:
1. Disconnect any third-party devices or apps linked to the vehicle.
2. Monitor battery usage over the next 24 hours to identify any change in drainage.
Tools Required: None