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

medium

Severity

3 min read

580 words

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 12V battery before working on electrical systems
•Ensure the vehicle is turned off before performing any tests

Symptoms

•Battery drains significantly when parked for several days
•Cabin overheat protection may not activate
•Reduced range indicated on the dashboard
•Frequent alerts about low battery charge
•Difficulty starting or powering on the vehicle after parking

Diagnostic Steps

1
Check Battery Health: Use the Tesla app to check the battery health and state of charge
2
Inspect Settings: Review the vehicle's settings for features that may contribute to battery drain, such as 'Always Connected' or 'Cabin Overheat Protection'
3
Review Energy Usage: Access the energy consumption report in the vehicle's settings to identify any abnormal patterns
4
Perform a Parasitic Draw Test: Use a multimeter to measure the current draw from the battery while the vehicle is off
5
Check for Software Updates: Ensure the vehicle's software is up to date, as updates can fix bugs related to battery management
6
Inspect for Faulty Components: Look for any signs of malfunctioning components, such as the 12V battery or any aftermarket devices that may be draining power

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
•Tesla app
•Laptop for software updates

Parts Required

•Replacement 12V battery

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Diagnostic Steps

1
Check Battery Health: Use the Tesla app to check the battery health and state of charge
2
Inspect Settings: Review the vehicle's settings for features that may contribute to battery drain, such as 'Always Connected' or 'Cabin Overheat Protection'
3
Review Energy Usage: Access the energy consumption report in the vehicle's settings to identify any abnormal patterns
4
Perform a Parasitic Draw Test: Use a multimeter to measure the current draw from the battery while the vehicle is off
5
Check for Software Updates: Ensure the vehicle's software is up to date, as updates can fix bugs related to battery management
6
Inspect for Faulty Components: Look for any signs of malfunctioning components, such as the 12V battery or any aftermarket devices that may be draining power

Solution

1. Preparation

Tools Required: Multimeter, Tesla app, laptop for software updates (optional).
Ensure the vehicle is parked in a safe location with adequate space to work.
Disconnect the 12V battery before performing any electrical inspections.

2. Address Settings

Sub-steps:
1. Access the vehicle's touchscreen.
2. Navigate to 'Settings' > 'Safety & Security.'
3. Disable features like "Always Connected" and adjust "Cabin Overheat Protection" to a lower setting.

3. Battery Health and Updates

Sub-steps:
1. Use the Tesla app to check the battery health status.
2. If the battery health is below 80%, consider contacting Tesla for a battery evaluation.
3. Connect the vehicle to Wi-Fi and check for available software updates. Install any updates found.

4. Parasitic Draw Test

Sub-steps:
1. After ensuring the vehicle is powered off, connect the multimeter in series with the battery to measure the current draw.
2. Ensure the reading is within the normal range (typically under 50 mA).
3. If the reading is high, disconnect fuses one by one to identify the circuit causing excess draw.

5. Inspect and Replace Components

Sub-steps:
1. Inspect the 12V battery, looking for signs of corrosion or wear.
2. Replace the 12V battery if it shows signs of failure or is older than 3-4 years.
3. Check any aftermarket devices for proper installation and functionality; remove if necessary.