my Tesla Model S Original (2012-2020) battery drains too fast when parked what can I do

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

495 words

Problem Statement

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

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Ensure the vehicle is in 'Park' mode while performing diagnostics.

Symptoms

•Significant battery percentage loss overnight while parked
•Warning messages about battery level or charging
•Reduced driving range when the vehicle is in use
•Increased frequency of charging sessions
•Possible overheating of the battery pack

Diagnostic Steps

1
Check the battery health status via the onboard diagnostics.
2
Use the Tesla mobile app to monitor energy consumption and background processes.
3
Review any recent software updates that may affect battery management.
4
Inspect for third-party devices connected to the vehicle (e.g., dash cams).
5
Conduct a parasitic draw test to identify abnormal power consumption.
6
Verify that all systems are fully asleep after the vehicle is parked.

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 mobile app

Parts Required

•Replacement battery (if degraded)

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Diagnostic Steps

1
Check the battery health status via the onboard diagnostics.
2
Use the Tesla mobile app to monitor energy consumption and background processes.
3
Review any recent software updates that may affect battery management.
4
Inspect for third-party devices connected to the vehicle (e.g., dash cams).
5
Conduct a parasitic draw test to identify abnormal power consumption.
6
Verify that all systems are fully asleep after the vehicle is parked.

Solution

1. Preparation

Ensure the vehicle is parked safely and on a flat surface.
Gather necessary tools and equipment.
Disconnect any third-party devices from the vehicle.

2. Battery Health Check

Access the touchscreen and navigate to "Settings" > "Battery" > "Battery Health."
Note the current state of the battery; if the health is below 70%, consider battery replacement.

3. Update Software

Connect the vehicle to Wi-Fi.
Go to "Software" in the settings and check for updates.
Install any available updates to improve battery management features.

4. Check for Parasitic Draw

Use a multimeter to measure the current draw from the battery when the vehicle is parked.
Disconnect the negative battery terminal and connect the multimeter in series to measure the draw.
If the draw exceeds 50mA, identify circuits causing excessive drain by removing fuses one-by-one.

5. Reconfigure Settings

Navigate to "Settings" > "Energy" > "Energy Saving" and enable features to minimize battery drain while parked.
Turn off features such as "Always Connected" if not necessary.

6. Battery Maintenance

If the battery is aging, consider a battery health check by a Tesla service center.
Schedule a service appointment if the battery health is significantly degraded or if issues persist.