my Tesla Model S Original (2012-2020) is draining battery while parked, what to check

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

535 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 repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent short circuits or electric shock.
•Allow the vehicle to cool down before inspecting or working on any components.

Symptoms

•Battery drains significantly while the vehicle is parked
•"Battery Management System" warning on the dashboard
•Increased frequency of charging required
•Vehicle not waking up from sleep mode
•Reduced range displayed on the instrument panel

Diagnostic Steps

1
Verify the battery state of charge (SoC) using the vehicle's interface.
2
Check for active processes or applications running in the background via the Tesla app.
3
Use Tesla's built-in diagnostics to check for any error codes related to battery or electrical systems.
4
Inspect the vehicle's settings to ensure energy-saving features are enabled.
5
Measure parasitic draw using a multimeter by disconnecting the negative terminal and connecting the multimeter in series.
6
Inspect fuses and relays for any anomalies or signs of damage.

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
•Fuse puller (optional)

Parts Required

•Replacement fuses (if any are blown)

Related Faults

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Diagnostic Steps

1
Verify the battery state of charge (SoC) using the vehicle's interface.
2
Check for active processes or applications running in the background via the Tesla app.
3
Use Tesla's built-in diagnostics to check for any error codes related to battery or electrical systems.
4
Inspect the vehicle's settings to ensure energy-saving features are enabled.
5
Measure parasitic draw using a multimeter by disconnecting the negative terminal and connecting the multimeter in series.
6
Inspect fuses and relays for any anomalies or signs of damage.

Solution

1. Preparation

Gather tools including a multimeter, socket set, and possibly a fuse puller.
Ensure the vehicle is parked on a flat surface and turned off.
Disconnect the negative battery terminal to ensure safety during inspection.

2. Check Parasitic Draw

Sub-steps:
1. With the multimeter set to the appropriate amp range, connect the positive lead to the disconnected negative battery terminal and the negative lead to the battery terminal.
2. Wait for the vehicle to enter sleep mode (this may take up to 30 minutes).
3. Record the reading; a parasitic draw above 50mA typically indicates an issue.

3. Inspect Components

Sub-steps:
1. Remove the fuse box cover to access fuses for components such as the infotainment system, battery management system, and any aftermarket installations.
2. Inspect each fuse for continuity using the multimeter or visually check for any blown fuses.
3. Replace any faulty fuses with the same rating.

4. Reset Systems

Sub-steps:
1. Reconnect the negative battery terminal.
2. Power on the vehicle and navigate to settings.
3. Perform a reset of the battery management system if applicable (consult owner's manual for specific reset instructions).
4. Ensure that energy-saving features, such as "Always Connected" settings, are properly configured.