how to reset the Tesla Model S Original (2012-2020) battery management system

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

30-60 minutes

Time

medium

Difficulty

medium

Severity

3 min read

492 words

Problem Statement

Learn how to reset the battery management system of a Tesla Model S (2012-2020). Step-by-step guide to troubleshoot battery issues and ensure optimal performance.

Affected Component

Electrical

Estimated Time

30-60 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in 'Park' before performing any resets.
•Be cautious when handling the 12V battery; avoid short circuits and ensure that tools do not touch both terminals simultaneously.

Symptoms

•Battery not charging properly
•Decreased driving range
•Erratic battery percentage display
•Performance issues while driving
•Inaccurate state of charge readings

Diagnostic Steps

1
Ensure the vehicle is in 'Park' mode and the key fob is present.
2
Open the Tesla app and check for any software updates that may need to be applied.
3
Verify that the vehicle's battery is sufficiently charged (above 20%).
4
Access the vehicle's settings via the touchscreen to confirm battery settings.
5
Perform a soft reset of the touchscreen by pressing and holding both scroll wheels on the steering wheel until the screen turns off and then back on.

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

•None

Parts Required

•None

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Diagnostic Steps

1
Ensure the vehicle is in 'Park' mode and the key fob is present.
2
Open the Tesla app and check for any software updates that may need to be applied.
3
Verify that the vehicle's battery is sufficiently charged (above 20%).
4
Access the vehicle's settings via the touchscreen to confirm battery settings.
5
Perform a soft reset of the touchscreen by pressing and holding both scroll wheels on the steering wheel until the screen turns off and then back on.

Solution

1. Preparation

Gather necessary tools: None required for this procedure.
Ensure the vehicle is parked on a flat surface and the key fob is nearby.

2. Perform a Battery Management System Reset

Soft Reset of the Touchscreen:
- Press and hold both scroll wheels on the steering wheel until the touchscreen turns off.
- Wait for the Tesla logo to appear on the screen, indicating the reset is in progress.
Hard Reset of the BMS:
- Disconnect the car's 12V battery:
  - Open the front trunk (frunk) and locate the 12V battery.
  - Disconnect the negative lead first, followed by the positive lead.
  - Wait for about 5-10 minutes.
- Reconnect the 12V battery:
  - Connect the positive lead first, then the negative lead.
  - Ensure connections are secure and do not touch any metal parts with your tools.
Power Cycle the Vehicle:
- After reconnecting, press the brake pedal and press the "Start" button to power the vehicle back on.
- Allow the vehicle to stay in "Park" for a few minutes to let the BMS recalibrate.

3. Monitor Battery Performance

After the reset, monitor the battery performance for a few days to ensure that the system is functioning properly.