why is my Tesla Model S Original (2012-2020) battery not holding a charge

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

4-8 hours

Time

hard

Difficulty

high

Severity

3 min read

543 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix battery issues in Tesla Model S (2012-2020). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

4-8 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the 12V battery before working on high-voltage systems.
•Always wear protective gloves and goggles when handling battery components.

Symptoms

•Reduced driving range compared to previous performance
•Battery percentage depleting faster than normal
•Frequent need for recharging
•Warning messages related to battery health
•Check battery health via vehicle settings

Diagnostic Steps

1
Inspect battery health status using the vehicle's onboard diagnostics.
2
Use a Tesla-specific diagnostic tool to retrieve any error codes related to the battery.
3
Check for any visible damage or corrosion on battery terminals and connections.
4
Monitor charging cycles to determine if the charging is inconsistent or failing.
5
Test the vehicle's charging system to ensure it is functioning properly.
6
Verify software updates are installed, as they can affect battery management systems.

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

•Tesla diagnostic tool
•Wrench set
•Wire brush
•Protective gloves
•Socket set
•Torque wrench
•Safety goggles

Parts Required

•Replacement battery pack
•Battery terminal connectors

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Diagnostic Steps

1
Inspect battery health status using the vehicle's onboard diagnostics.
2
Use a Tesla-specific diagnostic tool to retrieve any error codes related to the battery.
3
Check for any visible damage or corrosion on battery terminals and connections.
4
Monitor charging cycles to determine if the charging is inconsistent or failing.
5
Test the vehicle's charging system to ensure it is functioning properly.
6
Verify software updates are installed, as they can affect battery management systems.

Solution

1. Preparation

Gather necessary tools and ensure the vehicle is parked on a level surface.
Disconnect the 12V battery to ensure safety while working on the high-voltage system.

2. Inspect and Clean Battery Connections

Tools Required: Wrench set, wire brush, protective gloves
Remove the battery terminal covers to access connections.
Inspect the terminals for corrosion or damage.
Clean the terminals with a wire brush and a mixture of baking soda and water.
Reconnect the terminals securely.

3. Battery Management System (BMS) Reset

Tools Required: Tesla diagnostic tool or mobile app
Using the Tesla app or diagnostic tool, navigate to the battery management system settings.
Follow the manufacturer's instructions to perform a BMS reset, which can help recalibrate the battery's charge levels.

4. Battery Replacement (if necessary)

Tools Required: Socket set, torque wrench, safety goggles
Remove the rear underbody panel to access the battery pack.
Disconnect the high-voltage battery connectors carefully.
Unbolt and remove the battery pack following manufacturer specifications.
Install the new battery pack using the reverse of removal steps, ensuring all connections are secure and torqued to specifications.

5. Final Checks and Reconnection

Reconnect the 12V battery and ensure all systems are operational.
Perform a software update if prompted by the vehicle.
Conduct a test charge to verify the battery holds the charge properly.