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

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

545 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

Discover 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

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always disconnect the battery before working on electrical systems.
•Allow the battery to cool down before handling or inspecting.

Symptoms

•Decreased driving range compared to previous performance
•Frequent warnings about low battery state
•Battery charge percentage not increasing as expected
•Possible overheating during charging
•Longer charging times than usual
•Battery management system (BMS) warnings on the dashboard

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any battery management system alerts.
2
Inspect the battery pack for any visible damage or signs of leakage.
3
Check the battery health report through the Tesla app or vehicle display.
4
Measure the voltage of individual battery modules to identify any weak cells.
5
Test the charging system to ensure that the onboard charger is functioning correctly.
6
Review charging habits and settings to determine if there are any issues with charging practices.

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

•OBD-II scanner
•Multimeter
•Socket set
•Torque wrench
•Safety gear (gloves, goggles)

Parts Required

•Replacement battery modules (if needed)
•Battery management system updates (if applicable)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any battery management system alerts.
2
Inspect the battery pack for any visible damage or signs of leakage.
3
Check the battery health report through the Tesla app or vehicle display.
4
Measure the voltage of individual battery modules to identify any weak cells.
5
Test the charging system to ensure that the onboard charger is functioning correctly.
6
Review charging habits and settings to determine if there are any issues with charging practices.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a level surface with the parking brake engaged.
Disconnect the vehicle from any charging source.
Safety gear: gloves and safety goggles.

2. Battery Inspection

Inspect Battery Pack:
- Remove the underbody covers using a socket set.
- Visually inspect for any signs of damage, corrosion, or leaks.
Check Battery Connections:
- Loose or corroded connections can impair charging.
- Tighten or clean any corroded connections as needed.

3. Monitor Battery Health

Access the Tesla’s service menu to review battery health statistics.
If the battery capacity is significantly diminished, consider contacting Tesla service for evaluation.

4. Module Testing and Replacement

Voltage Testing:
- Use a multimeter to measure the voltage of each battery module.
- Identify any modules that are significantly lower than others.
Replace Faulty Modules:
- If defective modules are found, replace them with OEM parts.
- Follow proper procedures to safely remove and replace modules, ensuring connections are secure.

5. System Reset

Perform a soft reset of the vehicle's systems through the touchscreen:
- Hold down both scroll wheels on the steering wheel until the screen reboots.

6. Reassemble

Reinstall any covers removed during inspection and ensure all fasteners are torqued to specifications.
Connect the vehicle back to the charging source.