my Tesla Model S Original (2012-2020) is losing power while driving

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-3 hours

Time

medium

Difficulty

high

Severity

3 min read

479 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 power loss issues in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the 12V battery before working on any electrical components.
•Allow the vehicle to cool down before inspecting the high-voltage battery.

Symptoms

•Reduced acceleration and overall power output
•Warning messages on the dashboard
•Sudden decrease in speed without driver input
•Regenerative braking not functioning as expected
•Battery charge depleting faster than normal

Diagnostic Steps

1
Check the vehicle's software version and ensure it is up to date.
2
Use the Tesla app or onboard diagnostics to check for error codes related to the battery or powertrain.
3
Inspect the high-voltage battery for any visible damage or loose connections.
4
Monitor battery temperature and voltage levels using diagnostic tools.
5
Evaluate the state of charge and health of the battery through the vehicle's diagnostics.

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

•Diagnostic tool (compatible with Tesla)
•Wire brush for terminal cleaning
•Torque wrench (for battery connections)

Parts Required

•Replacement battery terminals or connectors (if damaged)
•High-voltage battery (if battery health is critically low)

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Diagnostic Steps

1
Check the vehicle's software version and ensure it is up to date.
2
Use the Tesla app or onboard diagnostics to check for error codes related to the battery or powertrain.
3
Inspect the high-voltage battery for any visible damage or loose connections.
4
Monitor battery temperature and voltage levels using diagnostic tools.
5
Evaluate the state of charge and health of the battery through the vehicle's diagnostics.

Solution

1. Preparation

Ensure the vehicle is parked on a level surface and the parking brake is engaged.
Disconnect the 12V battery for safety before working on the high-voltage system.
Gather necessary tools and equipment.

2. Update Software

Connect the vehicle to Wi-Fi.
Access the software update menu in the touchscreen interface.
Follow prompts to install any available updates.

3. Inspect Battery Connections

Remove the rear trunk panel to access the battery terminal connections.
Check for corrosion or loose connections on both the positive and negative terminals.
Tighten any loose connections and clean terminals with a wire brush.

4. Test Battery Health

Reconnect the 12V battery.
Use a diagnostic tool to assess the health of the high-voltage battery.
If battery health is below 70%, consider contacting Tesla for battery replacement options.

5. Clear Error Codes

After completing inspections and potential repairs, clear any error codes using the Tesla diagnostic tool.
Check for reoccurrence of error codes after a short test drive.