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

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 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 symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always wear appropriate safety gear when working with high-voltage systems.
•Disconnect the 12V battery before performing any repairs to electrical components.

Symptoms

•Sudden decrease in acceleration
•Warning message on the dashboard
•Vehicle may enter 'limp mode'
•Decreased battery range
•Unusual sounds from the electric motor

Diagnostic Steps

1
Check the dashboard for any warning alerts or messages indicating a fault.
2
Use a Tesla diagnostic tool to retrieve error codes from the vehicle's computer.
3
Inspect the battery health and state of charge via the Tesla app or onboard display.
4
Verify connections and condition of high-voltage battery cables and connectors.
5
Check for any software updates available for the vehicle through the Tesla interface.
6
Inspect the electric motor for any visible damage or signs of wear.

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
•Socket set
•Torque wrench

Parts Required

•High-voltage battery cables (if damaged)
•Replacement battery (if health is significantly degraded)

Related Faults

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Diagnostic Steps

1
Check the dashboard for any warning alerts or messages indicating a fault.
2
Use a Tesla diagnostic tool to retrieve error codes from the vehicle's computer.
3
Inspect the battery health and state of charge via the Tesla app or onboard display.
4
Verify connections and condition of high-voltage battery cables and connectors.
5
Check for any software updates available for the vehicle through the Tesla interface.
6
Inspect the electric motor for any visible damage or signs of wear.

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 proceeding with any high-voltage work.

2. Check Battery Health

Use the Tesla app or diagnostic tool to assess battery health.
If battery degradation is significant (below 70% capacity), consider battery replacement.

3. Inspect High-Voltage Connections

Remove the rear trunk panel to access the battery connections.
Inspect the high-voltage battery cables for any signs of damage, corrosion, or loose connections.
Tighten any loose connections and replace damaged cables as necessary.

4. Software Update

Connect the vehicle to Wi-Fi and check for any available software updates.
If updates are available, follow the prompts on the touchscreen to install them.

5. Electric Motor Inspection

Inspect the electric motor for any unusual signs of wear or damage.
If necessary, consult the service manual for specific inspection procedures and torque specifications for motor components.

6. Reconnect Battery

Reconnect the 12V battery and ensure all connections are secure.
Perform a soft reset of the vehicle by pressing and holding both scroll wheels on the steering wheel until the screen resets.