why does my Tesla Model S Original (2012-2020) lose power when accelerating

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

560 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 power loss during acceleration in Tesla Model S (2012-2020). Step-by-step guide with tools and solutions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always disconnect the high-voltage battery before working on electrical systems.
•Allow the vehicle to cool before inspecting the motor and inverter components.

Symptoms

•Loss of acceleration power when pressing the accelerator pedal
•Unresponsive throttle or delayed throttle response
•Battery warning indicators on the dashboard
•Reduced range displayed on the vehicle's monitor
•Possible 'Power Reduced' message on the screen
•Increased energy consumption during driving

Diagnostic Steps

1
Use an OBD-II scanner to check for any stored error codes related to the powertrain or battery management system.
2
Inspect the battery health and state of charge using the Tesla app or vehicle diagnostics.
3
Check the throttle position sensor readings for any irregularities.
4
Review the vehicle's performance settings and ensure they are set to normal rather than 'Chill' mode.
5
Inspect the high-voltage battery connections for any signs of corrosion or loose terminals.
6
Conduct a visual inspection of the motor and inverter for any signs of damage or overheating.

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
•Screwdriver set

Parts Required

•Throttle position sensor (if replacement is necessary)
•High-voltage battery connectors (if damaged)

Related Faults

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Symptoms

•Loss of acceleration power when pressing the accelerator pedal

•Unresponsive throttle or delayed throttle response

•Battery warning indicators on the dashboard

•Reduced range displayed on the vehicle's monitor

•Possible 'Power Reduced' message on the screen

•Increased energy consumption during driving

Diagnostic Steps

1
Use an OBD-II scanner to check for any stored error codes related to the powertrain or battery management system.
2
Inspect the battery health and state of charge using the Tesla app or vehicle diagnostics.
3
Check the throttle position sensor readings for any irregularities.
4
Review the vehicle's performance settings and ensure they are set to normal rather than 'Chill' mode.
5
Inspect the high-voltage battery connections for any signs of corrosion or loose terminals.
6
Conduct a visual inspection of the motor and inverter for any signs of damage or overheating.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface and power down the car.
Disconnect the 12V battery for safety.

2. Check Battery Health

Reconnect the 12V battery and start the vehicle.
Access the battery management system via the vehicle’s settings and check the battery health status.
If battery health is below 70%, consider replacing the battery pack.

3. Inspect Throttle Position Sensor

Locate the throttle position sensor connector on the motor assembly.
Unplug the connector and use a multimeter to test voltage output while manually moving the throttle.
If readings are outside the expected range, replace the throttle position sensor.

4. Inspect High-Voltage Connections

Power down the vehicle and disconnect the high-voltage battery pack.
Inspect and clean all connections thoroughly, ensuring that there is no corrosion.
Reconnect the high-voltage battery pack securely.

5. Update Software

Connect the vehicle to Wi-Fi and check for any available software updates through the Tesla interface.
Install any updates as required, which can resolve potential software-related issues affecting performance.

6. Reassemble and Test

Reconnect all connectors and ensure everything is securely in place.
Start the vehicle and perform a test drive to evaluate if the power loss issue persists.