how to fix Tesla Model S Original (2012-2020) when it won't accelerate

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

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

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the high voltage battery before working on electrical components.
•Always allow the vehicle to cool down before inspecting the drive unit.

Symptoms

•Acceleration is sluggish or non-existent
•Warning lights illuminated on the dashboard
•Unresponsive accelerator pedal
•Reduced power mode activated
•Error messages related to powertrain or battery

Diagnostic Steps

1
Scan the vehicle using an OBD-II scanner to retrieve any error codes.
2
Check the battery charge level via the touchscreen interface.
3
Inspect the drive unit for any visible damage or leaks.
4
Review the vehicle’s software version and check for available updates.
5
Test the accelerator pedal position sensor using a multimeter.
6
Examine the contactors and wiring for corrosion or damage.

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
•Screwdrivers
•Contact cleaner

Parts Required

•Accelerator pedal position sensor (if faulty)
•High voltage battery contactors (if damaged)

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Diagnostic Steps

1
Scan the vehicle using an OBD-II scanner to retrieve any error codes.
2
Check the battery charge level via the touchscreen interface.
3
Inspect the drive unit for any visible damage or leaks.
4
Review the vehicle’s software version and check for available updates.
5
Test the accelerator pedal position sensor using a multimeter.
6
Examine the contactors and wiring for corrosion or damage.

Solution

1. Preparation

Gather all necessary tools and parts.
Park the vehicle on a flat surface and ensure it is in "Park" mode.
Disconnect the high voltage battery by turning off the main battery switch (if applicable).

2. Update Software

Connect the vehicle to a Wi-Fi network.
Go to the software update section in the settings and check for available updates.
If an update is available, follow the on-screen prompts to install it.
Reboot the system after the update is complete.

3. Inspect and Replace the Accelerator Pedal Position Sensor

Remove the cover under the dashboard to access the accelerator pedal assembly.
Disconnect the wiring harness from the accelerator pedal position sensor.
Use a multimeter to check for continuity and voltage output while pressing the pedal.
If readings are not within the manufacturer specifications, replace the sensor:
- Unbolt the sensor from the assembly and install the new part.
- Reconnect the wiring harness and reassemble the dashboard cover.

4. Check and Replace High Voltage Battery Contacts

Remove the rear trunk panel to access the battery contactors.
Inspect the contacts for any signs of corrosion or damage.
Clean the contacts with a contact cleaner if necessary.
If damaged, replace the contactors using the appropriate tools:
- Disconnect the battery before removing any components.
- Install the new contactors and ensure all connections are tight.

5. Perform a System Reset

After completing repairs, perform a full system reset:
- Press and hold both scroll wheels on the steering wheel until the screen reboots.
- Allow the system to fully restart and check for any error messages.