how to troubleshoot my Tesla Model S Original (2012-2020) when it won’t start?

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

537 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 troubleshoot and fix no-start issues in Tesla Model S (2012-2020). Step-by-step guide with diagnostic steps and solutions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Handle the battery carefully to avoid short circuits.
•Ensure the vehicle is in a safe position to avoid any unintended movement.
•Disconnect the 12V battery before servicing any electrical components to avoid shock or damage.

Symptoms

•No response when pressing the brake pedal and the start button
•Dash displays show no power or indicators
•Error messages on the touchscreen about battery or power issues
•Key not detected message appears
•Lights and accessories may work but the vehicle remains unresponsive to start

Diagnostic Steps

1
Check the 12V battery voltage using a multimeter to ensure it is above 12.4 volts.
2
Inspect the key fob battery to confirm it has sufficient charge and is functioning.
3
Attempt to power cycle the vehicle by turning off and then on again using the touchscreen.
4
Verify that the brake pedal is fully pressed when attempting to start.
5
Check for any error codes using the Tesla mobile app or service menu.
6
Inspect the main battery pack via the Tesla app for any notifications regarding state of charge or faults.

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

•Multimeter
•Flathead screwdriver
•10mm socket

Parts Required

•12V battery
•CR2032 key fob battery

Related Faults

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Diagnostic Steps

1
Check the 12V battery voltage using a multimeter to ensure it is above 12.4 volts.
2
Inspect the key fob battery to confirm it has sufficient charge and is functioning.
3
Attempt to power cycle the vehicle by turning off and then on again using the touchscreen.
4
Verify that the brake pedal is fully pressed when attempting to start.
5
Check for any error codes using the Tesla mobile app or service menu.
6
Inspect the main battery pack via the Tesla app for any notifications regarding state of charge or faults.

Solution

1. Preparation

Tools Required: Multimeter, flathead screwdriver, 10mm socket, replacement key fob battery (if needed)
Ensure the vehicle is parked in a safe location and the environment is clear.

2. Check 12V Battery

Sub-steps:
1. Open the front trunk (frunk) and locate the 12V battery.
2. Use a multimeter to measure the voltage across the battery terminals.
3. If the voltage is below 12.4V, consider replacing the 12V battery.
Safety Warnings: Handle the battery carefully to avoid short circuits.

3. Replace Key Fob Battery

Sub-steps:
1. Use a flathead screwdriver to gently pry open the key fob.
2. Remove the old battery and replace it with a new CR2032 battery, ensuring correct polarity.
3. Reassemble the key fob securely.
Tools Required: Flathead screwdriver

4. Power Cycle the Vehicle

Sub-steps:
1. Hold down the brake pedal.
2. Press and hold the two scroll wheels on the steering wheel until the screen goes black.
3. Wait for the Tesla logo to appear, indicating the vehicle is rebooting.
Safety Warnings: Ensure the vehicle is in a safe position to avoid any unintended movement.

5. Check for Error Codes

Sub-steps:
1. Access the Tesla mobile app.
2. Navigate to the service section and check for any diagnostic messages or error codes.
3. Document any errors for further investigation or service.