how to diagnose my Tesla Model S Original (2012-2020) starting problems

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

505 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 starting problems in Tesla Model S (2012-2020). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the 12V battery before working on electrical systems to prevent short circuits.

Symptoms

•Display shows 'Powering On' message without starting
•No response when pressing the brake pedal or start button
•Key fob not recognized or failing to unlock the vehicle
•High-pitched whirring noise from the rear when attempting to start
•Dashboard lights flickering or dim
•Vehicle remains unresponsive despite multiple attempts to start

Diagnostic Steps

1
Verify the battery charge level using the Tesla app or dashboard display.
2
Check the key fob battery; replace it if it's low or dead.
3
Perform a soft reset of the vehicle by holding down both scroll wheels on the steering wheel until the Tesla logo appears.
4
Inspect the 12V battery for voltage (should be around 12.6V) using a multimeter.
5
Run a diagnostic using the Tesla service menu to check for error codes related to starting issues.
6
Ensure that all doors and the trunk are closed properly; open doors can prevent the vehicle from starting.

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

Parts Required

•12V battery
•CR2032 key fob battery

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Symptoms

•Display shows 'Powering On' message without starting

•No response when pressing the brake pedal or start button

•Key fob not recognized or failing to unlock the vehicle

•High-pitched whirring noise from the rear when attempting to start

•Dashboard lights flickering or dim

•Vehicle remains unresponsive despite multiple attempts to start

Diagnostic Steps

1
Verify the battery charge level using the Tesla app or dashboard display.
2
Check the key fob battery; replace it if it's low or dead.
3
Perform a soft reset of the vehicle by holding down both scroll wheels on the steering wheel until the Tesla logo appears.
4
Inspect the 12V battery for voltage (should be around 12.6V) using a multimeter.
5
Run a diagnostic using the Tesla service menu to check for error codes related to starting issues.
6
Ensure that all doors and the trunk are closed properly; open doors can prevent the vehicle from starting.

Solution

1. Preparation

Gather necessary tools: multimeter, flathead screwdriver, and a replacement key fob battery if needed.
Ensure the vehicle is in a safe, ventilated area.

2. Check and Replace the 12V Battery

Sub-steps:
1. Open the front trunk and locate the 12V battery compartment.
2. Disconnect the negative terminal first, followed by the positive terminal.
3. Remove the old battery and replace it with a new one (ensure it's an appropriate type, typically a Group 48 or similar).
4. Reconnect the positive terminal first, then the negative terminal, ensuring a tight fit.
5. Close the battery compartment.

3. Key Fob Replacement

Sub-steps:
1. Open the back of the key fob using a flathead screwdriver.
2. Replace the old battery (CR2032) with a new one, ensuring correct polarity.
3. Snap the key fob back together and test its functionality.

4. Software Reset

Sub-steps:
1. With the vehicle in "Park," press and hold both scroll wheels on the steering wheel.
2. Wait for the Tesla logo to appear; this can take about 10 seconds.
3. Release the scroll wheels and allow the system to reboot.