my Tesla Model S Original (2012-2020) won’t start, is it the battery or something else?

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

501 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 issues 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 high-voltage systems before working on the battery.
•Ensure vehicle is powered off before performing any repairs.

Symptoms

•No response when pressing the start button
•Instrument cluster displays no lights or indicators
•Clicking sound from the dashboard when attempting to start
•Key fob not recognized by the vehicle
•Vehicle unable to power on accessories (e.g., lights, radio)

Diagnostic Steps

1
Check the key fob battery and ensure it is functioning properly.
2
Attempt to jump-start the vehicle using a compatible charger or another vehicle.
3
Inspect the main battery voltage using the Tesla app or a multimeter.
4
Check for any error messages or alerts displayed on the vehicle’s screen.
5
Verify the condition of the 12V auxiliary battery with a multimeter.
6
Confirm the vehicle is in the proper gear (Park) and all doors are closed.

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
•Jump starter or jumper cables
•Screwdriver set

Parts Required

•CR2032 battery
•12V auxiliary battery

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Diagnostic Steps

1
Check the key fob battery and ensure it is functioning properly.
2
Attempt to jump-start the vehicle using a compatible charger or another vehicle.
3
Inspect the main battery voltage using the Tesla app or a multimeter.
4
Check for any error messages or alerts displayed on the vehicle’s screen.
5
Verify the condition of the 12V auxiliary battery with a multimeter.
6
Confirm the vehicle is in the proper gear (Park) and all doors are closed.

Solution

1. Preparation

Gather necessary tools and components.
Ensure the vehicle is in a safe location and on level ground.
Disconnect the Tesla from any charging sources.

2. Check Key Fob Battery

Remove the key fob from its housing.
Replace the battery with a new CR2032 coin cell battery.
Reassemble the key fob and test its functionality.

3. Jump-Start the Vehicle

Locate the jump-start terminals under the front trunk.
Connect a compatible jump starter or another vehicle with jumper cables:
- Red cable to the positive (+) terminal.
- Black cable to the negative (-) terminal.
Attempt to start the vehicle after a few minutes of charging.

4. Inspect Main Battery and 12V Battery

Use a multimeter to check the voltage of the main battery (should be above 12.5V).
If low, connect to a Tesla Supercharger or Level 2 charger to recharge.
Check the 12V battery voltage (should be above 12.6V). If low, consider replacing the 12V battery:
- Remove the cover in the front trunk.
- Disconnect the negative terminal first, followed by the positive terminal.
- Remove the old battery and install the new one in reverse order.