how to fix my Tesla Model S Original (2012-2020) that won't start just clicks

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-3 hours

Time

medium

Difficulty

high

Severity

3 min read

506 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 a Tesla Model S that won't start and just clicks. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the 12V battery before working on electrical systems.
•Allow the main battery to cool before working on it if it has been charged recently.

Symptoms

•Clicking sound when the start button is pressed
•Dashboard lights illuminate but engine does not start
•No power to the drive motors
•Issues with accessory power (e.g., radio, lights)
•Possible warning messages on the display (e.g., 'Low Battery')

Diagnostic Steps

1
Check the 12V battery voltage using a multimeter to ensure it is above 12.4 volts.
2
Inspect the 12V battery connections for corrosion or loose terminals.
3
Verify the main battery pack's state of charge via the Tesla app or vehicle display.
4
Examine the contactor for the main battery pack for proper operation and engagement.
5
Scan for any error codes using Tesla's diagnostic tools or the Tesla mobile app.

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
•Socket set
•Torque wrench
•Battery charger

Parts Required

•New 12V battery
•New battery contactor (if needed)

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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 12V battery connections for corrosion or loose terminals.
3
Verify the main battery pack's state of charge via the Tesla app or vehicle display.
4
Examine the contactor for the main battery pack for proper operation and engagement.
5
Scan for any error codes using Tesla's diagnostic tools or the Tesla mobile app.

Solution

1. Preparation

Tools Required: Multimeter, socket set, torque wrench, and a battery charger.
Safety Warnings: Disconnect the 12V battery before working on electrical systems.

2. Check and Replace the 12V Battery

Disconnect the negative terminal of the 12V battery.
Remove the cover to access the 12V battery.
Disconnect the positive terminal and then the negative terminal.
Remove the 12V battery from the compartment.
Install the new 12V battery, connecting the positive terminal first, followed by the negative terminal.
Reconnect the battery cover and ensure all connections are secure.

3. Inspect and Replace Battery Contactors (if necessary)

Access the contactor by removing the necessary underbody panels.
Inspect the contactor for signs of wear or failure.
If faulty, remove the old contactor by disconnecting the wiring harness and unbolting it.
Install the new contactor, ensuring proper torque specifications are followed (typically 20 Nm for contactor bolts).
Reconnect the wiring harness securely.

4. Recharge the Main Battery Pack (if low)

Connect the Tesla charging cable to the vehicle and plug it into an appropriate power source.
Monitor the charging status through the vehicle display or Tesla app.
Allow the vehicle to charge until adequate charge level is achieved (typically above 20%).