my Tesla Model S Original (2012-2020) won't start and just clicks what should I check

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

491 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 the no-start issue 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 shock or short circuits.
•Allow the vehicle to cool down before inspecting electrical components.

Symptoms

•Clicking noise when the start button is pressed
•Dashboard lights may illuminate but the vehicle does not start
•Possible loss of power to electrical components
•Battery management system warning on display
•No power to the 12V system or auxiliary systems

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, looseness, or damage.
3
Test the main battery pack state of charge using the Tesla app or onboard display.
4
Use an OBD-II scanner to check for any fault codes related to battery or electrical system.
5
Verify the operation of the key fob and ensure it is functioning properly.
6
Inspect the contactor for the main battery pack to determine if it is engaging.

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

•Socket set
•Multimeter
•Wrenches
•Battery terminal cleaner

Parts Required

•Replacement 12V battery
•Main battery contactor (if faulty)

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 12V battery connections for corrosion, looseness, or damage.
3
Test the main battery pack state of charge using the Tesla app or onboard display.
4
Use an OBD-II scanner to check for any fault codes related to battery or electrical system.
5
Verify the operation of the key fob and ensure it is functioning properly.
6
Inspect the contactor for the main battery pack to determine if it is engaging.

Solution

1. Preparation

Ensure the vehicle is in a safe environment with adequate space to work.
Disconnect the 12V battery negative terminal to prevent any electrical short.

2. Check and Replace the 12V Battery

Tools Required: Socket set, multimeter, wrenches, battery terminal cleaner.
Inspect the 12V battery for any signs of swelling or leakage.
If the voltage is low or the battery is damaged:
1. Remove the negative terminal first using the socket set.
2. Remove the positive terminal next.
3. Unfasten the battery hold-down bracket using appropriate tools.
4. Carefully lift the battery out of the tray.
5. Install the new battery in reverse order (positive first, then negative).
6. Tighten the battery terminals securely.
7. Reconnect the negative terminal last.

3. Check the Main Battery Contactors

Tools Required: Multimeter, socket set.
After replacing the 12V battery, reconnect the battery and check the contactor:
1. Use the multimeter to ensure the contactor is receiving power.
2. If there is no power, inspect the wiring and connections leading to the contactor.
3. If the contactor is faulty, replace it by unbolting it from the vehicle and installing a new one.