my Tesla Model S won't start, just clicks when I turn the key, what should I check?

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

507 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. 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 battery before working on any electrical components to avoid shock or damage.

Symptoms

•Clicking sound when the start button is pressed
•Dashboard lights dim or flicker
•No engine crank
•Possible 'Battery Charging Required' message on the display
•Interior lights may be weak or not illuminate

Diagnostic Steps

1
Check the 12V battery voltage using a multimeter; it should be between 12.4V and 12.6V when fully charged.
2
Inspect the battery connections for corrosion or looseness.
3
Verify that the high-voltage battery is charged using the vehicle's interface.
4
Use the Tesla mobile app or vehicle interface to check for any alerts or warnings related to the battery.
5
Attempt a soft reset of the vehicle by holding the steering wheel buttons until the display reboots.

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
•Wire brush

Parts Required

•12V battery (if replacement is necessary)
•Battery terminal cleaner/protector

Related Faults

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Diagnostic Steps

1
Check the 12V battery voltage using a multimeter; it should be between 12.4V and 12.6V when fully charged.
2
Inspect the battery connections for corrosion or looseness.
3
Verify that the high-voltage battery is charged using the vehicle's interface.
4
Use the Tesla mobile app or vehicle interface to check for any alerts or warnings related to the battery.
5
Attempt a soft reset of the vehicle by holding the steering wheel buttons until the display reboots.

Solution

1. Preparation

Gather necessary tools: multimeter, socket set, and cleaning supplies for battery terminals.
Ensure the vehicle is in the "Park" position and the key fob is nearby.
Disconnect the vehicle's 12V battery before performing any maintenance.

2. Inspect and Test the 12V Battery

Sub-step 1: Locate the 12V battery, typically found in the front trunk.
Sub-step 2: Use a multimeter to measure the voltage of the battery terminals.
- If the voltage is below 12.4V, proceed to recharge or replace the battery.
Sub-step 3: Clean the battery terminals using a wire brush and apply a battery terminal protector to prevent future corrosion.

3. Recharge or Replace the 12V Battery

Sub-step 1: If the battery is low, connect a compatible battery charger to the terminals, ensuring correct polarity.
Sub-step 2: Allow the battery to charge fully, typically for several hours.
Sub-step 3: If the battery is faulty (e.g., unable to hold a charge), remove the old battery using a socket set and replace it with a new, compatible 12V battery.
- Torque Specification: Tighten battery terminal connections to approximately 10-15 Nm.

4. Reconnect and Test

Sub-step 1: Reconnect the 12V battery, ensuring the terminals are secure.
Sub-step 2: Attempt to start the vehicle again by pressing the start button.
Sub-step 3: Observe the dashboard for any error messages or alerts.