why does my Tesla Model S Original (2012-2020) make a clicking noise when starting

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

544 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 clicking noise when starting your Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Allow the vehicle to cool before performing inspections.

Symptoms

•Clicking noise when attempting to start the vehicle
•Dashboard lights dimming or flickering during start attempt
•Failure to start or only partial engagement of the starting system
•No power to accessories or limited functionality
•Repeated clicking noise with no engine turnover

Diagnostic Steps

1
Verify the state of the 12V battery by checking the voltage with a multimeter.
2
Inspect the connections and terminals of the 12V battery for corrosion or looseness.
3
Check the main contactor and battery management system for proper functionality.
4
Use the vehicle's onboard diagnostics to check for any error codes related to the starting system.
5
Test the power distribution module for functionality and any signs of damage.

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
•Wire brush or terminal cleaner

Parts Required

•12V battery (if replacement is needed)
•Main contactor (if faulty)

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Diagnostic Steps

1
Verify the state of the 12V battery by checking the voltage with a multimeter.
2
Inspect the connections and terminals of the 12V battery for corrosion or looseness.
3
Check the main contactor and battery management system for proper functionality.
4
Use the vehicle's onboard diagnostics to check for any error codes related to the starting system.
5
Test the power distribution module for functionality and any signs of damage.

Solution

1. Preparation

Gather tools and parts.
Tools Required: Multimeter, socket set, torque wrench, and cleaning supplies.
Disconnect the vehicle's 12V battery to avoid electrical hazards.

2. Inspect and Test 12V Battery

Sub-steps:
1. Remove the cover of the 12V battery compartment.
2. Disconnect the negative terminal first, followed by the positive terminal.
3. Use a multimeter to measure the voltage; it should read around 12.6 volts or higher.
4. If the voltage is below 12.4 volts, charge or replace the battery as needed.
Safety Warning: Ensure the vehicle is powered off before starting this procedure.

3. Clean and Tighten Battery Connections

Sub-steps:
1. Inspect battery terminals for corrosion; clean with a mixture of baking soda and water if necessary.
2. Tighten the connections to ensure a secure fit, starting with the positive terminal followed by the negative.
Tools Required: Wire brush or terminal cleaner.

4. Check Main Contactor

Sub-steps:
1. Locate the main contactor assembly within the vehicle.
2. Test the contactor for proper operation using a multimeter.
3. Replace the contactor if it does not engage or show continuity.
Safety Warning: Be cautious when working with high-voltage components.

5. Reconnect Battery and Test

Sub-steps:
1. Reconnect the positive terminal first, followed by the negative terminal.
2. Power on the vehicle and attempt to start.
3. Listen for the clicking noise; if it persists, further investigation into the power distribution module may be required.