why does my Tesla Model S Plaid/Refresh (2021-present) 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

515 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

Diagnose and fix the clicking noise during startup in Tesla Model S Plaid. 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 components to avoid shock or damage.
•Allow the vehicle to cool down before inspecting any components to avoid burns.

Symptoms

•Clicking noise when attempting to start the vehicle
•Dashboard warning lights illuminated
•Vehicle does not start or shows prolonged cranking
•Possible dimming of interior lights during starting attempt
•Occasional loss of power to accessories

Diagnostic Steps

1
Inspect the 12V battery voltage using a multimeter; it should read around 12.6 volts or higher.
2
Check for loose or corroded battery terminals and connections.
3
Examine the main battery pack connections and fuses for integrity.
4
Use the vehicle's diagnostic system to scan for any error codes related to the starting system.
5
Verify the functionality of the key fob and ensure it is properly communicating with the vehicle.
6
Inspect the contactor relays for the traction battery to ensure they are functioning properly.

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
•Battery cleaning brush

Parts Required

•12V battery (if replacement is necessary)
•Contactors (if found defective)

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Diagnostic Steps

1
Inspect the 12V battery voltage using a multimeter; it should read around 12.6 volts or higher.
2
Check for loose or corroded battery terminals and connections.
3
Examine the main battery pack connections and fuses for integrity.
4
Use the vehicle's diagnostic system to scan for any error codes related to the starting system.
5
Verify the functionality of the key fob and ensure it is properly communicating with the vehicle.
6
Inspect the contactor relays for the traction battery to ensure they are functioning properly.

Solution

1. Preparation

Gather necessary tools: multimeter, socket set, and cleaning supplies.
Ensure the vehicle is in "Park" and all accessories are turned off.
Disconnect the 12V battery before proceeding with any electrical work to ensure safety.

2. Battery Inspection and Replacement

Inspect the 12V Battery:
- Use a multimeter to measure the battery voltage.
- If voltage is below 12.4 volts, consider charging or replacing the battery.
Replacing the 12V Battery:
- Remove the cover of the battery compartment.
- Disconnect the negative terminal first, followed by the positive terminal.
- Remove the battery hold-down strap and lift out the old battery.
- Insert the new battery and secure it with the hold-down strap.
- Reconnect the positive terminal first, followed by the negative terminal.

3. Clean and Secure Connections

Check Battery Terminals:
- Clean any corrosion on the terminals using a battery cleaning brush or a mixture of baking soda and water.
- Ensure all connections are tight and secure.

4. Check Contactor Relays

Inspect Contactor Relays:
- Locate the contactor relays in the vehicle.
- Check for any visible damage or signs of malfunction.
- If defective, replace the relays according to the manufacturer’s specifications.