how to troubleshoot my Tesla Model S Plaid/Refresh (2021-present) if it won’t start

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

591 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

Troubleshoot and fix starting issues in Tesla Model S Plaid (2021-present). Step-by-step guide with 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 avoid shock or short circuits.
•Ensure the vehicle is in 'Park' and on a flat surface during repairs.

Symptoms

•No response when pressing the brake pedal and the start button
•Dashboard lights and displays remain off
•"Vehicle is powering down" message on the screen
•Unable to unlock or access the vehicle via the mobile app
•Clicking sound from the front of the vehicle when attempting to start
•Battery level appears normal but the vehicle does not respond

Diagnostic Steps

1
Ensure the key fob is within range and functional; try using a backup key fob if available.
2
Check the state of charge of the high-voltage battery via the Tesla app or by inspecting the vehicle's charging status.
3
Inspect the 12V battery; check for any signs of corrosion, loose connections, or low voltage using a multimeter.
4
Perform a hard reset by holding down the scroll wheels on the steering wheel until the screen resets.
5
Check for any error messages or alerts in the vehicle's display once diagnostics and resets have been performed.
6
Review the vehicle logs via the Tesla app or service portal for any fault codes or warnings.

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
•Portable charger

Parts Required

•Replacement 12V battery

Related Faults

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Symptoms

•No response when pressing the brake pedal and the start button

•Dashboard lights and displays remain off

•"Vehicle is powering down" message on the screen

•Unable to unlock or access the vehicle via the mobile app

•Clicking sound from the front of the vehicle when attempting to start

•Battery level appears normal but the vehicle does not respond

Diagnostic Steps

1
Ensure the key fob is within range and functional; try using a backup key fob if available.
2
Check the state of charge of the high-voltage battery via the Tesla app or by inspecting the vehicle's charging status.
3
Inspect the 12V battery; check for any signs of corrosion, loose connections, or low voltage using a multimeter.
4
Perform a hard reset by holding down the scroll wheels on the steering wheel until the screen resets.
5
Check for any error messages or alerts in the vehicle's display once diagnostics and resets have been performed.
6
Review the vehicle logs via the Tesla app or service portal for any fault codes or warnings.

Solution

1. Preparation

Gather necessary tools: multimeter, socket set, and a portable charger if needed.
Ensure the vehicle is in a safe, level area for access and repairs.
Disconnect the vehicle from any charging source if applicable.

2. Inspect and Replace the 12V Battery

Sub-step 1: Open the front trunk (frunk) and locate the 12V battery.
Sub-step 2: Use a multimeter to check battery voltage; it should read approximately 12.6V or higher.
Sub-step 3: If the voltage is low, disconnect the negative terminal first, followed by the positive terminal.
Sub-step 4: Remove the battery hold-down bracket and lift the 12V battery out of its compartment.
Sub-step 5: Install the new 12V battery by placing it into the compartment and securing it with the hold-down bracket.
Sub-step 6: Reconnect the positive terminal first, then the negative terminal. Ensure connections are tight and free of corrosion.

3. Reset the Vehicle Electronics

Sub-step 1: After replacing the battery, perform a hard reset again by holding down the scroll wheels on the steering wheel until the screen resets.
Sub-step 2: Wait for the vehicle systems to reboot and check for any notifications or alerts displayed.
Sub-step 3: Test the vehicle’s functionality by pressing the brake pedal and the start button.