how to troubleshoot Tesla Model S Original (2012-2020) that won't start

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 troubleshoot and fix the no-start issue in 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 the 12V battery before performing electrical work to avoid shock or short circuits.

Symptoms

•No response when pressing the brake pedal or the start button
•Key fob not detected or unable to unlock the car
•Dashboard lights and indicators remain off
•"Powering On" message displays for an extended period without further action
•No sounds from the electric motor or systems

Diagnostic Steps

1
Check the key fob battery to ensure it is functional and replace if necessary.
2
Inspect the 12V auxiliary battery for proper voltage (should be around 12.6V).
3
Attempt to reset the vehicle by holding down the brake pedal and pressing the scroll wheels on the steering wheel for 10 seconds.
4
Use the Tesla app to check for any alerts or notifications regarding vehicle status.
5
Connect a diagnostic tool to check for any error codes related to the battery management system or other electrical components.
6
Verify that the vehicle is not in "Tow Mode" or "Transport Mode" which can inhibit starting.

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

•OBD-II scanner
•Multimeter
•Basic hand tools

Parts Required

•CR2032 battery for key fob
•12V auxiliary battery (if replacement is needed)

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Diagnostic Steps

1
Check the key fob battery to ensure it is functional and replace if necessary.
2
Inspect the 12V auxiliary battery for proper voltage (should be around 12.6V).
3
Attempt to reset the vehicle by holding down the brake pedal and pressing the scroll wheels on the steering wheel for 10 seconds.
4
Use the Tesla app to check for any alerts or notifications regarding vehicle status.
5
Connect a diagnostic tool to check for any error codes related to the battery management system or other electrical components.
6
Verify that the vehicle is not in "Tow Mode" or "Transport Mode" which can inhibit starting.

Solution

1. Preparation

Tools Required: OBD-II scanner (if needed), multimeter, basic hand tools.
Ensure the vehicle is in a safe location and on level ground.
Disconnect the vehicle from any charging source.

2. Inspect and Replace Key Fob Battery

Sub-steps:
1. Open the key fob casing using a small flathead screwdriver.
2. Remove the old battery and insert a new CR2032 battery, ensuring proper polarity.
3. Reassemble the key fob and test its functionality.

3. Check/Replace the 12V Battery

Sub-steps:
1. Open the front trunk (frunk) and locate the 12V battery.
2. Use a multimeter to measure the voltage; if it's below 12.4V, consider charging or replacing it.
3. If replacing, disconnect the negative terminal first, then the positive terminal.
4. Install the new battery by connecting the positive terminal first, followed by the negative terminal.
5. Close the frunk and attempt to start the vehicle again.

4. Reset the Vehicle

Sub-steps:
1. Sit in the driver’s seat with the key fob inside the vehicle.
2. Press and hold the brake pedal.
3. Simultaneously press the left and right scroll wheels on the steering wheel until the touchscreen resets (approximately 10 seconds).
4. Wait for the vehicle to power back on and check if it starts.