my Tesla Model S Original (2012-2020) has no power when I turn the key what to do

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

4 min read

604 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 power 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 battery before working on electrical systems.
•Ensure the vehicle is powered off before performing any repairs.

Symptoms

•No response when the key fob is used to unlock or start the vehicle
•Dashboard lights are completely off
•No sounds from the vehicle (e.g., clicking or engine noises)
•Key fob not recognized by the vehicle
•Power windows and doors do not operate
•12V battery warning message displayed (if applicable)

Diagnostic Steps

1
Check the key fob battery to ensure it is charged and functioning.
2
Inspect the 12V battery for voltage using a multimeter; it should read around 12.6V or higher.
3
Look for any visible damage or corrosion on battery terminals and connections.
4
Verify that the main battery pack is charged; connect to a Tesla charging station if necessary.
5
Perform a soft reset of the vehicle by holding down the brake pedal and pressing the two scroll wheels on the steering wheel until the touchscreen resets.
6
Scan for error codes using a Tesla diagnostic tool to identify any electrical issues.

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
•Wrench
•Small flathead screwdriver

Parts Required

•Key fob battery (CR2032)
•12V battery (if replacement is needed)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Symptoms

•No response when the key fob is used to unlock or start the vehicle

•Dashboard lights are completely off

•No sounds from the vehicle (e.g., clicking or engine noises)

•Key fob not recognized by the vehicle

•Power windows and doors do not operate

•12V battery warning message displayed (if applicable)

Diagnostic Steps

1
Check the key fob battery to ensure it is charged and functioning.
2
Inspect the 12V battery for voltage using a multimeter; it should read around 12.6V or higher.
3
Look for any visible damage or corrosion on battery terminals and connections.
4
Verify that the main battery pack is charged; connect to a Tesla charging station if necessary.
5
Perform a soft reset of the vehicle by holding down the brake pedal and pressing the two scroll wheels on the steering wheel until the touchscreen resets.
6
Scan for error codes using a Tesla diagnostic tool to identify any electrical issues.

Solution

1. Preparation

Ensure the vehicle is parked on a flat surface and the key fob is with you.
Disconnect the negative terminal of the 12V battery for safety before working on electrical components.

2. Replace Key Fob Battery

Sub-steps:
- Use a small flathead screwdriver to gently pry open the key fob.
- Remove the old battery (CR2032) and insert a new one, ensuring the positive side is facing up.
- Reassemble the key fob and test its functionality.

3. Inspect and Replace 12V Battery

Tools Required: Socket set, multimeter, wrench
Sub-steps:
- Reconnect the negative terminal of the 12V battery.
- Use a multimeter to verify voltage; if it's below 12.4V, consider replacing the battery.
- Disconnect the 12V battery by removing the negative terminal first, followed by the positive terminal.
- Remove the old battery and install a new compatible 12V battery (typically an AGM type).
- Reconnect the new battery, first the positive terminal followed by the negative terminal.

4. Check Main Battery Connection

Sub-steps:
- Lift the trunk and inspect the high voltage battery connections for any looseness.
- Ensure all connectors are secure and free of corrosion.
- If any connections are loose, tighten them as required.

5. Reset Vehicle Systems

Sub-steps:
- After completing the above repairs, perform a soft reset again by pressing the brake pedal while holding the scroll wheels until the touchscreen reboots.
- Check if any warning lights reappear on the dashboard.