my Tesla Model S Original (2012-2020) has no power after I turn the key

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

523 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 power loss issues in Tesla Model S (2012-2020). 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 shocks.

Symptoms

•No response from the vehicle upon turning the key
•Dashboard lights remain off
•No sound from the electric motors
•Unable to engage the ignition system
•Key fob unresponsive or not detected

Diagnostic Steps

1
Check the key fob battery to ensure it is functioning properly.
2
Inspect the 12V battery voltage and connections for corrosion or looseness.
3
Verify the main battery pack status using the Tesla app or onboard diagnostics.
4
Check for any blown fuses related to the ignition and power distribution.
5
Connect an OBD-II scanner to check for any fault codes stored in the vehicle's computer.

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
•OBD-II scanner
•Wrench set
•Screwdrivers

Parts Required

•CR2032 key fob battery
•12V battery (if replacement is necessary)
•Replacement fuses (if any are blown)

Related Faults

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Diagnostic Steps

1
Check the key fob battery to ensure it is functioning properly.
2
Inspect the 12V battery voltage and connections for corrosion or looseness.
3
Verify the main battery pack status using the Tesla app or onboard diagnostics.
4
Check for any blown fuses related to the ignition and power distribution.
5
Connect an OBD-II scanner to check for any fault codes stored in the vehicle's computer.

Solution

1. Preparation

Gather tools: multimeter, OBD-II scanner, wrench set, and screwdrivers.
Ensure the vehicle is parked on a level surface and the parking brake is engaged.

2. Check Key Fob Battery

Remove the key fob cover using a small screwdriver.
Replace the old battery with a new CR2032 battery, ensuring correct polarity.
Reassemble the key fob and test it again with the vehicle.

3. Inspect the 12V Battery

Open the front trunk to access the 12V battery.
Use a multimeter to check the voltage; it should read above 12.4V.
If the voltage is low, charge or replace the battery.
Check battery terminal connections for tightness and corrosion. Clean if necessary.

4. Verify Main Battery Pack

Use the Tesla app to check the battery status. Look for any alerts indicating issues.
If the main battery is completely depleted, connect the vehicle to a charging station.

5. Inspect Fuses

Locate the fuse box in the vehicle (consult the owner's manual for location).
Use a fuse puller or pliers to check all relevant fuses for continuity.
Replace any blown fuses with the same amperage rating.

6. Scan for Fault Codes

Connect the OBD-II scanner to the vehicle's diagnostic port.
Follow the scanner's instructions to retrieve any fault codes.
Address any identified issues based on the fault codes.