how to fix a Tesla Model S Original (2012-2020) that won't unlock with the key fob

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

507 words

Problem Statement

Learn how to fix the key fob not unlocking issue in Tesla Model S (2012-2020). 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

•Ensure the vehicle is powered off before performing any maintenance.

Symptoms

•Key fob not responding when buttons pressed
•Vehicle not responding to proximity unlock feature
•Key fob indicator light not illuminating
•Vehicle displays 'Key Not Detected' message on the dashboard
•Inconsistent unlocking when using the key fob

Diagnostic Steps

1
Check the key fob battery by replacing it and testing if the vehicle unlocks.
2
Verify if the vehicle's 12V battery is charged and functioning properly.
3
Inspect the key fob for physical damage or signs of wear.
4
Use the Tesla mobile app to attempt unlocking the vehicle remotely.
5
Check for software updates on the vehicle and ensure it is running the latest version.
6
Scan for any error codes related to keyless entry using a Tesla service tool.

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

•Small flathead screwdriver
•Multimeter (optional)

Parts Required

•CR2032 battery (for key fob)

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Diagnostic Steps

1
Check the key fob battery by replacing it and testing if the vehicle unlocks.
2
Verify if the vehicle's 12V battery is charged and functioning properly.
3
Inspect the key fob for physical damage or signs of wear.
4
Use the Tesla mobile app to attempt unlocking the vehicle remotely.
5
Check for software updates on the vehicle and ensure it is running the latest version.
6
Scan for any error codes related to keyless entry using a Tesla service tool.

Solution

1. Preparation

Tools Required: Small flathead screwdriver, new CR2032 battery (for key fob), multimeter (optional).
Safety Warnings: Ensure the vehicle is powered off before performing any maintenance.

2. Replace Key Fob Battery

Use the small flathead screwdriver to gently pry open the key fob casing.
Remove the old CR2032 battery and dispose of it properly.
Insert the new CR2032 battery, ensuring the positive (+) side is facing up.
Reassemble the key fob casing by snapping it back together securely.

3. Check 12V Battery

Open the front trunk (frunk) of the Tesla Model S.
Locate the 12V battery and inspect for corrosion or loose connections.
Use a multimeter to check the voltage of the 12V battery. It should read between 12.4V to 12.6V when fully charged.
If the voltage is low, charge the battery or replace it if necessary.

4. Reset Key Fob Connection

Enter the vehicle and press the brake pedal to power it on.
On the touchscreen, navigate to "Controls" > "Safety & Security" > "Key Fob" settings.
Remove existing key fob entries if any, and then re-add the key fob by following the on-screen instructions.

5. Software Update

On the vehicle touchscreen, navigate to "Controls" > "Software".
Check for available updates and install if necessary.
Restart the vehicle after installation to ensure all systems are refreshed.