how to fix Tesla Model S Original (2012-2020) key fob not working

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

30 minutes

Time

medium

Difficulty

high

Severity

3 min read

486 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 a non-working key fob for Tesla Model S (2012-2020). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

30 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure that the vehicle is turned off before working on the key fob.

Symptoms

•Key fob not locking or unlocking doors
•Key fob not allowing the vehicle to start
•Indicator lights on the key fob not illuminating
•Reduced range of key fob functionality
•"Key not detected" message on the vehicle display

Diagnostic Steps

1
Check the battery level of the key fob by replacing it with a new battery.
2
Attempt to use the key fob while standing close to the vehicle to rule out range issues.
3
Inspect the key fob for visible damage, such as cracks or water intrusion.
4
Verify that the vehicle is not in "valet mode," which can restrict key fob functions.
5
Use the Tesla mobile app to check for any alerts or notifications regarding the vehicle's systems.

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
•CR2032 battery

Parts Required

•CR2032 battery

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Diagnostic Steps

1
Check the battery level of the key fob by replacing it with a new battery.
2
Attempt to use the key fob while standing close to the vehicle to rule out range issues.
3
Inspect the key fob for visible damage, such as cracks or water intrusion.
4
Verify that the vehicle is not in "valet mode," which can restrict key fob functions.
5
Use the Tesla mobile app to check for any alerts or notifications regarding the vehicle's systems.

Solution

1. Preparation

Gather necessary tools: small flathead screwdriver, CR2032 battery (for key fob replacement).
Ensure that the vehicle is in a safe location and that you have access to the interior.

2. Replace Key Fob Battery

Open the Key Fob:
- Use a small flathead screwdriver to gently pry open the key fob at the seam.
- Carefully separate the two halves without damaging the clips.
Remove Old Battery:
- Locate the CR2032 battery inside the fob.
- Note the orientation (positive side facing up).
- Replace the old battery with a new CR2032 battery, ensuring correct orientation.
Reassemble Key Fob:
- Align the two halves of the key fob.
- Press together firmly until the clips snap back into place.

3. Reprogram Key Fob (if necessary)

Access Vehicle Settings:
- Sit inside the vehicle with the key fob.
- Use the touchscreen to access "Controls" > "Service" > "Key Fob".
Reprogram the Key Fob:
- Follow the prompts on the touchscreen to reprogram the key fob.
- You may need to press a button on the key fob during this process.