why does my Tesla Model S Plaid/Refresh (2021-present) key fob not work after replacing the battery

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

30-60 minutes

Time

medium

Difficulty

medium

Severity

3 min read

496 words

Problem Statement

Learn why your Tesla Model S Plaid key fob isn't working after a battery replacement. Follow our diagnostic steps and solutions to fix the issue.

Affected Component

Electrical

Estimated Time

30-60 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in 'Park' mode when working on the key fob.
•Avoid using excessive force when opening the key fob to prevent damage.

Symptoms

•Key fob not recognized by the vehicle
•Vehicle does not unlock when the key fob is near
•Key fob buttons do not respond
•Error message on the vehicle's display indicating an issue with the key fob
•No LED light activation on the fob when buttons are pressed

Diagnostic Steps

1
Verify that the battery is installed correctly, ensuring the positive (+) side is facing the correct direction.
2
Check the battery voltage using a multimeter to ensure it is within the acceptable range (typically around 3V for CR2032 batteries).
3
Inspect the key fob for physical damage or corrosion on the battery contacts.
4
Re-sync the key fob with the vehicle using the Tesla app or vehicle settings.
5
Test the key fob functionality by trying to unlock the vehicle with a different key fob (if available) to rule out vehicle 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

•Small screwdriver
•Multimeter

Parts Required

•CR2032 battery

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Diagnostic Steps

1
Verify that the battery is installed correctly, ensuring the positive (+) side is facing the correct direction.
2
Check the battery voltage using a multimeter to ensure it is within the acceptable range (typically around 3V for CR2032 batteries).
3
Inspect the key fob for physical damage or corrosion on the battery contacts.
4
Re-sync the key fob with the vehicle using the Tesla app or vehicle settings.
5
Test the key fob functionality by trying to unlock the vehicle with a different key fob (if available) to rule out vehicle issues.

Solution

1. Preparation

Gather necessary tools: small screwdriver, multimeter, and a new CR2032 battery.
Ensure the vehicle is in a safe environment and all tools are ready for use.

2. Open the Key Fob

Use the small screwdriver to gently pry open the key fob casing, being careful not to damage the plastic.
Take note of the orientation of the old battery for correct installation of the new battery.

3. Replace the Battery

Remove the old battery from the key fob.
Clean the battery contacts with a soft cloth or contact cleaner to remove any corrosion.
Insert the new CR2032 battery, ensuring the positive (+) side is facing the correct direction.

4. Reassemble the Key Fob

Align the two halves of the key fob casing correctly and press them together until they snap securely.
Check for any gaps indicating improper sealing.

5. Resync the Key Fob

Sit inside the vehicle and use the touchscreen to navigate to the key fob settings.
Follow the prompts to add or resync the key fob, ensuring it recognizes the new battery installation.