how to troubleshoot Tesla Model S Original (2012-2020) with a malfunctioning key fob

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

30 minutes - 1 hour

Time

medium

Difficulty

high

Severity

3 min read

482 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 troubleshoot and fix a malfunctioning key fob for Tesla Model S (2012-2020). Step-by-step guide with diagnostic steps and solutions.

Affected Component

Electrical

Estimated Time

30 minutes - 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in 'Park' mode before performing any actions.

Symptoms

•Key fob not unlocking the doors
•Vehicle not starting
•Key fob not detected by the vehicle
•Check key fob battery warning message on the dashboard
•Inconsistent or delayed response from the key fob

Diagnostic Steps

1
Check the battery level of the key fob using a multimeter.
2
Replace the battery in the key fob with a new CR2032 battery.
3
Verify if the key fob is within range of the vehicle.
4
Inspect the key fob for physical damage or wear.
5
Attempt to reset the key fob using the Tesla mobile app or vehicle settings.
6
Check for any software updates available for the vehicle that may affect key fob functionality.

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

•CR2032 battery
•Small flathead screwdriver
•Multimeter

Parts Required

•CR2032 battery

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Diagnostic Steps

1
Check the battery level of the key fob using a multimeter.
2
Replace the battery in the key fob with a new CR2032 battery.
3
Verify if the key fob is within range of the vehicle.
4
Inspect the key fob for physical damage or wear.
5
Attempt to reset the key fob using the Tesla mobile app or vehicle settings.
6
Check for any software updates available for the vehicle that may affect key fob functionality.

Solution

1. Preparation

Gather necessary tools and components.
Tools Required:
- CR2032 battery
- Small flathead screwdriver (for prying open the key fob)
- Multimeter (optional, for battery testing)
Safety Warnings:
- Ensure the vehicle is in "Park" mode before performing any actions.

2. Replace Key Fob Battery

Use the small flathead screwdriver to gently pry open the key fob casing.
Remove the old CR2032 battery from the key fob.
- Note the orientation of the battery for correct replacement.
Insert the new CR2032 battery, ensuring the positive side (+) faces the correct direction.
Snap the key fob casing back together securely.

3. Key Fob Reset

If the key fob is still not functioning, open the Tesla mobile app.
Navigate to the "Controls" section and select "Key Fob."
Follow the prompts to remove and re-pair the key fob with the vehicle.
Confirm that the key fob is detected by the vehicle after the reset process.

4. Inspect Key Fob for Damage

Visually inspect the key fob for any cracks, missing buttons, or signs of water damage.
If damage is apparent, consider replacing the key fob with a new one.
Contact Tesla service for key fob replacement if necessary.