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

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

30 minutes to 1 hour

Time

medium

Difficulty

high

Severity

3 min read

518 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 to 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in 'Park' before attempting any repairs.
•Be cautious when using tools to avoid damaging the key fob.

Symptoms

•Key fob not detected by the vehicle
•Inability to unlock or lock doors remotely
•No response when pressing the key fob buttons
•Warning message on the vehicle's display indicating key fob issues
•Reduced range of key fob operation

Diagnostic Steps

1
Check the battery in the key fob using a multimeter to ensure it has sufficient voltage.
2
Replace the key fob battery if the voltage is low or the battery is old.
3
Verify that the key fob is within range of the vehicle.
4
Attempt to reset the key fob by removing the battery and reinserting it after a few minutes.
5
Inspect for physical damage to the key fob casing or buttons.
6
Check for interference from nearby electronic devices that may affect key fob signals.

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

Parts Required

•CR2032 battery

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Diagnostic Steps

1
Check the battery in the key fob using a multimeter to ensure it has sufficient voltage.
2
Replace the key fob battery if the voltage is low or the battery is old.
3
Verify that the key fob is within range of the vehicle.
4
Attempt to reset the key fob by removing the battery and reinserting it after a few minutes.
5
Inspect for physical damage to the key fob casing or buttons.
6
Check for interference from nearby electronic devices that may affect key fob signals.

Solution

1. Preparation

Gather necessary tools and replacement parts.
Ensure that the vehicle is in a safe location and secured.

2. Replace the Key Fob Battery

Locate the Battery Compartment
- Use a small flathead screwdriver to gently pry open the back cover of the key fob.
Remove the Old Battery
- Take note of the battery orientation (positive and negative sides).
- Carefully remove the old battery.
Install the New Battery
- Insert a new CR2032 battery, ensuring the orientation matches the previous battery.
Reassemble the Key Fob
- Snap the back cover back into place until it clicks securely.

3. Reprogram the Key Fob (if necessary)

Enter the Vehicle
- Sit in the driver's seat and ensure all doors are closed.
Put the Vehicle in 'Service Mode'
- On the touchscreen, go to ‘Controls’ > ‘Service’ > ‘Power Off’. Wait for the vehicle to power down completely.
Power the Vehicle Back On
- Press the brake pedal to wake the vehicle.
Re-pair the Key Fob
- Follow the instructions on the touchscreen to add the key fob. This usually involves holding the key fob near the center console until the vehicle acknowledges it.