how to fix my Tesla Model 3 Original (2017-2023) with a malfunctioning key fob

Tesla Model 3 Highland (2024-present)

Error Codes

30 minutes

Time

medium

Difficulty

medium

Severity

3 min read

470 words

Problem Statement

Learn how to diagnose and fix a malfunctioning key fob for Tesla Model 3 (2017-2023). 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

•Be cautious when opening the key fob to avoid damaging internal components.

Symptoms

•Key fob not responding to unlock/lock commands
•Vehicle fails to recognize the key fob when attempting to start
•Key fob battery indicator low or not functioning
•Intermittent connectivity issues with the key fob
•Check key fob message displayed on the vehicle screen

Diagnostic Steps

1
Check the key fob battery level using a multimeter or battery tester.
2
Replace the key fob battery and test functionality.
3
Reboot the vehicle's touchscreen to reset the key fob system.
4
Test another key fob (if available) to determine if the problem is with the key fob or the vehicle.
5
Inspect the key fob for physical damage or signs of moisture intrusion.
6
Check for software updates for the vehicle which 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

•Small flathead screwdriver
•Multimeter
•CR2032 battery

Parts Required

•CR2032 battery (replacement)

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Diagnostic Steps

1
Check the key fob battery level using a multimeter or battery tester.
2
Replace the key fob battery and test functionality.
3
Reboot the vehicle's touchscreen to reset the key fob system.
4
Test another key fob (if available) to determine if the problem is with the key fob or the vehicle.
5
Inspect the key fob for physical damage or signs of moisture intrusion.
6
Check for software updates for the vehicle which may affect key fob functionality.

Solution

1. Preparation

Gather necessary tools: small flathead screwdriver, CR2032 battery (replacement), and a multimeter.
Ensure the vehicle is parked in a safe location and powered off.

2. Replace the Key Fob Battery

Open the Key Fob
- Use the small flathead screwdriver to gently pry open the key fob casing.
Remove the Old Battery
- Take out the old CR2032 battery from the key fob compartment.
Install the New Battery
- Insert the new CR2032 battery, ensuring that the positive (+) side is facing up.
Reassemble the Key Fob
- Press the two halves of the key fob back together until you hear a click.
Test the Key Fob
- Stand within range of the vehicle and press the lock/unlock buttons to verify functionality.

3. Reboot the Vehicle Touchscreen

Power Off the Vehicle
- Put the vehicle in Park and ensure it is completely stopped.
Reboot the Touchscreen
- Hold down both scroll wheels on the steering wheel until the screen turns black and the Tesla logo appears.
Wait for the System to Restart
- Allow the vehicle to fully reboot and check if the key fob functions correctly.