my Tesla Model 3 Original (2017-2023) key fob isn't working what should I do

Tesla Model 3 Highland (2024-present)

Error Codes

30 minutes to 1 hour

Time

medium

Difficulty

medium

Severity

3 min read

438 words

Problem Statement

Learn how to troubleshoot and fix a non-working key fob for Tesla Model 3 (2017-2023). Step-by-step guide with symptoms, diagnostics, and solutions.

Affected Component

Electrical

Estimated Time

30 minutes to 1 hour

⚠️ Safety Warnings

Important safety information - read before proceeding

•Avoid using excessive force when opening the key fob to prevent damage.

Symptoms

•Key fob not recognized by the vehicle
•Unable to lock or unlock doors remotely
•Key fob buttons unresponsive
•Indicator light on the key fob is not illuminating
•Vehicle does not start when key fob is present

Diagnostic Steps

1
Check the battery status of the key fob.
2
Attempt to unlock/lock the vehicle using the mobile app.
3
Inspect the key fob for physical damage or wear.
4
Verify if other key fobs (if available) work with the vehicle.
5
Reboot the car’s touchscreen to reset the vehicle’s systems.
6
Scan for any related error codes using a Tesla diagnostic tool.

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
•New CR2032 battery

Parts Required

•CR2032 battery

Related Faults

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Diagnostic Steps

1
Check the battery status of the key fob.
2
Attempt to unlock/lock the vehicle using the mobile app.
3
Inspect the key fob for physical damage or wear.
4
Verify if other key fobs (if available) work with the vehicle.
5
Reboot the car’s touchscreen to reset the vehicle’s systems.
6
Scan for any related error codes using a Tesla diagnostic tool.

Solution

1. Battery Replacement

Preparation
- Gather tools: small flathead screwdriver, new CR2032 battery.
- Ensure you are in a safe and clean working environment.
Open Key Fob
- Use the flathead screwdriver to gently pry open the key fob along the seam.
- Take care not to damage the casing.
Replace Battery
- Remove the old CR2032 battery from the fob.
- Insert the new battery with the positive (+) side facing up.
Reassemble Key Fob
- Align the two halves of the fob and press them together until they click securely.
- Ensure there are no gaps in the casing.

2. Reprogram Key Fob (if necessary)

Preparation
- Ensure the battery has been replaced successfully.
- Have the vehicle keyless entry system ready for reprogramming.
Initiate Reprogramming
- Inside the vehicle, go to ‘Controls’ > ‘Locks’ from the touchscreen.
- Select “Add Key Fob”.
Follow On-Screen Instructions
- Follow the prompts on the screen to activate the key fob.
- Place the new key fob near the car’s center console as instructed.