how to fix the Tesla Model 3 Original (2017-2023) key fob not working

Tesla Model 3 Highland (2024-present)

Error Codes

30 minutes

Time

easy

Difficulty

medium

Severity

3 min read

473 words

Problem Statement

Learn how to fix the key fob not working for Tesla Model 3 (2017-2023). Step-by-step guide with diagnostic steps and repair instructions.

Affected Component

Electrical

Estimated Time

30 minutes

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is in a secure location while performing repairs.
•Handle the key fob and battery with care to avoid short circuits or damage.

Symptoms

•Key fob not responding when buttons are pressed
•Vehicle does not unlock when approaching
•"Key not detected" message displayed on the dashboard
•Inability to start the vehicle
•Reduced range of key fob signal

Diagnostic Steps

1
Check the battery level of the key fob.
2
Inspect the key fob for physical damage or wear.
3
Attempt to reprogram the key fob through the vehicle's settings.
4
Test the key fob in close proximity to the vehicle to rule out range issues.
5
Verify if other key fobs are functioning to eliminate vehicle issues.

Solution

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

Parts Required

•CR2032 battery

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Diagnostic Steps

1
Check the battery level of the key fob.
2
Inspect the key fob for physical damage or wear.
3
Attempt to reprogram the key fob through the vehicle's settings.
4
Test the key fob in close proximity to the vehicle to rule out range issues.
5
Verify if other key fobs are functioning to eliminate vehicle issues.

Solution

1. Preparation

Gather necessary tools and components.
Ensure the vehicle is parked and in a safe, accessible location.
Have replacement battery ready if needed.

2. Replace Key Fob Battery

Open the Key Fob:
- Use a small flathead screwdriver to gently pry open the key fob casing.
- Take care not to damage the casing or internal components.
Remove Old Battery:
- Carefully take out the old battery (usually a CR2032).
- Note the orientation of the battery for correct installation of the new one.
Install New Battery:
- Insert the new battery in the same orientation as the old one.
- Ensure it fits snugly in place.
Reassemble the Key Fob:
- Snap the key fob casing back together, ensuring it clicks securely.

3. Reprogram Key Fob (if necessary)

Access Vehicle Settings:
- Sit in the driver’s seat and power on the vehicle.
- Navigate to the 'Controls' menu on the touchscreen.
Select 'Locks':
- Choose the 'Locks' option from the controls menu.
Add Key Fob:
- Follow the prompts to add or reprogram the key fob.
- Press the key fob buttons as instructed by the display.
Test Functionality:
- Verify that the key fob now unlocks the vehicle and starts the engine.