how to troubleshoot my Tesla Model S Original (2012-2020) that won’t start after charging

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

586 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 Tesla Model S that won't start after charging. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always disconnect the battery terminals before working on electrical systems.
•Ensure the vehicle is turned off before attempting repairs.

Symptoms

•Vehicle does not power on when the start button is pressed
•Dashboard displays error messages or warning lights
•No sound or clicking noise when attempting to start
•Key fob not recognized by the vehicle
•Battery charge shows full but vehicle remains unresponsive

Diagnostic Steps

1
Check the key fob battery and functionality to ensure it is transmitting a signal.
2
Verify the 12V battery health using the Tesla app or onboard diagnostics.
3
Inspect the charging connector and port for any signs of damage or corrosion.
4
Check for any software updates available for the vehicle via the Tesla app.
5
Attempt a soft reset of the vehicle by holding down the brake pedal and pressing both scroll wheels on the steering wheel.
6
Scan for error codes using Tesla's diagnostic tools or through the mobile app.

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

•Multimeter
•Tesla diagnostic tool (if available)
•Screwdriver for key fob battery replacement

Parts Required

•CR2032 key fob battery
•12V battery (Group 24F compatible)

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Diagnostic Steps

1
Check the key fob battery and functionality to ensure it is transmitting a signal.
2
Verify the 12V battery health using the Tesla app or onboard diagnostics.
3
Inspect the charging connector and port for any signs of damage or corrosion.
4
Check for any software updates available for the vehicle via the Tesla app.
5
Attempt a soft reset of the vehicle by holding down the brake pedal and pressing both scroll wheels on the steering wheel.
6
Scan for error codes using Tesla's diagnostic tools or through the mobile app.

Solution

1. Preparation

Ensure the vehicle is parked in a safe, well-ventilated area.
Disconnect the charging cable from the vehicle.
Gather necessary tools: multimeter, Tesla diagnostic tool (if available), and a replacement key fob battery.

2. Key Fob Battery Replacement

1.1 Remove the key fob cover by gently prying it open.
1.2 Replace the old battery with a new CR2032 battery, ensuring the positive side is facing up.
1.3 Reassemble the key fob and test its functionality by approaching the vehicle.

3. 12V Battery Inspection and Replacement

2.1 Open the front trunk (frunk) and locate the 12V battery.
2.2 Use a multimeter to check the voltage of the 12V battery; it should be above 12.5V.
2.3 If the voltage is low, disconnect the battery terminals (negative first, then positive).
2.4 Replace the 12V battery with a new one (ensure it is compatible; typically a Group 24F).
2.5 Reconnect the battery terminals (positive first, then negative) and test the vehicle.

4. Software Update

3.1 Connect to Wi-Fi via the vehicle's touchscreen.
3.2 Go to 'Software' in the menu and check for updates.
3.3 If an update is available, follow the prompts to install it.

5. Soft Reset

4.1 Press and hold the brake pedal.
4.2 Press both scroll wheels on the steering wheel until the screen goes dark and then light up again.
4.3 Allow the system to reboot and check if the vehicle responds.