my Tesla Model S Original (2012-2020) won’t start after sitting for a few days why

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

513 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 the no-start issue in Tesla Model S (2012-2020). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the 12V battery before working on electrical systems to avoid electric shock or shorts.
•Allow the vehicle to sit for several minutes after disconnecting the battery to ensure all systems discharge completely.

Symptoms

•No response when pressing the start button
•Key fob not recognized
•Dashboard lights flickering or not illuminating
•12V battery warning message on the display
•Inability to unlock the vehicle remotely

Diagnostic Steps

1
Inspect the 12V battery voltage using a multimeter; it should be above 12.4V.
2
Check for any error messages on the touchscreen display related to the battery or electrical systems.
3
Attempt to unlock the vehicle with the key fob and observe if the vehicle responds.
4
Use an OBD-II scanner to check for any fault codes related to the battery or starting system.
5
Inspect the 12V battery connections for corrosion or looseness.
6
Verify if the main battery pack has sufficient charge; if it is low, check for any charging issues.

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
•OBD-II scanner
•Socket set
•Wrenches

Parts Required

•12V battery

Related Faults

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Diagnostic Steps

1
Inspect the 12V battery voltage using a multimeter; it should be above 12.4V.
2
Check for any error messages on the touchscreen display related to the battery or electrical systems.
3
Attempt to unlock the vehicle with the key fob and observe if the vehicle responds.
4
Use an OBD-II scanner to check for any fault codes related to the battery or starting system.
5
Inspect the 12V battery connections for corrosion or looseness.
6
Verify if the main battery pack has sufficient charge; if it is low, check for any charging issues.

Solution

1. Preparation

Gather tools: multimeter, OBD-II scanner, basic hand tools (socket set, wrenches).
Ensure the vehicle is parked on a flat surface, and the ignition is off.
Disconnect the 12V battery to prevent any electrical shorts.

2. Inspect and Replace the 12V Battery

Remove Battery Cover
- Use a socket set to remove the cover over the 12V battery located in the front trunk.
Disconnect the Battery
- Disconnect the negative terminal first, then the positive terminal using the appropriate socket.
- Inspect terminals for corrosion; clean if necessary.
Test the Battery
- Use a multimeter to check the battery voltage. If it is below 12.0V, replace the battery.
Install New Battery
- Connect the positive terminal first, followed by the negative terminal.
- Ensure connections are tight to prevent any future issues.
Reinstall Battery Cover
- Secure the battery cover back in place and tighten all fasteners.

3. Check for Software Updates

Reconnect 12V Battery
- Reconnect the 12V battery and ensure all connections are secure.
Power On Vehicle
- Press the start button to power on the vehicle.
Check for Updates
- Use the touchscreen to navigate to the software update section and install any available updates.