why does my Tesla Model S Original (2012-2020) check engine light keep flashing

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

491 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 a flashing check engine light on your Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before inspecting the cooling system.

Symptoms

•Flashing check engine light
•Reduced engine power or performance
•Unusual engine noises (e.g., knocking or ticking)
•Increased fuel consumption
•Possible overheating warning
•Vehicle may enter limp mode

Diagnostic Steps

1
Scan the vehicle's onboard diagnostic system using an OBD-II scanner to retrieve error codes.
2
Inspect the battery health and range using Tesla's diagnostic tools.
3
Check for any software updates that may address existing issues.
4
Visually inspect the engine bay for any loose or damaged components (wires, hoses, etc.).
5
Test the spark plugs and ignition coils for proper function.
6
Assess the cooling system components for leaks or malfunctions.

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

•OBD-II scanner
•Socket set
•Torque wrench
•Cooling system pressure tester

Parts Required

•Spark plugs
•Ignition coils
•Coolant (specific type for Tesla)

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Diagnostic Steps

1
Scan the vehicle's onboard diagnostic system using an OBD-II scanner to retrieve error codes.
2
Inspect the battery health and range using Tesla's diagnostic tools.
3
Check for any software updates that may address existing issues.
4
Visually inspect the engine bay for any loose or damaged components (wires, hoses, etc.).
5
Test the spark plugs and ignition coils for proper function.
6
Assess the cooling system components for leaks or malfunctions.

Solution

1. Preparation

Gather necessary tools and components.
Ensure the vehicle is parked on a level surface and the ignition is turned off.
Disconnect the 12V battery to avoid electrical shocks.

2. Retrieve and Analyze Diagnostic Codes

Connect the OBD-II scanner to the vehicle's diagnostic port.
Read and note all stored error codes.
Research the codes to identify potential causes and severity.

3. Inspect and Replace Affected Components

Battery Health Assessment
- Check the battery's state of charge and health using Tesla's diagnostics.
- Replace the battery if the health is below acceptable levels.
Inspect Spark Plugs and Ignition Coils
- Remove the ignition coils using a socket set.
- Inspect spark plugs for wear or damage; replace if necessary.
- Reinstall new ignition coils and torque them to manufacturer specifications.

4. Test Cooling System

Inspect the cooling system for leaks or damage.
Replace any faulty components (e.g., coolant pump, thermostat).
Refill the cooling system with the correct type of coolant, ensuring no air pockets are present.

5. Reconnect Battery and Clear Codes

Reconnect the 12V battery.
Use the OBD-II scanner to clear diagnostic codes.
Start the vehicle and monitor the check engine light.