why does my Tesla Model S Original (2012-2020) check engine light flash when driving

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

high

Severity

3 min read

540 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 in Tesla Model S (2012-2020). 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

•Disconnect the 12V battery before working on electrical components.
•Allow the vehicle to cool before inspecting the cooling system.

Symptoms

•Check engine light flashing intermittently
•Reduced power or acceleration
•Unusual noises from the electric motor or drivetrain
•Possible overheating of the electric motor
•Increased energy consumption
•Warning messages on the vehicle's display

Diagnostic Steps

1
Use an OBD-II scanner to check for any error codes stored in the vehicle's computer system.
2
Inspect the vehicle's battery pack for any visible damage or loose connections.
3
Check the cooling system for the electric motor, including coolant levels and any leaks.
4
Review the vehicle's software version and update if necessary, as outdated software can cause erratic behavior.
5
Monitor battery performance and state of charge to rule out battery-related issues.
6
Verify that all sensors, particularly those related to the powertrain, are functioning properly.

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
•Basic hand tools (screwdrivers, wrenches)
•Torque wrench

Parts Required

•Replacement coolant (if needed)
•Battery terminal cleaner (if corrosion is present)

Related Faults

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Diagnostic Steps

1
Use an OBD-II scanner to check for any error codes stored in the vehicle's computer system.
2
Inspect the vehicle's battery pack for any visible damage or loose connections.
3
Check the cooling system for the electric motor, including coolant levels and any leaks.
4
Review the vehicle's software version and update if necessary, as outdated software can cause erratic behavior.
5
Monitor battery performance and state of charge to rule out battery-related issues.
6
Verify that all sensors, particularly those related to the powertrain, are functioning properly.

Solution

1. Preparation

Gather necessary tools and parts for the repair.
Ensure the vehicle is in a safe location, parked on a level surface.
Disconnect the 12V battery to prevent any electrical shorts.

2. Retrieve and Analyze Diagnostic Codes

Connect the OBD-II scanner to the vehicle's diagnostic port.
Record any error codes and interpret them using manufacturer-specific resources.
Clear the codes and monitor if they return after driving the vehicle briefly.

3. Inspect Battery Pack and Connections

Open the trunk and access the battery compartment.
Inspect for any loose or corroded connections on the battery terminals.
Check for any signs of damage or swelling in the battery pack.

4. Check Cooling System

Inspect the coolant reservoir for appropriate fluid levels.
Check hoses and connections for leaks or damage.
Ensure the cooling fans are operational by observing their function during a short drive.

5. Update Vehicle Software

Connect the vehicle to a Wi-Fi network.
Navigate to the software update section in the vehicle settings.
Install any available updates to ensure the vehicle's systems are functioning optimally.

6. Reconnect Battery and Test Drive

Reconnect the 12V battery and secure all connections.
Perform a test drive to see if the check engine light remains off and monitor performance.