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

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

497 words

Problem Statement

Discover how to diagnose and fix the check engine light issue on your Tesla Model S (2012-2020). Step-by-step guide with symptoms and solutions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the vehicle to cool down before inspecting components.

Symptoms

•Check engine light illuminated
•Reduced power or acceleration
•Unusual sounds from the electric motor
•Increased charging time
•Notifications on the dashboard regarding vehicle performance

Diagnostic Steps

1
Connect an OBD-II scanner to retrieve any fault codes stored in the vehicle's computer.
2
Review the fault codes for specific issues related to the electric motor, battery, or other systems.
3
Inspect the high-voltage battery for any signs of damage or wear.
4
Check the connections and wiring for loose or corroded terminals.
5
Perform a visual inspection of the electric motor and associated components for any obvious issues.
6
Update the vehicle's software to ensure all systems are functioning with the latest improvements.

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
•Wire brush
•Multimeter

Parts Required

•Replacement battery terminals (if corroded)
•Wiring harness (if damaged)

Related Faults

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Diagnostic Steps

1
Connect an OBD-II scanner to retrieve any fault codes stored in the vehicle's computer.
2
Review the fault codes for specific issues related to the electric motor, battery, or other systems.
3
Inspect the high-voltage battery for any signs of damage or wear.
4
Check the connections and wiring for loose or corroded terminals.
5
Perform a visual inspection of the electric motor and associated components for any obvious issues.
6
Update the vehicle's software to ensure all systems are functioning with the latest improvements.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the parking brake is engaged.

2. Retrieve Fault Codes

Connect the OBD-II scanner to the vehicle’s diagnostic port.
Turn on the vehicle without starting the engine.
Follow the scanner instructions to read and document any fault codes.

3. Address Battery Issues

Inspect High-Voltage Battery:
- Remove the battery cover if accessible.
- Check for any signs of swelling, corrosion, or damage.
Reconnect and Secure:
- Disconnect the battery terminal using a socket set.
- Clean the terminals with a wire brush.
- Reconnect securely ensuring no loose connections.

4. Check Wiring and Connections

Inspect all wiring connected to the electric motor and battery.
Look for frayed wires, corrosion, or loose connections.
Repair or replace any damaged wiring as necessary.

5. Software Update

Connect the vehicle to Wi-Fi and check for any available software updates.
Follow on-screen prompts to install updates.
Restart the vehicle after updates are complete.

6. Test Drive

After repairs, take the vehicle for a test drive to ensure the check engine light does not reappear.
Monitor performance and check for any unusual sounds or behaviors.