why does my Tesla Model 3 Highland (2024-present) check engine light come on intermittently

Tesla Model 3 Highland (2024-present)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

459 words

Problem Statement

Discover how to diagnose and fix intermittent check engine light issues in Tesla Model 3 Highland (2024-present). Step-by-step guide included.

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always ensure the vehicle is in 'Park' mode and powered down before working on electrical systems.
•Allow the vehicle to cool down if the engine has been running before inspecting wiring or components.

Symptoms

•Intermittent illumination of the check engine light
•Decreased acceleration or power
•Unusual noises from the engine compartment
•Changes in battery performance or range
•Occasional alerts on the vehicle’s touchscreen

Diagnostic Steps

1
Use an OBD-II scanner to retrieve any stored fault codes from the vehicle’s computer.
2
Inspect the vehicle's battery management system for any anomalies or updates.
3
Check for any software updates available for the vehicle via the Tesla app or touchscreen.
4
Examine the wiring and connections related to the engine and battery systems for signs of wear or damage.
5
Monitor the vehicle’s performance data through the Tesla app for unusual patterns or warnings.

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
•Multimeter
•Wire strippers
•Electrical tape

Parts Required

•Replacement wiring (if damaged)
•Electrical connectors (if needed)

Related Faults

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Diagnostic Steps

1
Use an OBD-II scanner to retrieve any stored fault codes from the vehicle’s computer.
2
Inspect the vehicle's battery management system for any anomalies or updates.
3
Check for any software updates available for the vehicle via the Tesla app or touchscreen.
4
Examine the wiring and connections related to the engine and battery systems for signs of wear or damage.
5
Monitor the vehicle’s performance data through the Tesla app for unusual patterns or warnings.

Solution

1. Preparation

Ensure the vehicle is parked on a flat surface and in "Park" mode.
Gather necessary tools and components before starting the repair.

2. Update Software

Sub-steps:
1. Connect the vehicle to Wi-Fi.
2. Access the software update section on the touchscreen.
3. Follow prompts to install any available updates.

3. Inspect and Repair Wiring

Tools Required: Multimeter, wire strippers, electrical tape
Sub-steps:
1. Open the front trunk to access wiring harnesses.
2. Visually inspect wiring for frays or breaks.
3. Use a multimeter to test continuity in suspicious wires.
4. Repair any damaged wires using wire strippers and electrical tape as needed.

4. Clear Fault Codes

Sub-steps:
1. Reconnect the OBD-II scanner.
2. Clear any stored fault codes from the vehicle’s computer.
3. Disconnect the scanner after clearing codes.

5. Test Drive

Sub-steps:
1. Perform a short test drive to monitor for recurring check engine light.
2. Observe vehicle performance during acceleration and braking.