why does my Tesla Model 3 Highland (2024-present) have a rough idle when starting cold?

Solution

1. Preparation

• Ensure the vehicle is parked on a flat surface.
• Gather necessary tools and equipment (OBD-II scanner, laptop with Tesla diagnostics software, and a multimeter).
• Make sure the vehicle is charged adequately before beginning any work.

2. Update Software

• Connect the vehicle to Wi-Fi.
• Access the settings menu and check for available software updates.
• Download and install any updates; the vehicle may require a restart after installation.

3. Battery Inspection

• Access the battery health report through the Tesla service menu.
• Use a multimeter to check the voltage of individual cells if necessary.
• If the battery health is below acceptable levels, consider consulting Tesla for a battery replacement.

4. Check Drivetrain Components

• Inspect the electric motor for any physical damage or signs of wear.
• Ensure all electrical connections to the motor are secure and free of corrosion.
• Apply dielectric grease to connectors to ensure good conductivity.

5. Reset and Recalibrate

• Perform a soft reset of the vehicle by holding down the steering wheel buttons until the screen reboots.
• After rebooting, take the vehicle for a drive to recalibrate the throttle response and motor performance.