my Tesla Model S Plaid/Refresh (2021-present) shows HVAC error code B0401, what does it mean

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and powered off.
• Disconnect the 12V battery for safety.

2. Inspect and Replace Cabin Air Filter

• Sub-steps:
  1. Locate the cabin air filter access panel, usually under the glove compartment.
  2. Remove the screws or clips securing the panel.
  3. Carefully pull out the old cabin air filter and inspect for dirt or blockage.
  4. Insert the new cabin air filter, ensuring proper orientation.
  5. Reattach the access panel and secure it with screws or clips.
• Tools Required: Screwdriver, new cabin air filter.

3. Test and Replace Blower Motor (if necessary)

• Sub-steps:
  1. Access the blower motor, typically located under the dashboard or in the engine compartment.
  2. Disconnect the electrical connector from the blower motor.
  3. Use a multimeter to test the blower motor for continuity; replace if faulty.
  4. Install the new blower motor and reconnect the electrical connector.
• Tools Required: Multimeter, screwdriver, replacement blower motor.

4. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the 12V battery.
  2. Use the Tesla diagnostic tool to clear the B0401 error code and any other related codes.
  3. Restart the vehicle and monitor HVAC operation.
• Safety Warnings: Ensure that the vehicle is fully powered down and the 12V battery is disconnected before working on electrical components.