how to fix B1382 code in Tesla Model S Plaid/Refresh (2021-present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, safety glasses, gloves.
• Ensure the vehicle is parked on a flat surface and the parking brake is engaged.
• Disconnect the high-voltage battery (HV) by removing the service disconnect fuse.

2. Inspect and Repair Battery Connections

• Sub-steps:
  • Open the battery compartment by removing the necessary covers (consult service manual for specifics).
  • Inspect all battery connection points for corrosion or loose connections.
  • Clean any corrosion using a mixture of baking soda and water; rinse and dry thoroughly.
  • Re-torque battery connections to manufacturer's specifications (typically around 10-15 Nm).

3. Test Battery Management System

• Sub-steps:
  • Reconnect the HV battery service disconnect.
  • Use the OBD-II scanner to check for software updates for the BMS.
  • If an update is available, follow the manufacturer's guidelines to perform the update.

4. Replace Faulty Components (if necessary)

• Sub-steps:
  • If battery contactors are found to be defective, carefully remove and replace them.
  • Ensure to torque the new contactors to manufacturer specifications (consult service manual).
  • Reconnect all wiring and ensure secure connections.

5. Reassemble and Test

• Sub-steps:
  • Reinstall all battery compartment covers and ensure they are secure.
  • Reconnect the service disconnect for the HV battery.
  • Perform a system reset using the diagnostic tool and clear the B1382 code.