how to diagnose Tesla Model Y Current (2020-present) battery problems

Solution

1. Preparation

• Tools Required: Tesla Service Tool, multimeter, torque wrench.
• Safety Warnings: Disconnect the battery before working on electrical systems; allow the battery to cool before handling.

2. Replace Battery Modules (if necessary)

1. Remove the Underbody Shield:

   • Use a socket set to remove bolts securing the underbody shield.
   • Set the shield aside safely.

2. Disconnect Battery Power:

   • Open the frunk (front trunk) and disconnect the 12V battery.
   • Wait for a minimum of 5 minutes to ensure capacitors are discharged.

3. Access Battery Pack:

   • Remove the bolts securing the battery pack cover using a torque wrench. Follow the manufacturer’s specifications for torque values.
   • Carefully lift the cover off and disconnect the electrical connectors.

4. Remove Faulty Battery Module:

   • Identify the faulty module based on diagnostic codes or visual inspection.
   • Disconnect the module’s electrical connectors and remove the securing bolts.
   • Take out the faulty module and set it aside.

5. Install New Battery Module:

   • Place the new battery module into the battery pack housing.
   • Secure it with bolts to the manufacturer's torque specifications.
   • Reconnect the electrical connectors.

6. Reassemble Battery Pack:

   • Replace the battery pack cover and secure it with bolts.
   • Reinstall the underbody shield.

3. Reconnect Battery Power

• Reconnect the 12V battery and close the frunk.