how to fix P0641 code in Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0641 electrical issue in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Ensure the vehicle is parked on a flat surface and the ignition is off.
• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to prevent any electrical shorts.

2. Inspect Wiring and Connectors

• Tools Required: Electrical connector cleaner, multimeter
• Carefully inspect the wiring harness for any frayed wires, loose connections, or corrosion.
• Clean any corroded connectors using electrical connector cleaner.
• Repair or replace any damaged wiring or connectors as necessary.

3. Check Voltage Output

• Tools Required: Multimeter
• Reconnect the battery and turn the ignition to the "ON" position without starting the engine.
• Use a multimeter to measure the voltage at the reference voltage pin.
• The voltage should typically be around 5 volts. If it is outside the specified range, further testing of the power supply circuit is necessary.

4. Inspect Ground Connections

• Tools Required: Multimeter
• Locate the ground points for the sensors connected to the reference voltage circuit.
• Use the multimeter to test for continuity between the ground points and the vehicle's chassis.
• Clean and secure any loose ground connections.

5. Test Individual Sensors

• Tools Required: Multimeter
• Disconnect each sensor connected to the reference voltage circuit.
• Test each sensor for proper resistance and functionality per manufacturer specifications.
• Replace any faulty sensors that are not functioning correctly.

6. Final Reassembly and Testing

• Reconnect all sensors and wiring harnesses.
• Reconnect the negative battery terminal.
• Clear the P0641 code using the OBD-II scanner.
• Start the vehicle and monitor for any check engine lights or additional codes.