how to fix P0128 code in Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0128 cooling system issue in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

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

2. Inspect and Replace Thermostat

• Tools Required: Socket set, torque wrench, coolant catch pan
• Remove any engine covers or components obstructing access to the thermostat.
• Sub-steps:
  1. Place the coolant catch pan under the engine to capture any leaking coolant.
  2. Disconnect the upper radiator hose from the thermostat housing.
  3. Remove bolts securing the thermostat housing using a socket set.
  4. Carefully lift the thermostat housing and remove the old thermostat.
  5. Clean the mating surfaces of the thermostat housing and engine block to ensure a proper seal.
  6. Install the new thermostat, ensuring the correct orientation.
  7. Reinstall the thermostat housing and secure it with bolts. Torque to manufacturer specifications (typically around 15-20 ft-lbs).
  8. Reconnect the upper radiator hose.

3. Replace Coolant Temperature Sensor

• Tools Required: Socket set, torque wrench
• Sub-steps:
  1. Locate the coolant temperature sensor, typically near the thermostat.
  2. Disconnect the electrical connector from the sensor.
  3. Remove the coolant temperature sensor using a socket set.
  4. Install the new coolant temperature sensor and tighten it to the manufacturer's torque specifications (usually around 10-15 ft-lbs).
  5. Reconnect the electrical connector.

4. Refill Coolant

• Tools Required: Funnel
• Sub-steps:
  1. Fill the coolant reservoir with manufacturer-recommended coolant.
  2. Start the engine and let it idle to circulate the coolant.
  3. Check for leaks around the thermostat housing and sensor.
  4. Top off coolant if necessary.

5. Reconnect Battery

• Reconnect the negative terminal of the battery.