how to fix the P0128 code in my Ford F-150 13th Generation (2015-2020)

Learn how to diagnose and fix P0128 code in Ford F-150 (2015-2020). Step-by-step guide with symptoms, diagnostic steps, 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 battery terminal to prevent electrical issues.

2. Replace the Thermostat

• Tools Required: Socket set, torque wrench, coolant catch pan, pliers.
• Sub-steps:
  1. Locate the thermostat housing, usually found on the engine block near the upper radiator hose.
  2. Remove the hose clamp using pliers and detach the upper radiator hose from the thermostat housing.
  3. Unscrew the bolts securing the thermostat housing with a socket set and remove the housing.
  4. Carefully take out the old thermostat and inspect for signs of damage or sticking.
  5. Clean the mating surfaces of the thermostat housing and engine block to ensure a proper seal for the new thermostat.
  6. Install the new thermostat in the correct orientation (usually marked) and reattach the thermostat housing.
  7. Torque the housing bolts to the manufacturer's specifications (typically around 15-22 lb-ft).
  8. Reattach the upper radiator hose and secure it with the hose clamp.

3. Refill Coolant

• Sub-steps:
  1. Using a coolant catch pan, drain any excess coolant from the system if necessary.
  2. Refill the cooling system with the appropriate type of coolant (check owner’s manual for specifications) until the correct level is reached.
  3. Bleed the cooling system to remove any trapped air, which may involve running the engine with the radiator cap off until it reaches operating temperature and topping up coolant as needed.

4. Reconnect Battery

• Reconnect the negative battery terminal after all repairs and coolant refilling are complete.