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

Ford F-150 13th Generation (2015-2020)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0128

4 min read

610 words

Problem Statement

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.

Error Code

P0128

Affected Component

Cooling System

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Allow the engine to cool completely before working on the cooling system to avoid burns.
•Always work in a well-ventilated area and wear appropriate safety gear.

Symptoms

•Check engine light illuminated
•Engine temperature gauge remains low
•Poor fuel economy
•Heater not producing warm air
•Engine runs rough during warm-up

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0128 and check for any related codes.
2
Inspect the engine coolant level and condition; ensure it is at the proper level and not contaminated.
3
Check the thermostat operation by observing engine temperature during warm-up; it should reach normal operating temperature within a few minutes.
4
Verify the coolant temperature sensor readings with a multimeter to ensure it is functioning correctly.
5
Inspect the cooling system for any leaks or blockages that may affect the thermostat's operation.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Socket set
•Torque wrench
•Coolant catch pan
•Pliers
•Multimeter

Parts Required

•New thermostat
•Thermostat gasket (if applicable)
•Engine coolant

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0128 and check for any related codes.
2
Inspect the engine coolant level and condition; ensure it is at the proper level and not contaminated.
3
Check the thermostat operation by observing engine temperature during warm-up; it should reach normal operating temperature within a few minutes.
4
Verify the coolant temperature sensor readings with a multimeter to ensure it is functioning correctly.
5
Inspect the cooling system for any leaks or blockages that may affect the thermostat's operation.

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.