What is the code P0128 on a 2004 Ford f150?

The P0128 Code on a 2004 Ford F150
The P0128 code on a 2004 Ford F150 indicates a problem with the engine coolant temperature not reaching its required operating temperature within a certain amount of time after starting the truck. This code can appear as soon as you start your vehicle or while driving. It is important to address this issue immediately, as vehicles with this issue may have increased emissions and decreased fuel efficiency.
Possible Causes and Solutions
The most common cause of the P0128 code on most engines, including the 4.6L engine in the Ford F150, is a thermostat that is stuck open. Here are some possible causes and solutions for the P0128 code:
1. Stuck Thermostat: A stuck thermostat is the most common cause of the P0128 code. To fix this issue, you will need to replace the thermostat. Here’s how to replace the thermostat on the 4.6L F150:
– Remove the air intake tube.
– Drain the coolant from the radiator.
– Remove the thermostat housing.
– Replace the thermostat.
– Reinstall the thermostat housing, air intake tube, and refill the coolant.
2. Low Engine Coolant Level: Insufficient coolant can also cause the P0128 code. Check the coolant level and add coolant if necessary.
3. Malfunctioning Engine Coolant Temperature (ECT) Sensor: A malfunctioning ECT sensor can also trigger the P0128 code. If you suspect a faulty ECT sensor, it is recommended to have it properly diagnosed and replaced if necessary by a qualified mechanic.
4. Malfunctioning Cylinder Head Temperature (CHT) Sensor: In some cases, a malfunctioning CHT sensor can cause the P0128 code. It is best to have the CHT sensor properly diagnosed and replaced if needed by a professional.
It is important to note that diagnosing and repairing the P0128 code may require the use of specialized tools and knowledge. If you are not comfortable diagnosing or repairing this issue yourself, it is recommended to seek assistance from a qualified mechanic or repair shop.
Symptoms of the P0128 Code
The P0128 code may be accompanied by the following symptoms:
– Check Engine Light is on.
– Higher than normal idle.
– Decreased fuel economy.
– The temperature gauge is unusually low.
Cost of Repair
The cost to diagnose and repair the P0128 code can vary depending on factors such as the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour for diagnosis and labor. It is recommended to consult with a qualified mechanic or repair shop to get an accurate estimate for repairs.
I hope this information helps! Let me know if you have any other questions.

How to fix coolant temperature below thermostat regulating temperature?

If the level is under the minimum requirement, add more coolant so the level comes up to the maximum level. Take the car for a short drive and see if the same P0128 fault code comes up. If topping off the coolant doesn’t help, the thermostat should be the next thing to replace.

Where is the coolant temperature sensor located?

Where is the Coolant Temperature Sensor located? The coolant temperature sensor will be located directly behind the coolant pipe. In most modern cars and vehicles, this is present behind the right cylinder head that is located right underneath the air intake pipe.

How do I fix a P0128 code?

How do I fix my Chevy P0128 code?

1. Check the coolant level: If the level is lower than the minimum, add more coolant and go for a short drive.
2. Inspect the coolant temperature sensor: The primary coolant temperature sensor is in the cylinder head near the thermostat.

Can I drive with P0128 code?

How Long Can You Drive with a P0128 Code? Although it may be possible to drive short distances with code P0128 set, you should get the issue fixed by a professional right away. Doing so will help ensure your vehicle keeps running at its best while also helping to prevent any additional damage.

How do I know if my thermostat or sensor is bad?

How to Know if Your Temperature Sensor is Faulty

1. The equipment is experiencing intermittent thermocouple failure.
2. Instruments are showing “Open Circuit”.
3. The temperature gauge on your equipment isn’t reading accurately.
4. The equipment stops heating or cooling properly.
5. The equipment is overheating.

Where is the thermostat sensor located?

Most home thermostats are located in a central location in the home, like a hallway so that the temperature sensed is an average of the total temperature in the home. In most cases the temperature sensor is inside the thermostat but not always.

Will low coolant cause P0128?

So when that thermostat remains fully open that is going to provide maximum Cooling. And potentially not allow the engine to reach its operating temperature at all which is in turn what triggers fault

Will code P0128 reset itself?

This is referred to as a permanent code. This permanent code will go away on its own after the monitor runs and passes. Until then it will be present but only when read with a scan tool and will not turn the light on. If the problem Is detected again by the computer it will first set a pending code.

Is P0128 a thermostat or sensor?

While there is a small chance that there is an issue with the running temperature of your engine, by far the most common issue with trouble code P0128 is a faulty thermostat. The exact location of the thermostat and issues related to a damaged thermostat may vary depending on your vehicle.

How do you unstick an engine thermostat?

This is an easy problem to solve yourself by simply removing the plastic outer casing and, with a very soft brush, delicately brushing off its coil and contact surfaces. It is most effective to clean the thermostat first at its lowest setting, then again at its highest setting.