If you are getting a P0128 error code, this article is going to show you two practical solutions to fix the error code at home.
Before we get into the solutions, let’s understand what the P0128 error code means. This code indicates that after starting the engine, the powertrain control module has detected that the engine has not reached the required temperature level within a specified amount of time.
Here are two simple DIY methods you can try to solve this problem:
Method A: The ECT Sensor
In most cars, the primary Engine Coolant Temperature (ECT) sensor is installed near the thermostat in the cylinder head. You can remove the ECT sensor from the engine and use a multimeter to proceed a test on the ECT sensor. In an ambient temperature of 68 degrees Fahrenheit, the sensor resistance should be between 2000 ohms and 3000 ohms. If you do not get a reading, this indicates that the ECT sensor is faulty and needs to be replaced.
Method B: The Thermostat
In most cars, the thermostat is placed near the water pump on the cylinder head. Carefully remove the thermostat from the engine (the engine has to be cool before attempting the process) and then install a new thermostat. Make sure to install it correctly with the short end towards the hose and the deep end towards the engine. When you install it back to the engine, ensure the jiggle valve is pointed straight up to the top of the engine so the air can get through the system.
After the repair, you can use the zeus app to clear the error code and make sure everything is fine with your vehicle.
What does the P0128 error code mean?
The P0128 error code means that after starting the engine, the powertrain control module has detected that the engine has not reached the required temperature level within a specified amount of time.
What are the DIY methods to fix the P0128 error code?
There are two DIY methods to fix the P0128 error code: Method A involves testing and potentially replacing the Engine Coolant Temperature (ECT) sensor. Method B involves removing and replacing the thermostat.
How to perform Method A to fix the P0128 error code?
1. Remove the ECT sensor from the engine and test it using a multimeter. The sensor resistance should be between 2000 ohms and 3000 ohms at an ambient temperature of 68 degrees Fahrenheit. If there is no reading, the ECT sensor is faulty and needs to be replaced.
How to perform Method B to fix the P0128 error code?
1. Carefully remove the thermostat from the engine when it is cool. 2. Install a new thermostat with the correct orientation; the short end should go toward the hose and the deep end toward the engine. Ensure the jiggle valve is pointed straight up when installing it back to the engine to allow air to pass through the system.
How to clear the P0128 error code after the repair?
After the repair, you can use the Zeus app to clear the error code and then tap the rescan button to ensure everything is fine with your vehicle.