Does P0128 clear itself?
The short answer is that the P0128 diagnostic trouble code (DTC) may or may not clear itself, depending on the underlying cause and the vehicle's self-diagnostic capabilities. The P0128 code indicates a problem with the engine coolant temperature (ECT) not reaching the expected temperature within a specified time after the engine is started.
Understanding the P0128 Code
The P0128 DTC is triggered when the engine coolant temperature does not reach a certain threshold within a specified time after the engine is started. This could be due to a variety of issues, such as a faulty thermostat, a problem with the coolant system, or a sensor malfunction. The specific conditions that trigger the P0128 code can vary between different vehicle makes and models.
Will the P0128 Code Clear Itself?
- Intermittent issues: If the underlying cause of the P0128 code is an intermittent problem, such as a faulty connection or a temporary sensor issue, the code may clear itself once the problem is resolved. The vehicle's on-board diagnostics system will typically clear the code after a certain number of successful drive cycles where the problem does not reoccur.
- Persistent issues: If the P0128 code is caused by a more persistent problem, such as a faulty thermostat or a coolant system issue, the code may not clear itself. In these cases, the code will likely remain stored in the vehicle's computer until the underlying issue is diagnosed and repaired.
- Sensor replacement: If the P0128 code is caused by a faulty coolant temperature sensor, replacing the sensor may cause the code to clear itself. However, if the replacement sensor is also faulty or the issue is elsewhere in the cooling system, the code may not clear.
In summary, whether the P0128 code clears itself depends on the specific cause of the problem. If the issue is intermittent or resolved by replacing a faulty sensor, the code may clear itself. However, if the underlying problem persists, the code will likely remain stored in the vehicle's computer until the issue is properly diagnosed and repaired.
Is the code P0128 permanent?
Yes a low coolant level as well as a faulty thermostat can cause a p0128 code to set. On these later model vehicles when they set a code and the code is cleared it keeps a copy of the code stored in the background even tho the engine light is now off. This is referred to as a permanent code.
How do I know if my thermostat or sensor is bad?
Symptoms of bad temperature sensor
- Erratic Readings. Sudden jumps or drops in temperature readings.
- Open Circuit: Display shows a very high or infinite temperature.
- Short Circuit: Display shows a very low or negative temperature.
- Drift:
- Noise or Interference:
- Physical Damage:
Can P0128 go away on its own?
If the engine does reach operating temperature on two consecutive trips after the code is set, the ECM/PCM clears the code and extinguishes the MIL. The cool-running engine condition that triggers a P0128 may or may not incur damage.
Will a stuck thermostat throw a code?
A stuck thermostat will also trigger several indicators, warnings, and fault codes. As you read above, you'll first notice the blue low-temperature indicator that constantly stays on.
Can I unplug coolant temperature sensor?
In summary, unplugging the coolant temperature sensor can disrupt the engine's ability to adjust fuel and ignition timing properly, leading to potential misfiring, rough idling, and poor performance.
How do you free up a stuck 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.
How to clear PO128 code?
Do the following to fix Chevy code P0128. Check the coolant level: If the level is lower than the minimum, add more coolant and go for a short drive. If the code is still active, you must change the thermostat.
Why does my P0128 come on and off?
Causes of a P0128 code include:
A bad coolant temperature sensor. The cooling fan is stuck on. A bad intake air temperature sensor. A thermostat that's malfunctioning or stuck open (electronically controlled or traditional)
Is the code p0128 permanent?
Yes a low coolant level as well as a faulty thermostat can cause a p0128 code to set. On these later model vehicles when they set a code and the code is cleared it keeps a copy of the code stored in the background even tho the engine light is now off. This is referred to as a permanent code.
Can a thermostat go down on its own?
It is uncommon for non-programmable thermostats to change temperature on their own, but there are still a couple of issues that could cause these shifts in your home.
