Does P0128 clear itself?
As a seasoned auto service provider at Kevin's Autos, I often encounter questions about diagnostic trouble codes (DTCs) and their implications for vehicle performance. One common code that many drivers come across is P0128, which indicates that the engine coolant temperature is below the expected range for optimal operation. In this article, we will explore whether this code can clear itself and what steps you should take if it appears in your vehicle's system.
Understanding P0128
The P0128 code is triggered when the engine control module (ECM) detects that the engine is not reaching the proper operating temperature within a specified time frame. This can be caused by several factors, including:
- Faulty thermostat
- Coolant leaks
- Faulty temperature sensor
- Low coolant levels
Does P0128 Clear Itself?
In many cases, the P0128 code can clear itself if the underlying issue is resolved. For instance, if the thermostat was stuck open and is replaced, or if the coolant level is restored, the ECM may eventually recognize that the engine is operating within the correct temperature range and clear the code automatically. However, this is not always guaranteed.
Steps to Take If You Encounter P0128
If you see the P0128 code, here are some recommended steps:
- Check Coolant Levels: Ensure that your coolant is at the appropriate level to prevent overheating.
- Inspect the Thermostat: A malfunctioning thermostat may need to be replaced to ensure proper engine temperature regulation.
- Examine the Temperature Sensor: If the sensor is faulty, it may provide incorrect readings to the ECM.
- Clear the Code: After addressing any issues, you can use an OBD-II scanner to clear the code and see if it reappears.
Conclusion
While the P0128 code can sometimes clear itself if the underlying issues are resolved, it is essential to address the root cause to prevent further complications. Regular maintenance and timely repairs can help ensure your vehicle operates efficiently and safely. If you're unsure about how to proceed, don't hesitate to reach out to a trusted auto service provider like Kevin's Autos for assistance.
Frequently Asked Questions
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.
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.
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:
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)
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.
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 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.
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.
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.
