What does the code p0128 on a check engine light mean?
You hooked up a scan tool to solve the mystery of the check engine light, and it came up with OBD-II trouble code p0128 coolant thermostat is running below the thermostat regulating temperature . So what does the code p0128 mean?
What to do if your coolant temperature is below p0128?
P0128 should be fixed as soon as possible. You’ll have to look at all possible causes to diagnose the problem properly. Have a professional mechanic check your vehicle if you don’t have the required DIY auto repair experience and skills.
What is the diagnostic code for coolant thermostat?
P0128 is a diagnostic trouble code (DTC) for “Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)”. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation.
What does p0128 mean on a Dodge thermostat?
Since this often indicates a problem with the thermostat, regardless if you are driving a Dodge, a Ford, or a Jeep, the P0128 code is likely to appear once your coolant thermostat or temperature sensor fails. Of course, as was mentioned earlier, there are other potential causes for the code, as well.
You hooked up a scan tool to solve the mystery of the check engine light, and it came up with OBD-II trouble code p0128 coolant thermostat is running below the thermostat regulating temperature . So what does the code p0128 mean?
P0128 should be fixed as soon as possible. You’ll have to look at all possible causes to diagnose the problem properly. Have a professional mechanic check your vehicle if you don’t have the required DIY auto repair experience and skills.
P0128 is a diagnostic trouble code (DTC) for “Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)”. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation.
Since this often indicates a problem with the thermostat, regardless if you are driving a Dodge, a Ford, or a Jeep, the P0128 code is likely to appear once your coolant thermostat or temperature sensor fails. Of course, as was mentioned earlier, there are other potential causes for the code, as well.
What causes the Check Engine light to come on and off?
Often this code causes the Check Engine light to come on and off in cold temperatures. – Faulty intake air temperature (IAT) sensor. First, a basic check under the hood must be performed: is the coolant level OK? Is the engine coolant temperature sensor connector free from corrosion and plugged in properly? See the photos below.
When does the PCM record code p0128?
The PCM will record if either of these two criteria is not met. If either fault is recorded again on the next engine startup, code P0128 is triggered. What Are The Symptoms Of P0128? What Is The Cause Of Code P0128? How Serious Is Code P0128? – Low
What causes p0128 in a Jeep Wrangler?
The most common cause for P0128 in a Jeep is the engine coolant thermostat is stuck open. A simple way to diagnose this is to feel the radiator hose and monitor how hot the temperature of the coolant is when it starts flowing through the radiator hose, however, you should be extremely careful when doing this as you could be burned.
What is the code for check engine light?
This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $0.0 .
Often this code causes the Check Engine light to come on and off in cold temperatures. – Faulty intake air temperature (IAT) sensor. First, a basic check under the hood must be performed: is the coolant level OK? Is the engine coolant temperature sensor connector free from corrosion and plugged in properly? See the photos below.
The PCM will record if either of these two criteria is not met. If either fault is recorded again on the next engine startup, code P0128 is triggered. What Are The Symptoms Of P0128? What Is The Cause Of Code P0128? How Serious Is Code P0128? – Low
What causes Mazda 3 to have code p0128?
In some earlier Mazda 3 and Mazda 5 model year vehicles, the code P0128 may be caused by improper calibration of the PCM (engine computer) according to the Mazda service bulletin. The solution is to reprogram the PCM with an updated software and in some Mazda 3s built prior to 2004 also replace the thermostat with an updated part.
What does the you mean on a check engine light?
The letter “U” indicates network codes which are used for problems like module failures and losses of communication. Note: Only professional-grade or dealership scan tools are able to diagnose codes outside of powertrain codes. Step 3: Determine if the codes are Society of Automotive Engineers (SAE) codes or manufacturer-specific.
How to read Check Engine light ( OBD-II ) codes?
The scan tool will power up as soon as it has been plugged in. Step 3: Read the codes in the computer. Each scan tool will have different instructions on how to operate it, so read yours carefully. Navigate to a heading called “Read Codes” and select it. Step 4: Record the codes that display.
In some earlier Mazda 3 and Mazda 5 model year vehicles, the code P0128 may be caused by improper calibration of the PCM (engine computer) according to the Mazda service bulletin. The solution is to reprogram the PCM with an updated software and in some Mazda 3s built prior to 2004 also replace the thermostat with an updated part.
Can a thermostat not fix a p0128 code?
If you ask any mechanic about a P0128 code, most certainly at least 9 out of 10 of them will tell you the thermostat is at fault. The vast majority of the time, they would be right. However, every once in a while it is possible that the thermostat will not fix this code. How serious is the P0128 code? P0128 is not a very serious code.
What’s the difference between p0125 and p0128?
The only difference is that P0125 indicates the engine has not reached sufficient temperature to enter closed loop (PCM feedback control of the onboard system). Unlike P0128, this code can be set by insufficient warm up times. For example, P0125 can be set if you live in a cold climate and only drive short trips.
What should I do if I have a p0128 trouble code?
Your intake air temperature sensor, coolant temperature sensor and coolant fan could also signal this trouble code, so these should be inspected after you look over your thermostat and coolant level. Start with the easiest repair solution, which is low coolant levels.
Why is my Check Engine light illuminated due to p0128?
When your check engine light is illuminated due to trouble code P0128, you may have an issue with your engine thermostat. Here are some helpful steps to take to find out how do I fix trouble code P0128? Learn how to solve this trouble code and repair your thermostat.
What does p0128 mean on a Jeep Cherokee?
Scan your Jeep to verify P0128 is the only code present. If other codes are present, they must be addressed first. Check coolant level and condition. If there is excessive rust and poor coolant condition this can clog up the cooling system or cause the thermostat to stick.
When does an OBD-II trouble code p0128 occur?
The engine control module uses the Engine Coolant Temperature (ECT) sensor to determine whether or not to trigger a OBD-II P0128. When a trouble code P0128 exists by itself, usually a shop technician will suspect a fault engine coolant temperature sensor or stuck open thermostat.
What is the po128 code on my Oldsmobile Alero?
Oldsmobile Alero, 2004, 3.4L V6. I noticed a few days ago that PO128 had popped up and looks like its been tripped a while. I have another code PO401 that I have been tackling for months to no avail, so check engine lights been on non-stop and I missed this new code popping up.
What does the coolant temperature code p0128 mean?
Code P0128 may trigger if the engine control module (ECM) determines that coolant temperature is lower than desired or does not increase quickly enough. What Does Code P0128 Mean?