Jeep error code p0128 - The P0128 code on a 2015 Jeep Wrangler typically indicates a problem with the engine coolant temperature. To fix this issue, it is recommended to first check the coolant level and ensure it is at the proper level. If the coolant level is low, topping it off may resolve the issue. However, if the coolant level is fine, the thermostat may need to ...

 
How to Diagnose P0128 Thermostat Issues on a Jeep? When your Jeep has a P0128 code, use these steps to diagnose the root cause: Use an OBD2 Scanner Tool. Plug in a diagnostic scan tool to pull the P0128 code and any other related trouble codes from the engine control module (ECM). This will confirm the issue is a faulty thermostat regulation one.. Medtronic employment verification

Pulled the code and yup, P0128. Heat is working great so I cleared the code since the light just irritates me and have been looking for the best place for the mopar part . Then today, low 40s and a strong headwind again and it came back on. Same code so a thermostat replacement is in order Sent from somewhere in MissouriWhen it comes to troubleshooting my Jeep and understanding error codes, one of the common issues that I have encountered is the P0128 error code. This code,Possible Causes of Jeep code P0128. There are several potential causes for the Jeep code P0128, including: A faulty thermostat: The thermostat plays a crucial role in regulating the flow of coolant through the engine. If it is stuck open or partially open, it can prevent the engine from reaching the required operating temperature.Before getting into in-depth knowledge about the P0128 Code, first of all, know what does a P0128 means and how it works in your car. Don’t worry we are here to explain how long can you drive with a P0128 code. P0128 is telling your fix sensor that your car’s coolant thermostat is operating below the regulating temperature.12136. Don't forget to disconnect the battery while you replace the sensor (or for 10-15 minutes). This will reset the P0128 code. Otherwise, it will take several normal drive cycles for the CEL to go out. Good luck :thumbsup: ...Sometimes, the more you see, the less you understand... I miss my Jeep.WK2 -Trouble Shooting/Problems/Service ... Engine temp 120 p0128 code. ... Just bought a 2015 jeep grand Cherokee last week with 99k miles. It is the 3.6L v6.Low coolant levels, a stuck engine coolant thermostat, and issues with the coolant temperature sensor or its wiring can cause code P0128. Symptoms of the …Jan 24, 2024 · To diagnose and fix the P0128 code on a 2015 Jeep Grand Cherokee, follow these steps: 1. Check the coolant level: Ensure that the coolant is at the correct level. If it is low, refill it to the recommended level. 2. Inspect the thermostat: A faulty thermostat can trigger the P0128 code. The symptoms of the automobile fault code P0480 include: 1. Malfunctioning cooling fan 2. Overheating engine 3. Engine temperature gauge showing high readings 4. Reduced air conditioning performance 5. Check Engine Light illuminated 6. Engine stalling or running rough 7. Decreased fuel efficiency 8.Parts I used:Jeep Grand Cherokee Thermostat https://amzn.to/2tHPqXiCheck Engine Light P0128 Jeep Grand Cherokee Thermostat Replace. Step by step how to. Part...Jeep Grand Cherokee P0128 Code. Cherokee fault p0335 codes crankshaft 02 jeep grand cherokee 4.7. dead miss started suddenly. have codes Jeep p0455 cherokee grand codeP0128 code. If you’ve noticed the P0128 code on your engine codes com, you might be wondering why it came on. While the code isn’t a serious issue, it will cause your car’s engine to run colder than usual. Additionally, it can cause fuel economy to drop, and the engine may begin to damage over time.The most common causes of Ford Code P0128 include: A malfunctioning ECT sensor. A stuck-open thermostat. A faulty engine coolant temperature sensor connector. A low coolant level or coolant leak. An issue with the engine’s cooling system. Identifying the root cause of the code is essential for an accurate diagnosis and efficient …Dec 7, 2023 · A P0128 code in a Jeep is caused by an engine coolant temperature (ECT) sensor that is not reaching the predetermined temperature within a certain amount of time. You’ll also notice this in other vehicles besides Jeeps, such as the P0128 code in a Honda Civic. The ECT sensor monitors the engine’s operating temperature and sends a signal to ... OBD II codes or Diagnostic Trouble Codes (DTCs) are one of the most common ways for mechanics to identify and diagnose car issues quickly. One such code is P0128, which has been reported to be a common issue in Jeep Grand Cherokees. In this post, we will look at what P0128 is, its causes, and how to troubleshoot and fix the issue.Fixing P0128 in the Jeep Renegade is usually a pretty easy thing to do since, 90% of the time, a stuck thermostat will cause the problem. Here are the most common causes of P0128: Thermostat Stuck Open – Far and away, the most typical cause for the P0128 code is a thermostat that is stuck open. When a thermostat is stuck open, it allows ...Top Causes of a P0128 Code or a Radiator Fan That Won’t Turn Off. If there is an issue with any of these parts, the computer can turn the radiator cooling fans on high to prevent the engine from overheating. 1. Overheating Engine. The engine could be overheating from a problem with the cooling fans. This can be noticeable at idle, which is ...The most common symptom of a P0128 trouble code in a Jeep Wrangler is an illuminated malfunction indicator lamp (MIL). Other symptoms may include poor engine performance and a decrease in fuel economy.How to change the thermostat on the 2015-2022 Jeep Grand Cherokee 3.6L v6. Check engine code P0128. IG: Ljs_Garage_548 posts · Joined 2014. #1 · Feb 17, 2020. Hi all. I got DTC code P0128 this morning - probably stuck thermostat. 2015 JKU with almost 80K... so probably it's time. Jeep is covered with lifetime powertrain warranty.If you have a Jeep P0128 code, you must first diagnose the problem. Engine temperatures can be calculated and analyzed using the live data functionality of the FIXD sensor and app. RepairPal-certified shops have a minimum 12-month warranty on all repairs lasting 12,000 miles or more. It is possible that some repairs will be required to …Jeep Code P0128 means that your Engine Coolant Temperature is below the thermostat regulating temperature. Simply put, the coolant which helps regulate your engine’s temperature is colder than it should be. What happens as a consequence is that your engine will be running colder.P0128-THERMOSTAT RATIONALITY. Theory of Operation. The PCM predicts what the engine coolant temperature should be, based on the engine coolant temperature at start-up, ambient temperature and how the vehicle is subsequently driven. The predicted engine coolant temperature is compared to the Engine Coolant Temperature Sensor reading.Here are the most common causes of P0128: Thermostat Stuck Open – Far and away, the most typical cause for the P0128 code is a thermostat that is stuck open. When a thermostat is stuck open, it allows coolant to flow through the engine at all times. When this happens, the engine is “over-cooled” and never reaches the proper operating ...Its a 10mm and about 2 minutes of time to unhook a battery cable, thermo was stuck wide open as they are designed to fail that way and not closed. Heater will cook a steak with a new one installed. Reset it and forget about it, ive done a few of these over the years, always a p0128 especially if you let it idle before you drive it.The most common symptom of a P0128 trouble code in a Jeep Compass is an illuminated malfunction indicator lamp (MIL). Other symptoms may include poor engine performance and a decrease in fuel economy. Lack of heat– The most prominent symptom of the P0128 trouble code in the Jeep Compass is the lack of heat. When the thermostat doesn’t bring ...Feb 11, 2024 · For troubleshooting the P0128 code in your Jeep Wrangler, follow the steps as mentioned below: Manage an OBD-II scanner. Plug the scanner in the port, which is placed above the pedals on the left side of your Jeep Wrangler. Put the key to turn on the vehicle and then press the Read button on the scanner. Press on the Erase or Clear button and ... The most common symptom of a P0128 trouble code in a Jeep Cherokee is an illuminated malfunction indicator lamp (MIL). Other symptoms may include poor engine performance and a decrease in fuel economy. Lack of heat– The most prominent symptom of the P0128 trouble code in the Jeep Cherokee is the lack of heat. When the thermostat doesn’t ...Also, do the idler and tensioner pullies at the same time. That P0128 code is indicating your coolant is below regulating temperature., however that as a fact is highly unlikely, this usually means a malfunctioning temperature sensor. but can also mean a bad thermostat, wiring issues, or very low coolant.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. Inspect the coolant temperature sensor: The primary coolant temperature sensor is in the cylinder head near the thermostat.Seeing the "Error establishing a database connection" is the definition of a bad day as a WordPress website owner. Here are five easy steps to fix it ASAP. Karol Krol Staff Writer ...P0128 is a generic powertrain code that means the engine control module (ECM) detected that the motor hadn’t reached its required operating temperature within …Volkswagen (VLKAF) errors on emissions testing find a familiar fault....VLKAF Volkswagen AG (VLKAF) is finding a familiar fault with its emissions testing on Wednesday. While the s...WK2 -Trouble Shooting/Problems/Service ... Engine temp 120 p0128 code. ... Just bought a 2015 jeep grand Cherokee last week with 99k miles. It is the 3.6L v6.When it comes to diagnosing engine problems in a Dodge, error codes can be a great tool to help you understand what is going on. Error codes are the first step in diagnosing any en...Follow up to the original question. My CEL has been on for a few days. Finally scanned last night and got the same code P0128. Coolant was pretty low, but not below the add line. I went ahead and topped off the coolant. Was hoping that's the simple fix before replacing the thermostat. The jeep is running fine, all the temperatures seem normal.576 posts · Joined 2014. #1 · Dec 21, 2016. CEL p0128 code 'coolant temp below thermostat regulating temp'. This would show up on cold days. So I thought my IAT may be bad, so for $20 I changed that, but I am still getting the CEL and , in addition, code p0113 'IAT sensor 1 circuit high input'.A defective sensor, malfunctioning thermostat, improper fan operation, or poor coolant circulation could all cause the P0128 code to be set. In this article, we'll …Its a 10mm and about 2 minutes of time to unhook a battery cable, thermo was stuck wide open as they are designed to fail that way and not closed. Heater will cook a steak with a new one installed. Reset it and forget about it, ive done a few of these over the years, always a p0128 especially if you let it idle before you drive it.P0128 Thermostat Rationality. P0128 JEEP. Description. Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine. Symptoms- CEL. Possible causes. - Insufficient warm up time. - Low engine coolant level. - Leaking or stuck open thermostat.P0128 can be caused by a bad thermostat OR the Coolent Temperature Sensor being faulty. After much research, I decided it was the sensor, not the thermostat. Depending on whether you have a 3.6 or 3.8, the sensor is either right next to the thermostat (replace from above) or in the block near the firewall on the driver's side (replace through ...Updated: July 31, 2021. The code P0128 - Coolant Temperature Below Thermostat Regulating Temperature means that the engine does not reach expected temperature after running for sufficient time, or in other words, it takes too long to warm up. Often this code causes the Check Engine light to come on and off in cold temperatures.To reset the p0128 code on a jeep wrangler, disconnect the battery for a few minutes and then reconnect it. When the code reappears, it indicates a persistent issue that needs to be fixed. The p0128 code is related to the engine coolant temperature being below the expected range. This could be caused by a faulty thermostat, a coolant leak, or a ...Jeep Code P0128 means that your Engine Coolant Temperature is below the thermostat regulating temperature. Simply put, the coolant which helps regulate your engine’s temperature is colder …Parts I used:Jeep Grand Cherokee Thermostat https://amzn.to/2tHPqXiCheck Engine Light P0128 Jeep Grand Cherokee Thermostat Replace. Step by step how to. Part...Discover quick fixes and expert insights for the 'P0128 Jeep' code. Get your Jeep running smoothly again with our helpful tips!If you own an LG dishwasher, you may have encountered the error code AE at some point. This error code is an indication that something is wrong with your dishwasher and needs atten...P0128 Jeep Wrangler thermostat and housing replace diy. Code P0128 could be either the thermostat or the coolant sensor .Today I replaced the thermostat on o...My 2012 JGC with the 3.6L engine just lit up a CEL with a code P0128. Based upon the postings here, it seems pretty common that the thermostat needs to be replaced. I purchased the thermostat at the dealer today and was pretty shocked by the $75 (out the door) price. Amazon and others that sell OEM show ~$40 with free shipping.Share. mrpittman. • 2 yr. ago. So this code means one of two things, either the thermostat is bad but you changed it so now the sensor needs to be replaced. That will fix it, temp sensor drivers side of the block towards the back its going to make a mess because its at the lowest point but get your tools and clear an area and you'll be fine ...Best car modif 2011: jeep wrangler unlimitedJeep wrangler how to replace thermostat code p0128 thermostat P0128 code on 2013 jeep wrangler, changed thermostat, but still see2010 jeep wrangler code p0456.P0128 is a generic powertrain code that means the engine control module (ECM) detected that the motor hadn’t reached its required operating temperature within …The engine code P0128 in a Jeep Wrangler refers to a faulty thermostat or coolant temperature sensor. It indicates that the engine is not reaching its operating temperature within a specified time frame. Causes of Engine Code P0128 in a Jeep Wrangler. The potential causes of engine code P0128 in a Jeep Wrangler can include:Feb 22, 2024 · The P0128 code can be set while the PCM is monitoring engine warm-up. The PCM draws from a few key pieces of data during this time to maximize engine efficiency, including the Engine Coolant ... How to Diagnose P0128 Thermostat Issues on a Jeep? When your Jeep has a P0128 code, use these steps to diagnose the root cause:. Use an OBD2 Scanner Tool. Plug in a diagnostic scan tool to pull the P0128 code and any other related trouble codes from the engine control module (ECM).This will confirm the issue is a faulty thermostat …2016 wrangler p0128. Got a 2016 wrangler with the 3.6l getting a code p0128. question the temp sensor cause it warms up fast and is normal on the gauge dash says 190 normal driving but got up to 220 today sitting and the fan never kicked on. Question is what is the normal operating temperature saw somewhere the fan won’t kick on till 240?So my check engine light came on and ran the codes. The ones that come up are P0118, P2181 and P0128 and I am a little confused as to how to fix these errors. Back in the fall, the P0128 code came up and I changed the Termostat. All was well. Fast forward to now - The P0128 Code came back up along with the P2181 and the P0118 Code.Feb 11, 2022 · P0128 Jeep Wrangler thermostat and housing replace diy. Code P0128 could be either the thermostat or the coolant sensor .Today I replaced the thermostat on o... Jun 14, 2020 · How to Fix. What does this mean? Possible Causes. NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes. Leaking or stuck open thermostat. Low engine coolant level. Insufficient warm up time. Faulty engine coolant temperature sensor. 2. The next cause is a problem with the engine coolant temperature sensor or the wiring associated with the sensor. There are two main symptoms for the P0128 code: 1. Heater is not hot enough due to the coolant temperature in the engine being low 2. Car takes too long to warm up, or the temperature gauge does not go up as high as it used to. What are the common causes of code P0128? Code P0128 is most likely caused by one of the following: (1) Improper coolant level/mixture (2) Faulty cooling fan (3) Faulty coolant temperature sensor (ECT) (4) Stuck open thermostat. What are the symptoms of code P0128? The description for code P0128 is “coolant thermostat (coolant temperature ...The P0128 code can be set while the PCM is monitoring engine warm-up. The PCM draws from a few key pieces of data during this time to maximize engine efficiency, including the Engine Coolant ...Bosch washers are amazing appliances — until an error code pops up and they don’t work as they should. Fortunately, some error codes may have simple solutions you can do on your ow...Apr 19, 2019 ... So I have yet another Jeep Dodge Chrysler in the shop with the P0128. I wanna go over a few tips you should follow before replacing the ...What Does p0128 Jeep Grand Cherokee mean? The basic meaning of p0128 is the issue with the coolant thermostat temperature. When this code is triggered, the coolant thermostat temperature is below the regulating temperature. The primary cause for this DTC can be an open thermostat, damaged wearing, or a faulty coolant temperature sensor.HI @Jonathan, The P0128 code is very common. Your Cherokee's computer knows how long it should take for the car to warm up. Using the sensors that measure the air temp (ambient) as well as the temperature of the coolant, if the computer finds a deviation from what it expects or the value is completely out of bounds from what it should be (rationality), it illuminates the CEL and saves a P0128 ...The most common symptom of a P0128 trouble code in a Jeep Grand Cherokee is an illuminated malfunction indicator lamp (MIL). Other symptoms may include poor engine performance and a decrease in fuel economy. Lack of heat– The most prominent symptom of the P0128 trouble code in the Jeep Grand Cherokee is the lack of heat. When the thermostat ...Jun 17, 2023 · The most common cause for the P0128 code on a Jeep Wrangler is a faulty thermostat. A faulty thermostat can be what is described as a "stuck open thermostat." Other issues can be low coolant, a bad radiator fan or water pump, an inaccurate engine coolant temperature sensor (ECT sensor), or a bad engine control module. Check Out The Latest Price! Dec 7, 2023 · A P0128 code in a Jeep is caused by an engine coolant temperature (ECT) sensor that is not reaching the predetermined temperature within a certain amount of time. You’ll also notice this in other vehicles besides Jeeps, such as the P0128 code in a Honda Civic. The ECT sensor monitors the engine’s operating temperature and sends a signal to ... The most common symptom of a P0128 trouble code in a Jeep Patriot is an illuminated malfunction indicator lamp (MIL). Other symptoms may include poor engine performance and a decrease in fuel economy. Lack of heat– The most prominent symptom of the P0128 trouble code in the Jeep Patriot is the lack of heat. When the thermostat doesn’t bring ...The MLB season is falling apart. The same fate will befall the NFL in September if it doesn't drastically reimagine its return protocol. The Major League Baseball season is falling...Is your Maytag dishwasher displaying error codes and causing disruptions in your daily routine? Don’t worry, as this article will guide you on how to reset Maytag dishwasher error ...The P0128 code in your 2014 Jeep Grand Cherokee indicates a potential issue with the engine coolant temperature (ECT) sensor or thermostat. To diagnose the cause, you can perform the following steps: 1. Start by checking the coolant level and make sure it is at the proper level. 2.What can you do if there's a negative mark on your credit report that was placed there in error, through no fault of your own? Follow these steps to fix it. Your credit report and ...Nov 5, 2018 · The most common symptom of a P0128 trouble code in a Jeep Patriot is an illuminated malfunction indicator lamp (MIL). Other symptoms may include poor engine performance and a decrease in fuel economy. Lack of heat– The most prominent symptom of the P0128 trouble code in the Jeep Patriot is the lack of heat. When the thermostat doesn’t bring ... Oct 28, 2023 · How to Diagnose P0128 Thermostat Issues on a Jeep? When your Jeep has a P0128 code, use these steps to diagnose the root cause: Use an OBD2 Scanner Tool. Plug in a diagnostic scan tool to pull the P0128 code and any other related trouble codes from the engine control module (ECM). This will confirm the issue is a faulty thermostat regulation one. The Jeep Renegade (BU) is a subcompact crossover SUV from the Jeep division of Fiat Chrysler Automobiles. It is built in Melfi, Italy alongside the related Fiat 500X, with which it shares its platform. ... It's been a good vehicle except for a continued issue related to P0128 fault code. The code first showed up about a year and a half ago ...Low coolant levels, a stuck engine coolant thermostat, and issues with the coolant temperature sensor or its wiring can cause code P0128. Symptoms of the …Jeep Code P0128 means that your Engine Coolant Temperature is below the thermostat regulating temperature. Simply put, the coolant which helps regulate your engine’s temperature is colder …In this video, I'll explain what the P0128 Coolant Thermostat Error Code means when your check engine like goes on and you get this code. Another name is P01...So, what does the code P0128 mean? You’ll likely see your malfunction indicator lamp illuminate. You may also experience a longer amount of time for your engine to warm up, or the temperature dropping while you’re driving at high speeds.How to replace a thermostat. 2.4L, & 2.0L. 2014-2018 Jeep Cherokee, and 2013-2016 Dodge dart uses the same part. Same engine. Car had check engine light on. ...Code Fault Location Probable Cause; P0128: Coolant thermostat -coolant temperature below thermostat regulating temperature (Buy Part On Amazon) ... I have a 2012 jeep wrangler it posted a code of P0128 for about three days and then it went away is there still a problem. 0. Reply. Michael Shellito.Some of the error codes that appear on a Whirlpool Duet include error code “F/H,” which means there is no water detected; error code “F/02,” which means draining takes more than 8 ...Nov 5, 2018 · The most common symptom of a P0128 trouble code in a Jeep Cherokee is an illuminated malfunction indicator lamp (MIL). Other symptoms may include poor engine performance and a decrease in fuel economy. Lack of heat– The most prominent symptom of the P0128 trouble code in the Jeep Cherokee is the lack of heat. When the thermostat doesn’t ... If your car is showing the P0128 engine code, there is likely an issue with a leaking cooling system or thermostat. A malfunctioning coolant thermostat is the most common cause of this engine code. The coolant thermostat is responsible for blocking the coolant from entering the radiator until the engine reaches the correct temperature.Error code P0128 on your Jeep indicates a possible issue with the engine’s coolant temperature being too low. To diagnose and fix this, check the coolant level and condition, inspect the thermostat, and test the coolant temperature sensor.

2. Turn the ignition key to the “on” position without starting the engine. 3. Access the scanner’s menu and select “Read Codes” to retrieve the P0128 code. 4. After reading the code, select “Clear Codes” or “Erase Codes” option on …. Restaurants on hospitality san bernardino

jeep error code p0128

Guide on the Jeep Compass P0128 fault code. If your Jeep Compass is experiencing the P0128 code, it indicates a potential issue with the engine coolant temperature. Understanding the causes and solutions is crucial for maintaining your vehicle's optimal performance. Below, explore in-depth insights into diagnosing and resolving the P0128 …Apr 4, 2023 · 1) Warm engine up for five minutes (must reach closed loop) 2) Drive (with steady throttle) at a speed between 40 and 60 mph for 8 minutes. 3) Stop and idle for 3 minutes. 4) Drive (with steady throttle) at a speed above 20 mph for 2 minutes. 5) Turn key off, leave off for ten minutes (to run O2 sensor heater monitor). 4-Wheel drives and off-road driving techniques has been my passion for over 20 years. My goal is to provide the most accurate, up-to-date, helpful information about 4WD functionality, common faults and latest technology built into most 4-Wheel Drives.Fault Code P0128 advice. Hi all... got a P0128 fault this morning. Using Torque and a cheap bluetooth OBD reader, Torque states: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature). Ensured radiator and reservoir were appropriate levels (quick/easy fix). Tried the 3 trip reset afterwards, no change.Trouble Diagnosing Cause of P0128 Code. -I'm on my 3rd Thermostat in the last month (Original Thermostat I thought went bad and was stuck open, replaced it with one that didn't solve the Jeep from throwing the code, then put another one in and it hasn't solved the problem). -I replaced the Coolant Temperature Sensor to see if that was the …Feb 17, 2020 · 548 posts · Joined 2014. #1 · Feb 17, 2020. Hi all. I got DTC code P0128 this morning - probably stuck thermostat. 2015 JKU with almost 80K... so probably it's time. Jeep is covered with lifetime powertrain warranty. Jun 17, 2023 · The most common cause for the P0128 code on a Jeep Wrangler is a faulty thermostat. A faulty thermostat can be what is described as a "stuck open thermostat." Other issues can be low coolant, a bad radiator fan or water pump, an inaccurate engine coolant temperature sensor (ECT sensor), or a bad engine control module. Check Out The Latest Price! In this video, I'll explain what the P0128 Coolant Thermostat Error Code means when your check engine like goes on and you get this code. Another name is P01...What the P0128 code means. The P0128 code means that the engine coolant is not getting warm enough, fast enough. In other words, there is a problem with the engine operating temperature not being reached within a certain amount of time. The Engine Control Module (ECM) determines this length of time based on ambient …548 posts · Joined 2014. #1 · Feb 17, 2020. Hi all. I got DTC code P0128 this morning - probably stuck thermostat. 2015 JKU with almost 80K... so probably it's time. Jeep is covered with lifetime powertrain warranty.Doctor and hospital bills are riddled with errors. Learning to spot and fix them could save you thousands on your care. By clicking "TRY IT", I agree to receive newsletters and pro...The P0128 code and what it means for your car. The P0128 code is a diagnostic trouble code (DTC) for "Engine Coolant Temperature Below Thermostat Regulating Temperature." This code indicates that the engine coolant temperature is not getting hot enough, fast enough. The thermostat is designed to open at a specific …With the engine running, ambient temperature between -8° C (17.6° F) and 50° C (122° F), start up coolant temperature less than 50° C (122° F) and average vehicle speed greater than 16 kph (10 mph) until coolant temperature reaches 85° …OBD II codes or Diagnostic Trouble Codes (DTCs) are one of the most common ways for mechanics to identify and diagnose car issues quickly. One such code is P0128, which has been reported to be a common issue in Jeep Grand Cherokees. In this post, we will look at what P0128 is, its causes, and how to troubleshoot and fix the issue.7 posts · Joined 2010. #1 · Jan 26, 2011. I just received diagnostic code P0128 while driving home. From my search I understand it is an issue with the thermostat or coolant. Which makes sense as the following has played out in the last few days: 4 days ago I noticed my coolant level was about a half inch below the minimum line on the ….

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