Jeep error code p0128 - The Jeep JK code P0128 is a Diagnostic Trouble Code (DTC) that indicates a problem with the Engine Coolant Temperature (ECT) sensor or thermostat. This code suggests that the engine is not reaching the proper operating temperature within a specified time frame. 2. Possible causes of the P0128 code in a Jeep JK.

 
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.. Cavuto live

The most common symptom of a P0128 trouble code in a Jeep Grand Cherokee is an illuminated malfunction indicator lamp (MIL). Other symptoms may …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...Ratchet said: P0128 sets when it takes longer than normal for the engine to reach operating temperature. Generally caused by a thermostat that is partially stuck open and/or low engine coolant. If there is a problem with the coolant temperature sensor, there are several trouble codes that can set for that as well.P0128 2017 jkur. Have a p0128 on 2017 jkur. Temp on dash and jscan showing 185F driving to lunch just now, 12 miles at 55-60 mph in 55F ambient so plenty of time to warm up and get stable. I am thinking thermostat held open. Seems like my 2013 jkur runs around 198F but haven’t double checked yet.Check Engine Light P0128 error code - 2013 Jeep Grand Cherokee (WK2) - thermostat replacementStep by step how to. My Jeep Grand Cherokee's check engine light...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.We bought this Jeep a couple weeks ago and it threw a CEL code P0128 (thermostat rationality). Easy enough fix to change the thermostat but surprisingly there were no videos of this on YouTube so I made one as a contribution to the community. So, two questions: 1. I replaced the thermostat but the CEL is still on.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.Ratchet said: P0128 sets when it takes longer than normal for the engine to reach operating temperature. Generally caused by a thermostat that is partially stuck open and/or low engine coolant. If there is a problem with the coolant temperature sensor, there are several trouble codes that can set for that as well.Complete lists of error codes for Accu-Chek blood glucose meters and the reasons for each code are in the product owner’s booklets and online at Accu-Chek.com, according to Accu-Ch... Check Engine Light P0128 error code - 2013 Jeep Grand Cherokee (WK2) - thermostat replacementStep by step how to. My Jeep Grand Cherokee's check engine light... 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.Error codes that appear on the Maytag Maxima’s digital display include a series of F-codes, C-codes and E-codes, along with various beeps and abbreviations. In some cases two codes...Nov 5, 2018 · 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 ... Low or weaker coolant levels can trigger the P0128 code in your Jeep Grand Cherokee because it can alter the engine running temperature, causing it to deviate from its ideal operating temperature. This can be detected by the engine coolant temperature sensor, which sends signals to the engine computer (PCM) about the engine’s temperature.The Xerox N2125 fuser assembly should be replaced after every 200,000 page impressions. If your printing is high-demand, your fuser assembly may have a shorter lifespan. When your ...P0128 jk replacing thermostat Jeep cherokee p0128 4l Jeep cherokee grand 2008 p0325 code. P0128 Jeep Cherokee 2.4L thermostat. Watch how to replace in Part 2Fixing 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 …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 ...Low or weaker coolant levels can trigger the P0128 code in your Jeep Grand Cherokee because it can alter the engine running temperature, causing it to deviate from its ideal operating temperature. This can be detected by the engine coolant temperature sensor, which sends signals to the engine computer (PCM) about the engine’s temperature.Aug 22, 2022 · For the first time that I can recall Rubi started throwing an error code. After several months I decided to fix it. Originally I was told it was the cooling ... 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.Learn what causes 'The package could not be installed. The theme is missing the style.css stylesheet' error in WordPress and what you can do to fix it. Trusted by business builders...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 ...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 ...Apr 13, 2020 · JEEP CHEROKEE CODE P0128 ENGINE LIGHT ON 2014 2015 2016 2017 2018 2019 2020If you have Jeep Cherokee and you have Code P0128 and your engine light is on we w... When 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,A code P0128 may mean that one or more of the following has happened: Low engine coolant level; Leaking or stuck open thermostat (likely) Faulty cooling fan (running too much) ... codes P013A and P0128 2007 Jeep Commander 5.7 Hemi My Jeep is throwing those codes, but only in cold weather. After the fist time the Check Engine light came on …P0128 2017 jkur. Have a p0128 on 2017 jkur. Temp on dash and jscan showing 185F driving to lunch just now, 12 miles at 55-60 mph in 55F ambient so plenty of time to warm up and get stable. I am thinking thermostat held open. Seems like my 2013 jkur runs around 198F but haven’t double checked yet. It will come up with P0128 thermostat rational... If the check engine light is on in your jeep, dodge, chrysler, ram, I'll bet it's for this super common issue. It will come up with P0128 ... The most common causes include: Thermostat That’s Stuck Open – The most common cause of code P0128 is a leaky or stuck engine coolant thermostat. Faulty Engine Coolant Temperature Sensor – Faulty wiring or a bad sensor can also lead to a P0128 code reading. Radiator Fan Malfunction – Your car’s radiator fan helps cool the …Oct 27, 2020 · =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code P0128 Saving Repair Part... Error codes that appear on the Maytag Maxima’s digital display include a series of F-codes, C-codes and E-codes, along with various beeps and abbreviations. In some cases two codes...Please help support this channel by any means such as word of mouth, sharing the links, or by donations. For donations please click on: https://www.paypal.me...The P0128 Code is not a big problem. One thing to notice is that you should not ignore this occurrence for a long time, which will lead to other trouble in the future. After 500 Miles. You should only travel with the DTC code p0128 for 500 miles. During the distance, the car will not have much damage and risks.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?I will tell you what formats for common handlers exist and why it is better to agree on a single format with the backend than to fence a new solution every time Receive Stories fro...The Jeep JK code P0128 is a Diagnostic Trouble Code (DTC) that indicates a problem with the Engine Coolant Temperature (ECT) sensor or thermostat. This code …Replacing parts related to code PO128 problems can be a daunting task, as was diagnosing the P0128 code in a Jeep. This code indicates that the engine coolant temperature is below normal operating temperature. It is important to understand what needs to be done to properly diagnose and repair this issue.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 ...I need to get my inspection done but my CEL was on with p0128 code. I replaced the thermostat, drove a couple days and the CEL went off. Continued to drive for a few more days. I still cannot get inspected (NY) because the vehicle is showing a P0128 as a "stored" code (using Foxwell NT201 OBD reader), even though the CEL is off.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.The P0128 Jeep code is an engine-related fault code that signifies an inadequate coolant mixture/level or a malfunctioning thermostat. Symptoms include: An activated CEL. Starting and …Nov 5, 2018 · 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 ... 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. 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?Jan 24, 2024 · 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 ... Quick, unedited cell phone video covering P0128 Data Trouble Code (DTC) on 2013 Jeep Wrangler JKUR w/3.6L V6 caused by a faulty thermostat tripping Check Eng...I will tell you what formats for common handlers exist and why it is better to agree on a single format with the backend than to fence a new solution every time Receive Stories fro...P0122 Throttle Position Sensor Circuit Low Voltage. P0123 Throttle Position Sensor Circuit High Voltage. P0124 Throttle Position Sensor 1 Circuit Intermittent. P0125 Engine Coolant Temperature (ECT) Insufficient for Closed Loop Fuel Control. P0126 Insufficient Engine Coolant Temperature for Stable Operation. P0128 Coolant Thermostat.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.04 jeep grand cherokee 4.0 check engine codes Cherokee p0700 Cherokee thermostat p0128 oil hemi srt Jeep cherokee grand 2008 p0325 codeGuide 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 …May 9, 2022 ... P0128 Chrysler 3.2/3.6 Pentastar engine thermostat code, Top 3 causes · Comments192.How to change the thermostat on the 2015-2022 Jeep Grand Cherokee 3.6L v6. Check engine code P0128. IG: Ljs_Garage_Jan 24, 2024 · How to diagnose Jeep engine code P0128 To diagnose engine code P0128, a mechanic may use an OBD-II scanner to retrieve the trouble code and check the engine coolant temperature sensor readings. They may also inspect the thermostat, coolant levels, and overall cooling system for any signs of malfunction. How to Fix. Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for …P0128 jk replacing thermostat Jeep cherokee p0128 4l Jeep cherokee grand 2008 p0325 code. P0128 Jeep Cherokee 2.4L thermostat. Watch how to replace in Part 2 P0128 isn’t the worst code out there, but you should still have a professional mechanic check your car ASAP. Doing so assures you that your vehicle is always operating at its best, while ... 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.Common Reason: Code P0420 is often related to a bad catalytic converter. P0420 means the catalytic converter is not efficiently removing pollutants from the exhaust. Your car won’t pass an emissions test. A bad catalytic converter isn’t a hazard to the driver but it can overheat and destroy engine components.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: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.Jan 23, 2024 · So, buckle up and join us as we delve into the intricacies of Jeep code P0128 and how it affects your vehicle’s performance. Stay tuned for expert insights and practical tips on troubleshooting this common issue. What is Jeep code P0128? Jeep code P0128 refers to a diagnostic trouble code related to the cooling system of a Jeep vehicle. MIAMI, Dec. 22, 2020 /PRNewswire/ -- According to a recent study from the National Institute of Health, adverse drug events (ADEs) may account for... MIAMI, Dec. 22, 2020 /PRNewswi...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 ...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...There’s a diagnostic trouble code for just about every fault that can occur in the modern vehicle. One common DTC is the P0128 code. At first glance, you may think you know exactly what this trouble code means and how to fix it, but you could be surprised. In this guide, we cover the meaning of the P0128 DTC.The most common cause for the P0128 code on a Jeep Gladiator 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!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. 53 posts · Joined 2010. #1 · Feb 15, 2022. Hi All, I have a 2013 Grand Cherokee Trailhawk with the 3.6 and got code p0128 when driving home around 30 miles this weekend. The code came on a few minutes after driving and had my scanner with me. The temp stayed around 195-200 the way home as per the digital guage. Dash guage …P0128 is a trouble code often associated with a malfunctioning thermostat. ... or a Jeep, the P0128 code is likely to appear once your coolant thermostat or ...Labor: 1.0. To diagnose the P0128 Chrysler code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.MIAMI, Dec. 22, 2020 /PRNewswire/ -- According to a recent study from the National Institute of Health, adverse drug events (ADEs) may account for... MIAMI, Dec. 22, 2020 /PRNewswi...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.How to change the thermostat on the 2015-2022 Jeep Grand Cherokee 3.6L v6. Check engine code P0128. IG: Ljs_Garage_Oct 27, 2020 · =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code P0128 Saving Repair Part... Check engine light and P0128 error code, the thermostat is not opening/closing properlyThermostat: https://amzn.to/3HzhuOrMopar 50/50 Fluid: https://amzn.to/...A code P0128 may mean that one or more of the following has happened: Low engine coolant level; Leaking or stuck open thermostat (likely) Faulty cooling fan (running too much) ... codes P013A and P0128 2007 Jeep Commander 5.7 Hemi My Jeep is throwing those codes, but only in cold weather. After the fist time the Check Engine light came on …“People love evidence that confirms they know more than everyone else.” When I think about good manners, I go straight to my favorite scene in the 2001 Anne Hathaway movie The Prin...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 ...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 …Feb 23, 2019 · ** Click "Show More" to Learn more about this video **=====Check out our NEW Website for 2023!!https://www.milehighcampers... 3299 posts · Joined 2015. #4 · Nov 10, 2021. Thermostat stuck open. The first time mine did it, I just erased the DTM. P0128 is a permanent code, and will stay in the system until it completes so many cycles without detecting the low coolant temp. That said, after mine set the code again, I replaced the thermostat. hasn't been back on since.2016, 3.6 Check Engine light P0128 coolant temp code Jump to Latest Follow 7K views 15 replies 7 participants last post by KiwiScott Mar 31, 2022=====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code P0128 Saving Repair Part...Editing is one of the most important parts of writing, but it's hard to know where to start sometimes. Hemingway is a web app that highlights hard to read sentences, adverbs, compl...107 posts · Joined 2013. #1 · Mar 23, 2015. I recently got a code "P0128 thermostat rationality" on my 2015 Jeep SRT. I first had a Jet 180 thermo and recently switched to a Mishimoto 180. Anybody else ever get this code? Is there a way to clear and see if it comes back without going to dealer? Like.MIAMI, Dec. 22, 2020 /PRNewswire/ -- According to a recent study from the National Institute of Health, adverse drug events (ADEs) may account for... MIAMI, Dec. 22, 2020 /PRNewswi...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...

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 fix or .... Harolds chicken nashville tn

jeep error code p0128

We bought this Jeep a couple weeks ago and it threw a CEL code P0128 (thermostat rationality). Easy enough fix to change the thermostat but surprisingly there were no videos of this on YouTube so I made one as a contribution to the community. So, two questions: 1. I replaced the thermostat but the CEL is still on.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.May 9, 2022 ... P0128 Chrysler 3.2/3.6 Pentastar engine thermostat code, Top 3 causes · Comments192.You may find a Jeep P0128 --P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. Home; Make & Model; Repair Topics; More Articles. Alex's Tips for Teens; All about mechanics and shops; ... To determine when to set the Jeep P0128 trouble code, ...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. 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° …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 …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...45 posts · Joined 2014. #1 · Dec 9, 2016. So i did some research and noticed that this code could mean some of the following... - Insufficient warm up time. - Low engine coolant level. - Leaking or stuck open thermostat. - Faulty MAP sensor. - Engine coolant temperature sensor harness is open or shorted. - Engine coolant temperature sensor ...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 P2183 fault code in automobiles can cause the following symptoms: Engine Light ON, Service Engine Soon Warning Light, engine overheating, poor fuel economy, rough idling, stalling, and reduced engine power. It can also cause the engine to run hotter than usual, and the coolant temperature gauge to fluctuate.We got this 2015 jeep wrangler here with check engine light code p0128 Thermostat below temp. I will show you step by step how to change the thermostat and f...Cherokee jeep transmission recalls defect over autoevolutionJeep cherokee engine v6 2l pentastar Fiat chrysler accused of cheating on diesel emissionsJeep thermostat p0128 chrysler replace. 2014 jeep grand cherokee pros and cons at truedelta: 2014 jeep grand2012 jeep grand cherokee/wrangler 3.6 thermostat p0128 code U11e9 … 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. 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 ...P0128 jk replacing thermostat Jeep cherokee p0128 4l Jeep cherokee grand 2008 p0325 code. P0128 Jeep Cherokee 2.4L thermostat. Watch how to replace in Part 2P0128 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.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..

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