2024 Jeep code po128

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Nov 5, 2018 · Fixing P0128 in the Jeep Patriot 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 ... A software program is typically written in a high-level programming language such as C or Visual Basic. This native code is then compiled into machine code that can be run on a com...Diagnosing and troubleshooting the PO128 code in a Jeep Wrangler typically involves the following steps: Scan for codes: Use an OBD-II scanner to retrieve the fault codes stored in the vehicle’s ECM, including the PO128 code. Inspect the ECT sensor: Check the ECT sensor for any physical damage or signs of corrosion.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...The most common symptom of a P0128 trouble code in a Jeep Liberty 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 Liberty is the lack of heat. When the thermostat doesn’t bring ...Save up to 80% today with the top Western Digital coupon codes from PCWorld. 15% off SSDs, hard drives & My Passport. 15% off Western Digital Student Discount. PCWorld’s coupon sec...Service Engine Soon. – Other than the heater not working, the only other symptom of P0128 is typically the service engine soon light itself. Slight Decrease in fuel economy – The P0128 code may also lead to a slight decrease in fuel economy. This is because your Silverado’s engine is running at a cooler temperature than it should be.@HowIFixedIt Replacing thermostat and housing on a Jeep. 2014 Jeep Grand Cherokee thermostat location replacement. Check engine light code P0128 on a Jeep. J...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 …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.34 posts · Joined 2012. #23 · Jan 13, 2017. Heads up that my 2012 JKU threw a P0128 and it was just because my coolant level had dropped below the min line. The colder weather was enough to trigger it. Once I added some coolant the code cleared and the CEL went away after about 3 drive cycles (about 3 days later).A PO128 code in a Jeep can be caused by a faulty coolant temperature sensor, a malfunctioning thermostat, or other related issues. Diagnostic and Repair Procedures for a PO128 Code. To diagnose and repair a PO128 code in a Jeep, it is recommended to start by checking the coolant level and inspecting for any leaks. Next, …34 posts · Joined 2012. #23 · Jan 13, 2017. Heads up that my 2012 JKU threw a P0128 and it was just because my coolant level had dropped below the min line. The colder weather was enough to trigger it. Once I added some coolant the code cleared and the CEL went away after about 3 drive cycles (about 3 days later).P0128 Jeep Diagnostic Trouble Code (DTC) Definition, Causes and DiagnosisIt 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 ...447 posts · Joined 2016. #2 · Jan 23, 2017. That code is usually displayed when the engine takes too long to reach operating temperature (thermostat stuck open). So, under certain conditions after you clear the code, depending on outside air temp, driving conditions, it may warm up within the parameters the computer is looking for, despite ...Dec 16, 2022 · 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 ... 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.Jeep code P0128 refers to a diagnostic trouble code related to the cooling system of a Jeep vehicle. It indicates that the engine coolant temperature has not reached the expected operating temperature within a specified time after starting the engine. The Jeep code P0128 is a generic code, meaning it is applicable to various Jeep models …We found a couple of Chrysler technical service bulletins for several Jeep and Dodge models that recommend reprogramming the PCM (engine computer) if the code P0128 is diagnosed. Another Chrysler TSB for 2009-2010 Dodge Challenger and 2008-2010 Dodge Magnum/Charger and Chrysler 300 describes a problem where the thermostat may move out of place ...This code indicates that the ECT sensor is not functioning properly or is sending incorrect signals to the engine control module (ECM). How does the PO128 …The Jeep is a daily driver, mostly short trips. This was a P0128 code. I had replaced the coolant temp sensor twice, and the thermostat 3 times. I also took it to the dealer who charged $95 to tell me he thought the fix was changing the thermostat housing for $400, which I declined to do. LOL.Jeep code P0128 indicates that the engine coolant temperature is lower than the thermostat regulating temperature. It indicates that the engine is running colder than it should. Use the Way App to find the best gas discounts , EV charging near you , auto insurance , auto refinance , and more!Mar 7, 2023 · 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. P0128 Thermostat gasket/Housing replacement tutorial on a 2013 Jeep Wrangler 3.6 Don't forget to like and sub! ... P0128 Thermostat gasket/Housing replacement tutorial on a 2013 Jeep Wrangler 3.6 ...If you own a Jeep or are planning to buy one, it’s important to be aware of any potential recalls that may affect your vehicle. Recalls are issued by manufacturers when they discov...Jeep code P0128 refers to a diagnostic trouble code related to the cooling system of a Jeep vehicle. It indicates that the engine coolant temperature has not reached the expected operating temperature within a specified time after starting the engine. The Jeep code P0128 is a generic code, meaning it is applicable to various Jeep models and ...What is Engine Code P0128 in a Jeep Wrangler? 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 ...How to change thermostat on a 2006-2017 Dodge Jeep Chrysler Ram vehicles. P0128 code fixed.Coolant temperature over heating or temperature below operational,...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 ...Yep, I will be doing my thermostat and housing soon. I suggest you join a local Jeep club or find a boyfriend that can help. Perhaps a local 4x4 store can help. Powertank is up there. ,2022 JTR Loaded. Rock Hard alu bumper, Warn 12K winch. KC lights, Mopar 2 inch lift, Synergy track bars F&R & CAs rear. Method Machine finish …Aug 8, 2023 · 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. The Jeep power train control module (PCM)--or computer, as it is known in layman’s terms--controls the vehicle’s ignition, emission and fuel systems, along with other auxiliary sys...In this video we diagnose code P0128 on my 2015 DODGE DURANGO and repair it. for cool tee shirts and merch check out the storehttps://teespring.com/stores/fr...Diagnosing and troubleshooting the PO128 code in a Jeep Wrangler typically involves the following steps: Scan for codes: Use an OBD-II scanner to retrieve the fault codes stored in the vehicle’s ECM, including the PO128 code. Inspect the ECT sensor: Check the ECT sensor for any physical damage or signs of corrosion.Save up to 80% today with the top Western Digital coupon codes from PCWorld. 15% off SSDs, hard drives & My Passport. 15% off Western Digital Student Discount. PCWorld’s coupon sec...What Is Trouble Code P0128? This generic trouble code can affect most makes and models of vehicles. The code is signaled when your powertrain control module detects an …Feb 26, 2019 · 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. ... The Jeep Wrangler is a car that bills itself on its fearless character. Jeep has sought to portray the car as the ultimate vehicle for adventure seekers who love exploring the unch...Nov 6, 2018 · 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 ... 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 …25 Jan 2023 ... How to replace your thermostat on a 2004 TJ wrangler if you have a code P0128 engine coolant temperature is below the thermostat regulating ...P0128-THERMOSTAT RATIONALITY. For a complete wiring diagram, refer to the Wiring Information. When Monitored and Set Conditions. This diagnostic runs when the following conditions are met: With the engine running. Start up coolant temperature less than 65°C (149°F).The P0128 code in Jeep Wrangler indicates that the engine coolant temperature is below the thermostat regulating temperature. This subheading will explain what the code means and why it occurs. The P0128 code typically triggers when the coolant temperature doesn’t reach the expected operating temperature within a certain time frame.The Code of Hammurabi is an important artifact because it sheds light on laws in Babylonia. Learn why the Code of Hammurabi explains "an eye for an eye." Advertisement When we thin...OBD2 Code P0128 Jeep definition: This means that the engine’s PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 Jeep code is to indicate a faulty thermostat. Similar codes: P0125 Jeep In determining the engine did not reach a ...The Jeep is a daily driver, mostly short trips. This was a P0128 code. I had replaced the coolant temp sensor twice, and the thermostat 3 times. I also took it to the dealer who charged $95 to tell me he thought the fix was changing the thermostat housing for $400, which I declined to do. LOL.Diagnosing and troubleshooting the PO128 code in a Jeep Wrangler typically involves the following steps: Scan for codes: Use an OBD-II scanner to retrieve the fault codes stored in the vehicle’s ECM, including the PO128 code. Inspect the ECT sensor: Check the ECT sensor for any physical damage or signs of corrosion.The P0128 fault code is the diagnostic trouble code (DTC) used by Dodge, Jeep, Ram, and numerous other manufacturers to signify that the coolant temperature in the engine is too cold for the thermostat to regulate.The P0128 engine code can result from numerous issues including a malfunctioning thermostat, a faulty coolant 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.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 …Mar 7, 2023 · 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. 34 posts · Joined 2012. #23 · Jan 13, 2017. Heads up that my 2012 JKU threw a P0128 and it was just because my coolant level had dropped below the min line. The colder weather was enough to trigger it. Once I added some coolant the code cleared and the CEL went away after about 3 drive cycles (about 3 days later).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! Nov 5, 2018 · Fixing P0128 in the Jeep Patriot 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 ... 21 Nov 2021 ... Comments46 ; Please DO NOT Buy a Dodge (Unless It Has This Engine). Scotty Kilmer · 671K views ; DIY Fix – Fault Code P0128 (Coolant Temperature ...Save up to 80% today with the top Western Digital coupon codes from PCWorld. 15% off SSDs, hard drives & My Passport. 15% off Western Digital Student Discount. PCWorld’s coupon sec...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.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.OBD2 Code P0128 Jeep definition: This means that the engine’s PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 Jeep code is to indicate a faulty thermostat. Similar codes: P0125 Jeep In determining the engine did not reach a ...Aug 22, 2022 · P0128 Code - How To Replace Jeep Wrangler Coolant Sensor, Thermostat & Bleeding Coolant System - YouTube. Just Empty Every Pocket. 2.52K subscribers. Subscribed. 448. 33K views 1 year ago... 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...Don't procrastinate on fixing misfires as they can quickly damage catalytics. as for your p0128, it was likely a history code (unless your check engine was on solid. p0128 will only reset after quite a few cycles (believe 40 from history). No worries as if it did set once, your thermostat was likely losing some performance.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...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...21 Nov 2021 ... Comments46 ; Please DO NOT Buy a Dodge (Unless It Has This Engine). Scotty Kilmer · 671K views ; DIY Fix – Fault Code P0128 (Coolant Temperature ...Contact details, email and telephone number of authorised Jeep Kolkata workshop and service centers. You may also contact Kolkata Jeep dealer for more information. Jeep …237 posts · Joined 2015. #1 · Mar 7, 2017. Check engine light came on last Wednesday. Code was P0128. Checked YouTube and the internet and everything said replace the thermostat as it probable stuck open. Cleared the code. Ordered the part and Mopar replacement coolant. Engine light has not come back on and I've driven it a lot, …Feb 22, 2024 · Code Number Code Description Related Codes; P0128: Coolant Thermostat (Below Regulating Temperature) P0125 - Insufficient Coolant Temperature P0127 - Intake Air Temperature (IAT) Too High 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.Fixing P0128 in the Jeep Wrangler 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: 1. Thermostat Stuck Open– Far and away, the most typical cause for the P0128 code is a thermostat that is stuck open. When a … See moreThe FIXD wireless OBD2 scanner and free app for iPhone and Android translates your check engine light into plain English so you can rest easy. In this video,...jeep, grand cherokee, thermostat, P0128, radiator, diy, replace, coolant, cooling, engine problemLooking for what “business casual” actually means? Find out more in our quick guide to the business casual dress code. Human Resources | What is WRITTEN BY: Charlette Beasley Publi...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 …Fixing P0128 in the Jeep Cherokee 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 ...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...What You Need to Know About Replacing Parts Related to Code PO128 Problems. 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.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...T. tonydee Discussion starter. 37 posts · Joined 2017. #1 · Jan 24, 2020. Hi, In my 2013 JKU (40,000 mi) I'm getting a P0128 code. This is happening frequently here in south east Pennsylvania in the winter. It did happen once in the summer. I keep clearing the code with my ODB II scanner. The temp is running 169-174 deg F according to the OBD ...Mar 4, 2022 · 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? What is P0128 Jeep JK Diagnostic Code? This is a DIY video for Jeep JK Thermostat Replacement...Parts:1) Mopar Thermostat w/housing - https://www.amazon.com...How to Fix a Dodge, Chrysler & Jeep P0128 engine code: Thermostat Rationality or Coolant thermostat – coolant temperature below the thermostat regulating tem...Jan 24, 2024 · The P0128 code in Jeep Wrangler indicates that the engine coolant temperature is below the thermostat regulating temperature. This subheading will explain what the code means and why it occurs. The P0128 code typically triggers when the coolant temperature doesn’t reach the expected operating temperature within a certain time frame. 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 ... When you need to locate a dealer that sells or services Jeep vehicles, there are a few ways to find one. You can search through the Jeep website, a partner website, online sources ...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).Music has long been shown to boost both cognitive performance and productivity. These are the most popular songs to code to. Music has long been shown to boost both cognitive perfo...

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 …. Santa fe springs swapmeet hours

The P0455 Jeep code occurs when the PCM detects a large EVAP leak. Symptoms include an illuminated CEL, subpar engine performance, stalling, and excessive exhaust smoke (among others). A malfunctioning gas cap or a defective emissions control system component can cause the fault code. However, the list does not end there.Sirius satellite radio is available in many new cars, including Jaguar, Mazda, Ford, Jeep, Chrysler, Dodge, Mercedes-Benz, BMW, Volvo, Volkswagen and Audi vehicles. If your new car...PO128 code? Jump to Latest Follow ... Previous Jeeps: 84 CJ7 (A True Jeep), 2000 XJ (163,000 Miles/Totaled (Pictures of wrecked Jeep in gallery)), 2004 WJ (parting out die to major electrical issues) If you don't have time to do it right the first time, how do you have time to do it over. Lifetime member #13 www.militaryjeepers.com …The code means it is not reaching proper temp or not fast enough. The IAT sensor could be bad especially if you are in a cold climate. Read this link, it may help. OBD-II Trouble Code: P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) '05 Rubi TJ Unlimited. '93 Toyota 4Runner. Like.OK, I just installed new "MoPar" thermostat after getting the PO128 code. Also decided to drain what I could of the 14 quarts listed in manual from lower hose. Was not able to flush completely but the 2 gallons of fluid removed looked new and 2014 WK only has about 70K so thought that should be fine.The P0128 code can also be triggered by malfunctions in the engine coolant temperature sensor or its circuit. If the sensor is sending incorrect readings to your engine control module, it may think that the engine is running at a lower temperature than it actually is. This can cause the P0128 code to be triggered. Overall, there are several potential …AUBURN HILLS, Mich., Jan. 18, 2022 /PRNewswire/ --New factory-backed, Wi-Fi-capable, Level 2 (240-volt), at-home, hybrid-electric-vehicle, wall ch... AUBURN HILLS, Mich., Jan. 18, ...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 …The most common symptom of a P0128 trouble code in a Jeep Renegade 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 Renegade is the lack of heat. When the …A PO128 code in a Jeep can be caused by a faulty coolant temperature sensor, a malfunctioning thermostat, or other related issues. Diagnostic and Repair Procedures for a PO128 Code. To diagnose and repair a PO128 code in a Jeep, it is recommended to start by checking the coolant level and inspecting for any leaks.34 posts · Joined 2012. #23 · Jan 13, 2017. Heads up that my 2012 JKU threw a P0128 and it was just because my coolant level had dropped below the min line. The colder weather was enough to trigger it. Once I added some coolant the code cleared and the CEL went away after about 3 drive cycles (about 3 days later).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) Faulty coolant temperature (ECT) sensor; Faulty intake air temperature (IAT) sensor; ... codes P013A and P0128 2007 Jeep Commander 5.7 Hemi My Jeep is throwing those …Jan 25, 2024 · Diagnosing and troubleshooting the PO128 code in a Jeep Wrangler typically involves the following steps: Scan for codes: Use an OBD-II scanner to retrieve the fault codes stored in the vehicle’s ECM, including the PO128 code. Inspect the ECT sensor: Check the ECT sensor for any physical damage or signs of corrosion. Discover everything you need to know about Urchin Tracking Module (UTM) codes and how to create UTM tracking URLs on Google Analytics. Trusted by business builders worldwide, the H...Don't procrastinate on fixing misfires as they can quickly damage catalytics. as for your p0128, it was likely a history code (unless your check engine was on solid. p0128 will only reset after quite a few cycles (believe 40 from history). No worries as if it did set once, your thermostat was likely losing some performance.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.Marissawalkerjones94 Discussion starter. 1 post · Joined 2020. #1 · Feb 3, 2021. I have a 2015 Jeep Wrangler with thermostat rationality throwing a code on my jeep. The tech said it could just be a sticking thermostat but upon reading it could be an engine coolant temp sensor. My temp runs normal on my jeep, & everything runs normal.The P0128 code can also be triggered by malfunctions in the engine coolant temperature sensor or its circuit. If the sensor is sending incorrect readings to your engine control module, it may think that the engine is running at a lower temperature than it actually is. This can cause the P0128 code to be triggered. Overall, there are several potential …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..

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