Jeep jk code p0128 - Before you can reset the P0128 code in your Jeep Wrangler, it is essential to locate the OBD-II port. The OBD-II port is a standardized diagnostic interface that allows you to connect an OBD-II scanner to your vehicle. In most Jeep Wrangler models, the OBD-II port is conveniently located under the dashboard on the driver’s side. ...

 
P0135 is a very common OBDII code that occurs in the Jeep Wrangler. It is caused by a failure in one of the oxygen sensors heated elements, specifically bank 1 sensor 1. It technically stands for: P0135: Heated Oxygen Sensor → Sensor Heater Circuit Malfunction → Bank 1, Sensor 1. The purpose of the heated element in the oxygen …. Byrnside hardware danville

Nov 5, 2018 · Fixing P0128 in the Jeep Compass 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 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...Apr 18, 2018 · 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). 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 ...Jan 27, 2023 · #1 · Jan 27, 2023. Got a check engine light a couple months ago. P0128. Since then, the CEL went away on its own. My Jeeps temp has been right in the center. No overheating. The air blows very hot from the vents. I have not had any heat issues before or after. What are your opnion's on this? Should I still replace the thermostat and coolant? Feb 8, 2022 · P0128 Jeep Wrangler coolant sensor replace diy. Code P0128 could be either the thermostat or the coolant sensor .Today I replaced the coolant sensor on our 2... Solving the issue we have that is causing the check engine light to illuminate. P0128 error code can be one of several problems... this video shows how I was...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.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.Learn the difference between source code and object code within computer programming. Each term has its own use; deciphering them can be difficult at first, but with this easy-to-f...P0218 ‐ High Temperature Operation Activated. It has been anything but hot here, high in the upper 50s last two weeks. All fluids are at correct levels, fluids look clean and good. We did go wheeling last Saturday in the mountains but the highs were only around 45 and most of the wheeling was in the snow. I have 17,000 miles on it so it is ...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.Learn how to create a QR code, and you can use it to accept payments, marketing, and more to engage with your customers on smartphones. Quick Response codes or QR codes are a great...Apr 12, 2021 · 21. Location. Louisiana. Jan 6, 2023. #1. I need a reliable and quick response to my concern. My check engine light is on and I checked for the code. It shows me the P0128 code related to the coolant system running low temperature. I read somewhere that the risk is low, but should get it checked out within a month. Overview on how to replace the thermostat on 2012 - 2017 Jeep Wranglers with 3.6L engine. This had the P0128 code. Hardest part of the job is bleeding the ...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 …However, before you replace your entire thermostat, inspect these other areas as well. Low engine coolant can alter the engine running temperature enough to signal trouble code P0128. 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 ...Aug 22, 2018 · I just recently re-entered the Jeep world with a 2012 JKU sport auto. About two weeks ago while driving my jeep threw three codes. P0128 (coolant temp low), P0306 (misfire on cylinder 6) and random misfire. No real drivability problems other than a slight bog when the jeep shifted into third gear. 12 days and 10 stages spanning 400km on jeep track, goat track...sometimes no track. IT SAYS SOMETHING about this race that none of the international riders who previously complete...Nov 5, 2018 · 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 ... If the coolant in the radiator is properly topped off and there's no issue with the radiator cap and the coolant (HOAT for a 2008) is still within 5 yrs./100K miles, this could be the issue: Update - Dealer called - TSB for P2181 code. NUMBER: 18-015-10 REV. GROUP: Vehicle Performance. DATE: August 12, 2010.Fixing P0128 in the Jeep Compass 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 ...7 posts · Joined 2021. #1 · Mar 1, 2021. When driving on the road, my CEL came on, managed to scan it and my scanner came up with the P1239 code. Haven't heard that one before I so I looked it up and apparently it calls for my engine oil temp being too low. Has anyone else had this code in the past, if so, what did you do to correct it?Walk through the steps for replacing a thermostat and housing. Once that is done follow up with bleeding the air out of the system. These steps will clear ...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 ...What is P0128 Jeep JK Diagnostic Code? This is a DIY video for Jeep JK Thermostat Replacement...Parts:1) Mopar Thermostat w/housing - …Code breakers are people who use logic and intuition in order to uncover secret information. Learn more about code breakers and how code breakers work. Advertisement Information is...4’th Cylinder. P0304 is a cylinder-specific misfire code, meaning only your Wrangler’s fourth cylinder has a misfire. Before you can even diagnose P0304 in your vehicle, you need to find the fourth cylinder’s location. On “V” configuration engines, it’ll usually be the second cylinder on the head further away from the front of the ...Jeep Wrangler: P2181 Symptoms. Engine overheating. Engine too cold. No/low heat. Stalling, rough idle. If the engine is stalling and running rough after getting this code, it is likely that the head gasket could be blown if it got hot. If the engine is running cold it could run rough because it’s too rich.Oct 25, 2023 · The P0128 code is a diagnostic trouble code (DTC) that indicates a possible issue with the thermostat in your Jeep Wrangler’s engine. It is related to the engine coolant temperature being below the expected operating range. 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 ... Frequently Asked Questions about the Jeep P0128 Code What is the normal engine operating temperature range? The normal operating temperature for the 3.6L Jeep JK Wrangler engine is around 195-220°F when warmed up and varying slightly based on operating conditions. If the PCM sees temperatures staying below 190°F, it will trigger the P0128 code.CEL p0128 code 'coolant temp below thermostat regulating temp' ... 2016 JK Rubicon Hard Rock Auto Trans 2008 Jeep Liberty Auto Trans 1988 E-150 4.9L 5 Speed StickOct 27, 2021 · P0128 Code and Coolant - JK 2012 Rubicon. Okay, so my engine light came on today. Stopped by the auto parts store to have the code checked. Came back P0128 stating coolant temp below regular temp. So the guy suggested a thermostat said it is quite common. Stopped by the auto parts store to have the code checked. Came back P0128 stating coolant temp below regular temp. So the guy suggested a thermostat said …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...Mar 25, 2022 · 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 What Does Code P0128 Mean? Code P0128 stands for Engine Coolant Temperature Below Thermostat Regulating Temperature. It means that the ECM/PCM has “noticed” that the engine coolant temperature is consistently running below thermostat regulating temperature. In other words, the engine is running cooler than it should.Do-It-Yourself instructions for replacing a thermostat housing in a 2012 Jeep Wrangler JK with a 3.6L V6 Pentastar engine. Fix the P0128 trouble code.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 ...P0128 code: replacing your 2012-2017 jeep jk thermostat Misfire jeep fix. Jeep wrangler tj p0456 p0455 trouble evac repair codes2012 jeep grand cherokee/wrangler 3.6 thermostat p0128 code .. 2012 Jeep Grand Cherokee/Wrangler 3.6 Thermostat P0128 code - YouTube. Check Details. P0128 Jeep JK Diagnostic Code, Thermostat …Code Number Code Description Related Codes; P0128: Coolant Thermostat (Below Regulating Temperature) P0125 - Insufficient Coolant Temperature P0127 - Intake Air Temperature (IAT) Too HighIf you’re planning a trip to explore the breathtaking beauty of the great outdoors, there’s no better way to do it than with Pink Jeep Tours. One of the easiest and most effective ...Photomikes Garage. 15.7K subscribers. Subscribed. 566. 75K views 2 years ago MAPLE RIDGE. P0128 Jeep Wrangler coolant sensor replace diy. Code P0128 …DATE: August 12, 2010. SUBJECT: Flash: MIL Illumination For P2181 - Cooling System Performance. OVERVIEW: This bulletin involves flash reprogramming the Powertrain Control Module (PCM) with new software. MODELS: 2008 (JK) Wrangler. NOTE: This bulletin applies to JK vehicles equipped with a 3.8L engine (Sales code EGT).Do-It-Yourself instructions for replacing a thermostat housing in a 2012 Jeep Wrangler JK with a 3.6L V6 Pentastar engine. Fix the P0128 trouble code.Dec 14, 2019 · 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... Double failure monitoring to determine unique failure situations that could require unique limp-in functionality. The Diagnostic Trouble Code (DTC) sets when the failure is detected if the output speed gradient is less than a threshold for a calibrated amount of time. U1412 Jeep Code - Implausible Vehicle Speed Signal Received.Oct 5, 2022 ... P0128 CHECK ENGINE Jeep Grand Cherokee WK2 Dodge Durango 3.6 pentastar Thermostat replacement! · Comments32.Code c1252/traction control light intermittently on. I’ve got a 2016 rubicon hard rock and my traction control light is randomly coming on. Usually once every other week, comes on upon startup. Won’t go off on it’s own, but if I turn off vehicle and turn it back on it will be gone. Got a code reader, was surprised to find it wasn’t a ...Turn on the motor and top off fluid as it fills in, once it doesn’t take no more close the radiator cap. Now let the motor run for a few minutes while it gets hotter and once 5-10 minutes have gone by turn it off and open the bleeder valve. This is how I’ve done it previously. Repeat the bleeder procedure twice or 3 times and you should be ...CMSRock. 747 posts · Joined 2020. #13 · Jan 4, 2024. The p0128 shows up when the coolant temp doesn't come up fast enough or not at all, eventually depending on outdoor temp and travel speed it will get warm enough to bring up gage and give you heat but the code was set because it didn't warm up in the expected time.Nov 5, 2018 · 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 ... P0128 Code: Replacing your 2012-2017 Jeep JK Thermostat - YouTube. BullGear Off-Road. 2.26K subscribers. Subscribed. 118. 18K views 3 years ago. Watch …Feb 23, 2019 · ** Click "Show More" to Learn more about this video **=====Check out our NEW Website for 2023!!https://www.milehighcampers... The two-letter codes such as YJ, TJ, JK, and JL on different Jeep Wrangler models are nothing but the body styles of individuals. For example, the YJ means that the Jeep Wrangler has square headlights, while the TJ model has round headlights. Similarly, the code JK refers to the two-door and four-door models and the production years of …Overview on how to replace the thermostat on 2012 - 2017 Jeep Wranglers with 3.6L engine. This had the P0128 code. Hardest part of the job is bleeding the ...Messages: 7. Gender: Male. 2010 JKU. 3.5" lift, 35s. My 2010 3.8 keeps throwing the cam sensor code P0340 with the traction control light with limp mode. I've cleaned connections on the harness for the cam, air, and coolant sensor. Wiring looks OK to me other than the tightness of it and exposure where the brittle plastic loom disintegrated.Apr 18, 2018 · 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). What Does Code P0128 Mean? P0128 definition: Coolant Thermostat Temperature Below Regulating Temperature. Issue Severity: LOW– Continued driving …Nov 21, 2023 · Code P0128 2013 JK. Checked my coolant level in the radiator and had to add a little. Overflow bottle was normal level. After a drive I discovered a very small leak coming from under the radiator cap. I replaced the cap with the latest upgrade, 17 PSI cap which is down from the original 18 psi cap. After a couple of short trips of 12 miles CEL ... 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. The Check Engine Light is on, and the temperature gauge is showing very low temp and the fan is constantly running. Sometimes the engine doesn't start right …Oct 28, 2023 · Frequently Asked Questions about the Jeep P0128 Code What is the normal engine operating temperature range? The normal operating temperature for the 3.6L Jeep JK Wrangler engine is around 195-220°F when warmed up and varying slightly based on operating conditions. If the PCM sees temperatures staying below 190°F, it will trigger the P0128 code. Somewhere in between getting started with programming and being job-ready competent, you might experience the "desert of despair." Viking Code School explains why this struggle hap...I just recently re-entered the Jeep world with a 2012 JKU sport auto. About two weeks ago while driving my jeep threw three codes. P0128 (coolant temp low), P0306 (misfire on cylinder 6) and random misfire. No real drivability problems other than a slight bog when the jeep shifted into third gear.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.Apr 12, 2021 · 21. Location. Louisiana. Jan 6, 2023. #1. I need a reliable and quick response to my concern. My check engine light is on and I checked for the code. It shows me the P0128 code related to the coolant system running low temperature. I read somewhere that the risk is low, but should get it checked out within a month. 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. Symptoms: With the code …Aluminum flywheel Aluminum drive shaft ECU flash tuner Cold air intake Large bore throttle body The 5.7 HEMI engine is available in the Dodge, Chrysler and Jeep vehicles, making it...What Does Code P0128 Mean? Code P0128 stands for Engine Coolant Temperature Below Thermostat Regulating Temperature. It means that the ECM/PCM has “noticed” that the engine coolant temperature is consistently running below thermostat regulating temperature. In other words, the engine is running cooler than it should.2016 JK Rubicon Hard Rock Auto Trans 2008 Jeep Liberty Auto Trans 1988 E-150 4.9L 5 Speed Stick God Bless Our Troops. Reactions: jadehaley17601. ... After about 60 miles and 3 or 4 trips the permanent P0128 code cleared. However, when I run a live trace on the coolant temperature it comes up to about 203 - 204 deg F, which I am happy …Jan 7, 2023 · Code Definition. P0128 – Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) What Does the P0128 Code Mean? 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 required timeframe set by the manufacturer. Make: Jeep. Code: P258B. Definition: Electric Vacuum Pump Performance. Description: The Electric Vacuum Pump (EVP) system is installed to provide supplemental vacuum to the brake booster, when the engine vacuum supply is low. The pump is connected to the engine and the brake booster through a series of hoses and one-way flow check valves.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.My engine light came on with a P0128 (temp not reaching running temp within 15 mins). The temp gauge started climbing and bouncing between 3/4 and half. The temp on the dash was reaching 235 and 240 which is very hot for this car. Question: The code usually means a bad coolant sensor or a bad thermostat. But these usually fail OPEN …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...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...Learn the building code for sistering joists and why it's important for your construction project. Follow best practices and ensure safe and reliable results. Expert Advice On Impr...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.7 posts · Joined 2021. #1 · Mar 1, 2021. When driving on the road, my CEL came on, managed to scan it and my scanner came up with the P1239 code. Haven't heard that one before I so I looked it up and apparently it calls for my engine oil temp being too low. Has anyone else had this code in the past, if so, what did you do to correct it?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 ...P0113 is an OBDII trouble code that occurs when the Jeep Wrangler’s engine management computer detects that there is an issue with the Intake Air Temperature (IAT) Sensor, specifically that there is a High Input Problem with it.. P0113: IAT Sensor – High Input Problem. The IAT sensor is responsible for measuring the air temperature and …Code Number Code Description Related Codes; P0128: Coolant Thermostat (Below Regulating Temperature) P0125 - Insufficient Coolant Temperature P0127 - Intake Air Temperature (IAT) Too High107 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.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...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.Jan 24, 2020 · 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 ... Of course, they can't get it looked at in a timely fashion, so I'll do it myself. On the 2013 Wrangler JK, I have had the P0128 light on since having the water pump squeal replacement. Last week I replaced the thermostat (and housing-one piece) to the tune of ~$75, including a gallon of the $26 dollar OAT antifreeze. Light decided to come back on.

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 .... How to use numeric solver on ti 84

jeep jk code p0128

Dec 20, 2014 · This code sets when the ECM sees that the engine takes to long to warm up. This usually happens because the thermostat is either stuck open or opening sooner than it should. It is a pretty global cause and correction for P0128 across many makes and models of vehicles. Replacing the T-stat should take care of this and you should not have any ... 2016, 3.6 Check Engine light P0128 coolant temp code. ... I don’t know if anyone has the FSM for JKs. The values would be in there I’m almost sure. ... A forum community dedicated to Jeep Wrangler owners and enthusiasts. Come join the discussion about reviews, performance, trail riding, gear, suspension, tires, classifieds, …Jul 29, 2016 · 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 is a trouble code often associated with a malfunctioning thermostat. Find out what P0128 code means, its symptoms, and how to fix it. Get 10% OFF EVERYTHING . ... a Ford, or a Jeep, the P0128 code is likely to appear once your coolant thermostat or temperature sensor fails. ...Best Solutions for the P0128 Code. You can try several solutions to fix the P0128 code in your Jeep. Replace the Thermostat. It must be replaced if a faulty thermostat is causing the P0128 code. A new thermostat will regulate the flow of coolant and help maintain the proper engine temperature. Check and Refill Engine CoolantP0128 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 ...Low-code is a way to design and develop applications with little or no coding. It empowers users with little to no technical background. * Required Field Your Name: * Your E-Mail: ...P0128-THERMOSTAT RATIONALITY. For a complete wiring diagram,refer to the Wiring Information . When Monitored and Set Conditions. When Monitored: This diagnostic runs when the following conditions are met: - With the engine running. - Start up coolant temperature less than 65°C (149°F).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.JK Diagnostic Codes 2007 – 2018. Below are the Diagnostic Trouble Codes ... P0128: Thermostat Rationality: P0129: Barometric Pressure Out-of-range Low: P0131: O2 Sensor 1/1 Circuit Low: ... Jeep Model Codes; Jeep VIN Decodes by Vehicle; Off Road & Automotive Terms; Quick Primer on Shock Absorbers; Tech – Oil: Additives (Detergents) ...2016 JK Rubicon Hard Rock Auto Trans 2008 Jeep Liberty Auto Trans 1988 E-150 4.9L 5 Speed Stick God Bless Our Troops. Save Share. Like. M. msetter Discussion starter ... I've got the P0128 Code. I ordered a digital laser infrared thermometer and will check the temp at the thermostat housing. I need the thermometer for other things, so …Model Specific Jeep Discussions. Wrangler JK (Model years 2007–2018) JK Technical Discussion. JK code and replacing thermostat. Tags jku 2012 p0128 thermostat. Jump to Latest Follow 5K ... After jumping to a new tab I ….

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