Jeep p0128 fix

Fix Engine; 2015 Jeep Grand Cherokee P0128 02 Sep 2023. Sensors backup adds Jeep cherokee grand car limited laredo suv price auto reviews features 4dr 4x2 model chrysler 4x4 cars v6 srt trim Cherokee tpms ateq diagnostic manufactured mandated. 2012-2016 Jeep Wrangler / Cherokee - Thermostat Replace P0128 Code ...

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 ...Common Reason: Code P0172 is often related to a vacuum leak. Combustion engines run most efficiently when they maintain an air-fuel mixture ratio of 14.7 parts air to 1 part fuel. Too much air and/or too little fuel results in the engine running lean setting P0171 or P0174 trouble codes, while too much fuel and/or too little air results in the ...Misfire jeep fix P0128 cherokee 2012 jeep grand cherokee/wrangler 3.6 thermostat p0128 code How to fix engine misfire error code (p0301-p0306) jeep wrangler jkuThe 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.Code P0428. Was the recipient of a hit and run collision in my 2014 Turbodiesel JGC 3 weeks ago. The idiot that hit me was driving a Honda Accord and he made a direct hit on my driver's side wheel. New axle, knuckle, wheel, tire, front grill, side panel, etc. 3 weeks and $11k later I got the car back and all seemed fine.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 ...Changing the thermostat in a 2015 jeep grand cherokee (p0128)Intermittent p0344 and p0340 code, along with esp light that causes jeep to go into limp mode Jeep cherokee grand 2008 p0325 codeCode p0748. a mechanic did a diagnostic and that's the code he gave me. 2008 jeep grand cherokee.

View Installation Deals. Best priced aftermarket parts for trucks, Jeeps, SUVs & ATVs at 4 Wheel Parts Denton, TX. DIY or experience the ease of tailoring your vehicle with our …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 ...P0128 is an extension of OBD-II code P0 which indicates a problem with your car’s coolant thermostat. P0 codes are displayed as P0XXX, with the third numeral in the code sequence signifying ...The P0128 code in a Jeep Compass usually points to a problem with the thermostat or, less commonly, the coolant temperature sensor. By following the steps outlined above, you can diagnose and fix the issue, ensuring your vehicle runs efficiently and remains in good health.SpottyJ. 212 posts · Joined 2013. #2 · Feb 4, 2020. I have a 2013 Wrangler JK, last week, at 87K, it threw Code P0305. Started running rough at idle. Bought it dealer, after they tore it apart, they confirmed a bad head. They said new head is …Discover the ultimate guide on how to reset the notorious P0128 code on your beloved Jeep Wrangler. Skip to content. How to Reset the P0128 Code on a Jeep Wrangler. By Matt Howard / October 25, 2023 . ... However, it is essential to remember that resetting the code does not fix the underlying issue causing the code to appear.How to Fix a Dodge, Chrysler & Jeep P0128 engine code: Thermostat Rationality or Coolant thermostat – coolant temperature below the thermostat regulating tem...

How to change the thermostat on the 2015-2022 Jeep Grand Cherokee 3.6L v6. Check engine code P0128. IG: Ljs_Garage_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...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.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 ...The Cost Of Repairing P0128. In order to fix the underlying issue associated with the Honda P0128 code, one or more of the following repairs may be necessary. Depending on the type of repair, the estimated cost of repair includes both the cost of the necessary parts and the cost of labor. The purge control valve is faulty; Valve for venting is ...Causes of P0128 Code. 1) Faulty Thermostat. 2) Insufficient Coolant. 3) Bad Coolant Temperature Sensor. 4) Damaged Wires. 5) Faulty Radiator Fan. 6) Bad Intake Air Temperature Sensor. 7) Coolant Flow Restriction. 8) Contaminated Coolant.

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If you are a car owner, you may have encountered the dreaded check engine light at some point. One of the common trouble codes that can trigger this warning is the P0128 code. This...Jeep Compass P0128 Repair Cost. P0128 code causes 3 different problems on parts: main reason thermostat, coolant temperature sensor and top off coolant. If you replace all the parts it will cost around $350 - $550. If you need to change them one by one it will cost. Jeep Compass Thermostat $220-$260 ...Diagnose P1128 Chrysler vehicles Diagnose and fix P1128 Chrysler, Dodge, Jeep. A P1128 Closed Loop Fueling Not Achieved - Bank 1 means that the PCM isn't seeing the O2 readings it needs to change from open loop (default factory programming determines air/fuel mixture) to closed loop (PCM varies air/fuel mixture based on live readings from all sensors).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 …Wrangler jeep overview. 2013 jeep wrangler sport 4x4 stock # p1345 for sale near scottsdale, azJeep wrangler code thermostat p0128 cherokee replace New car models: jeep wrangler 20142012-2016 jeep wrangler / cherokee. Jeep wrangler 2012 gets pentastar 3.6-litre v6 .

U0414 code . took in to dealer and the y replaced it $477.83 and I didn't make it off the lot and it's doing the same thing. in limp mode and not shifting. now they say that the transfer control module that they just put on is not getting fire. so now he tells me I need a fuse box, says it has a crack in it.Common Reason: Code P0172 is often related to a vacuum leak. Combustion engines run most efficiently when they maintain an air-fuel mixture ratio of 14.7 parts air to 1 part fuel. Too much air and/or too little fuel results in the engine running lean setting P0171 or P0174 trouble codes, while too much fuel and/or too little air results in the ...The automobile fault code P2459 indicates a problem with the diesel particulate filter regeneration system. The estimated repair time for this fault code is 1.0 hour. The cost of fixing this issue can vary depending on the auto repair shop, but it is common for them to charge between $75 and $150 per hour. Other factors that may influence the ...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.How do I fix code P0128 on a Jeep Grand Cherokee? The best way to fix P0128 is to find the root cause of the problem and repair it. A quick diagnostic process for a p0128 is: Define the code. Check your coolant (with a cold engine. Never open the cooling system when the engine is hot)Hey Everyone -. My 2005 KJ threw code P0128 this morning. Did a net search and found this code to be "P0128 Coolant Thermostat" for a Jeep. Some other manufacturers refer to them as "Coolant Temp Below Thermostat Regulating Temp" / "ECT Below Thermostat Regulating Temperature". When I noticed the check engine light come on, I also noticed that ...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...Proven Methods to Troubleshoot and How To Fix Code P0128 . Troubleshooting a P0128 is focused on checking the cooling system of the car. DIY Fixes for P0128 Code: A Step-by-step Guide. Use an OBD-II scanner to check for errors. If there are any other codes other than P0128, resolve them first; Visually inspect the coolant reservoir and coolant ...

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.

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 ...Jun 14, 2020 · Labor: 1.0. To diagnose the P0128 Jeep 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. The P0118 code will put the engine ECM to go into a failsafe mode, which may cause the engine to run rough, or hesitate until the engine warms up to operating temperature. The failsafe mode may also cause excessive fuel consumption, carbon fouling of engine components, and various drive complaints, depending on the manufacturer's failsafe mode ...The most common repair reported to fix the P0128 DTC is a worn thermostat (which opens too early). The following components can result in this error …We had a check engine light on the Jeep. It was a P0128 which is a coolant code.The engine wasn't getting to temperature. I change the thermostat and that to...P0121 definition: Throttle Position Sensor (TPS) "A" Circuit Range Performance Problem. Issue Severity: HIGH - Stop driving immediately. Repair Urgency: Fix this code immediately (same-day if possible) to avoid being stranded. Diagnosis: It is important to complete the entire diagnostic process when diagnosing the P0121 code.Jeep thermostat p0128 dodge replace. Jeep 2014 (14) grand cherokee 3.0 v6 crd limited plus 5dr automaticCherokee 5dr P0128 replace thermostat 2.4l jeep dodge chrysler by the book. part 1.. Check Details Check Details. P0128 Replace thermostat 2.4L Jeep Dodge Chrysler BY THE BOOK. Part 1. Check Details. 2014 Jeep Cherokee Mileage Update: 2,896 ...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 …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.Meaning. In essence, the P0128 trouble code means that the engine coolant is not getting warm enough, quickly enough. What this boils down to is that there is a problem with the engine not reaching its operating temperature within a certain amount of time. The engine control module ( ECM) is what determines and governs the length of time that ...

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A mechanic may use several methods to diagnose a P0688 trouble code, including: Utilize an OBD-II scanner to check for a stored P0688 trouble code. Check for loose or corroded battery cables and cable ends. Check that the battery is fully charged. Perform battery load test. Perform a battery starting/charging system test. Check for damaged fuses.Diagnose and fix jeep wrangler p0457Jeep p0128 renegade thermostat Dtc p0128 how to replace the thermostat on a 2.4l jeep dodge chrysler2015-2018 jeep renegade code p0128 thermostat fix. P0128 antifreezeP0128: low temp code incident 2012 jeep grand cherokee/wrangler 3.6 thermostat p0128 codeJeep wrangler p0456: evap system - small leak.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 Jeep 4.0-liter engine uses a cast iron block and cylinder head. It comes in both an inline-6 and inline-4 cylinder version and the specifications vary, depending on the vehicle...How to Easily Fix the P0128 Code in Your Jeep Wrangler. The P0128 code is a common issue many Jeep Wrangler owners might encounter. It indicates that your vehicle's engine is operating at a lower temperature than what is considered optimal for efficient fuel consumption. This can lead to increased emissions, reduced fuel efficiency, and, if not ...Step 3. Remove the air make-up hose from the airbox cover (#1). Loosen the bolts for the band clamps on the flexible air intake tube (#2) and on the airbox cover (#3). Remove airbox hood and and put air filter element (#4) on the side. Next step is to remove the bottom half of the airbox.It is possible that some repairs will be required to fix or diagnose the underlying issue of Jeep P0128. A repair’s cost will be determined by the cost of the necessary parts and labor. If you want to make your own diagnosis and repair, follow these steps. The most common cause of P0128 is an open coolant thermostat in an engine.P1607 what the hell - JK-Forum.com - The top destination for Jeep JK and JL Wrangler news, rumors, and discussion. Stock JK Tech - P1607 what the hell - Code popped 1607 looked it up said it was a PCM internal shutdown timer rationality too slow, I couldn't even begin to figure out what that whens any body got an idea and how to fix it?To use remote start on a Jeep Cherokee, press and release the remote start button on the transmitter two times within five seconds. The vehicle’s doors lock, the parking lights fla...Um, yes. Monday morning, 9/12/22, on my way to work my check engine light came on. Panic mode. Got it diagnosed…..code p0128. Researched it as best I could. Low priority fix, thermostat most likely stuck open. Have driven it everyday to work since Mon day, appx 45 miles per day. Had to make a before work stop at Walmart this morning. ….

Wrangler jeep airbag over cherokee grand petrol launch drivespark recalled issues detaches signal pulled sensor certain wiring crash conditions impactDiagnose and fix jeep wrangler p0457 Jeep wrangler reviews consumer used unlimited edmunds suvDtc p0128 how to replace the thermostat on a 2.4l jeep dodge chrysler. Check Details Fiat chrysler ...P0128 Jeep Wrangler Code. Jeep wrangler p0128 coolant code temp thermostat below powertrain generic regardless means which P0128 cherokee Jeep wrangler p0128: coolant thermostat - below temp. 2012 Jeep Grand Cherokee/Wrangler 3.6 Thermostat P0128 code - YouTube. 2012 jeep grand cherokee/wrangler 3.6 thermostat p0128 code . Check DetailsHowever, the Diagnostic Trouble Codes (DTC) were enough to put the Jeep into limp mode. U0414 - Invalid Data Received From 4-Wheel Drive Clutch Control Module. C1405 - Transfer Case Range Position Sensor Circuit High. I did a Google search for U0414 and came up with a posts in some Jeep forums indicating it is a bad transfer case switch.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. We'd had this problem for years.=====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code P0158 Saving Repair Parts...Step 3. Remove the air make-up hose from the airbox cover (#1). Loosen the bolts for the band clamps on the flexible air intake tube (#2) and on the airbox cover (#3). Remove airbox hood and and put air filter element (#4) on the side. Next step is to remove the bottom half of the airbox.Jeep Varsity P0128 Repair Cost. P0128 code causes 3 different problems on parts: main reason thermostat, coolant temperature sensor and top off coolant. If you replace all the parts it will cost around $350 - $550. If you need to change them one by one it will cost. Jeep Varsity Thermostat $220-$260 ...Definition: Coolant thermostat malfunction—coolant temperature is running below the regulating temperature. The P0128 engine code indicates a problem with your car’s coolant thermostat, which is responsible for ensuring the engine warms up quickly enough after ignition to control emissions and fuel efficiency. Jeep p0128 fix, P0128: low temp code incident Jeep wrangler p0304: cylinder 4 Misfire wrangler. 2012 Jeep Grand Cherokee/Wrangler 3.6 Thermostat P0128 code - YouTube Code p0128 problem jeep wrangler 2012-2016 jeep wrangler / cherokee. P0153 again!Diagnose and fix jeep wrangler p0457 Jeep wrangler code thermostat p0128 cherokee replaceP0128 code 2013 jeep wrangler., Even some cooling systems with dual coolant temp sensors when one temp sensor goes bad it always sets a different code and not P0128. Your not getting the fact that at dead center (temp guage) the coolant temp is somewhere between 178 degrees and 229 degrees,half that range is "under normal operating temps"., The Honda code P0128 indicates a problem with the engine coolant temperature sensor. It means that the sensor is reporting insufficient temperature increase during the engine warm-up period. This could be due to a malfunctioning sensor, a thermostat stuck in the open position, or a problem with the engine control module., Ask Your Own Jeep Question. The codes you're getting indicate you have two separate issues going on here, one is the code P0128 which is a Thermostat Rationality which set in most cases due to a failing engine thermostat. This can be checked by monitoring the engine temp on your scan tool to make sure it reaching normal operating temp., P0171 definition: Bank 1 has too much air or not enough fuel. Issue Severity: MODERATE- Extended driving with this code can cause internal engine damage. Repair Urgency: Get this code fixed as soon as possible to avoid damage to spark plugs, pistons, and catalytic converters. Diagnosis: It is important to complete the entire diagnostic ..., How to Fix Trouble Code P0339 for Jeep JK Unlimited Rubicon 3.6L. Jeep wrangler Wrangler p0456 evap obdii P0128 jeep jk diagnostic code, thermostat replacement. P0128 code 2013 jeep wrangler. Wrangler jeep p0304 code misfire relatively obd2 trouble includes common vehicle anyJeep wrangler p0304: cylinder 4 2017 jeep wrangler p0306How to fix ..., P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature). 2017 Jeep Wrangler Unlimited - Answered by a verified Jeep Mechanic. ... Jeep. Have Jeep questions? Ask a Jeep repair expert for answers. Connect one-on-one with {0} who will answer your question., I have been just ignoring it as it goes away after a few cycles, or I erase it with Jscan. In the beginning after a few codes it logged a P0128 Permanent Fault Code that never goes away when erasing the new code. Now that it's time for smog check I have to fix this and have ordered a new MOPAR thermostat and some fresh coolant., 11 posts · Joined 2013. #19 · Jul 22, 2022. P0128 is pretty common. Even a low coolant level has thrown the code in mine. Luckily when the t-stat fails, it fails open instead of closed, so at least the coolant keeps flowing. On my 2013 JKUR the t-stat isn't a separate item, and I am pretty sure that is the norm., This video goes through Troubleshooting for a P0128 engine code. We go through what problems may be associated and how we decided to change the thermostat vs..., 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 temperature., Wrangler jeep airbag over cherokee grand petrol launch drivespark recalled issues detaches signal pulled sensor certain wiring crash conditions impactDiagnose and fix jeep wrangler p0457 Jeep wrangler reviews consumer used unlimited edmunds suvDtc p0128 how to replace the thermostat on a 2.4l jeep dodge chrysler. Check Details Fiat chrysler ..., 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 ..., P0128 mercedes: (causes & fix) how long can you drive with a p0128 codeP0128 fixes P0128 dodge code magnum engine check lightP0113 code: iat sensor issue (symptoms, causes, and how to fix). P0128 dodge code caravan grand 2008 thermostatP0113 mechanic Toyota check engine code p0128My check engine light came on my scan tool gave me a code of p1756., 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. On the hunt for a replacement., 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 ..., Fixing Jeep engine code P0128 Depending on the root cause, fixing engine code P0128 on a Jeep may involve replacing a faulty thermostat, topping up the coolant levels, replacing the engine coolant temperature sensor, or repairing any issues with the cooling system. It's recommended to consult a certified mechanic for accurate diagnosis and ..., How do I fix the p0128 code For the Jeep Grand Cherokee? ... How Much Does It Cost to Fix P0128. How much you will pay depends on the cause of the problem. Let's say the code is triggered because of a temperature sensor. In …, Fixing P0128 in the Jeep Grand 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 …, P0118 definition: H02S2 Heater Control Circuit Low (Bank 2, Sensor 2) Issue Severity: SERIOUS – Stop driving immediately. Repair Urgency: Fix this code immediately to avoid serious engine damage. Diagnosis: This trouble code will put your vehicle into a failsafe mode, which may cause your car’s engine to hesitate and run rough. Other ..., I am having same problem 2006 4.0 auto throwing codes P0218 & P0714 hard shift from 1st to 2nd for the first couple shifts then it's fine after that till it sits for a few hours , can disconnect battery and hook back up all is good for a while use to last weeks or even months but seems to only last a day or hours now then it's back., Watch as I replace the thermostat on my 2015 Jeep Wrangler Unlimited after getting the P0128 Error Code., ** Click "Show More" to Learn more about this video **=====Check out our NEW Website for 2023!!https://www.milehighcampers..., Description of vehicle trouble code P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat ... make and model, it is advisable to check for TSBs because if there is a known fix set out by the automaker, it can save you time and money in the ... codes P013A and P0128 2007 Jeep Commander 5.7 Hemi My Jeep is throwing ..., 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. 1. Lack of heat– The most prominent symptom of the P0128 trouble code in the Jeep … See more, P0171 definition: Bank 1 has too much air or not enough fuel. Issue Severity: MODERATE- Extended driving with this code can cause internal engine damage. Repair Urgency: Get this code fixed as soon as possible to avoid damage to spark plugs, pistons, and catalytic converters. Diagnosis: It is important to complete the entire diagnostic ..., 2017 Jeep Renegade OBDII Code P0128 - Coolant Temperatore Below Thermostat Regulating temperature Weather during readings - Sunny, 38F outside Weather during first check engine light appearance - Sunny, 34F outside I am trying to diagnose the exact cause of the issue at present., 2015-2018 Jeep Renegade code p0128 thermostat fix - YouTube. Jeep wrangler p0456: evap system - small leak P0128 antifreeze Jeep p0128 renegade thermostat. Wrangler p0456 evap obdii. P0128 code 2013 jeep wranglerP0128: low temp code incident 2012 jeep grand cherokee/wrangler 3.6 thermostat p0128 codeP0128 code temp incident low. P0128 ..., What Does Code P0456 Mean? P0456 definition: Evaporative emission control system leak (small).; Issue Severity: LOW – Continued driving for a short period of time is okay Repair Urgency: Get this fixed within the next month to prevent drivability problems and excessive fuel consumption. Diagnosis: It is unlikely the driver will notice …, The Jeep 4.0-liter engine uses a cast iron block and cylinder head. It comes in both an inline-6 and inline-4 cylinder version and the specifications vary, depending on the vehicle..., By Team AutomadeSimply Updated on October 28, 2023. Have you seen a confusing P0128 code pop up on your Jeep Wrangler’s dashboard lately? That little …, 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 ..., 11 posts · Joined 2013. #19 · Jul 22, 2022. P0128 is pretty common. Even a low coolant level has thrown the code in mine. Luckily when the t-stat fails, it fails open instead of closed, so at least the coolant keeps flowing. On my 2013 JKUR the t-stat isn't a separate item, and I am pretty sure that is the norm.