Jeep p0128 fix

Do the following to fix Chevy code P0128. Check the coolant level: If the level is lower than the minimum, add more coolant and go for a short drive. If the code is still active, you must change the thermostat. Inspect the coolant temperature sensor: The primary coolant temperature sensor is in the cylinder head near the thermostat.

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 ...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 any symptoms with check engine light code P0456 other ...Popular Mechanics Magazine provides several possible solutions to fix the P0128 code in a 2014 Jeep Grand Cherokee. These solutions include checking the coolant levels and replacing the thermostat if necessary, inspecting the engine’s cooling system for any leaks or blockages, and ensuring that the engine’s temperature sensor is functioning properly.First, check the coolant level in your vehicle. If it's low, top it off to the recommended level. A common cause of the P0128 code is a faulty coolant thermostat. It's essential to replace the thermostat if it isn't functioning properly. This is typically a straightforward repair that doesn't take very long.Since fixing a P0128 code requires relatively lower repair costs, fixing it to avoid major troubles down the road is always worth fixing. The only scenario indicating that it's not worth fixing a P0128 is when your vehicle has other more complications that are not worth fixing.Diagnostic and Repair Procedures for Jeep code P0128. To diagnose and repair the P0128 code, you can follow these steps: Start by checking the engine coolant level and condition. If it is low, top it up and inspect for any visible leaks. Test the thermostat to ensure it opens at the specified temperature range. Replace it if necessary.In this video I go over some updates I have implemented into the 2.4L thermostat replacement procedures. Take notes to make job a littler easier,

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 temperature. How to Replace a Thermostat (video).The cost to diagnose the P1607 Jeep code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.P0125 is the OBD-II generic code for the engine computer, or Engine Control Module (ECM), not detecting enough heat in the cooling system before the fuel management system can take control. The ECM has a predetermined value after you start your vehicle to expect a certain coolant temperature. Your vehicle may have other codes, such as P0126 or ...The average cost for a Jeep Cherokee Thermostat Replacement is between $452 and $468. Labor costs are estimated between $62 and $78 while parts are typically priced around $390. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed. For a more accurate estimate based on your ...Jun 14, 2020 · How to Fix. Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins. Search for P0128 Jeep Questions and Answers. Retrieve and diagnose your check engine codes on a jeep wrangler yj2012 jeep jk 3.6l check engine code p06dd P0128 code temp incident lowHow to fix jeep p0300 engine code in 3 minutes [2 diy methods / only $4.. Check Details Check Details. Retrieve and Diagnose your Check Engine Codes on a Jeep Wrangler YJ. Check Detailstrailhunter. 1858 posts · Joined 2013. #2 · Aug 22, 2018. From the internet. There are two main*causes*for*P0128: The most common*cause*is an engine coolant thermostat that has stuck open or is opening prematurely. The next*cause*is a problem with the engine coolant temperature sensor or the wiring associated with the sensor.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, …

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.Nov 6, 2018 · The P0128 OBD II trouble code indicates that your Jeep Grand Cherokee’s engine coolant temperature has not reached its required operating temperature within a certain amount of time after starting the vehicle. This code can appear as soon as you start your vehicle, or it can also occur while driving. It’s essential to address this issue ... What Does Code P0158 Mean? P0158 definition: O2 Sensor Circuit High Voltage (Bank 2, Sensor 2); Issue Severity: MODERATE- Extended driving with this code can cause internal engine damage. Repair Urgency: Get this code fixed as soon as possible. Diagnosis: It is important to complete the entire diagnostic process when diagnosing the P0158 code.This DTC can be triggered by a faulty oxygen ...7 Mar 2021 ... Comments2 ; P0128 Jeep Wrangler | How To Replace Jeep Wrangler Thermostat | bleeding coolant system | Location. Mile High Campers · 173K views.P0128 code temp incident lowJeep p0113 wrangler code temp sensor location sending unit pcm causes circuit iat engine voltage wk firewall 2005 ask question Engine code help p04562012 jeep grand cherokee/wrangler 3.6 thermostat p0128 code.There can be different reasons causing the P0301 code to show up in your Jeep. Symptoms of a P0301 code vary depending on the cause. Here are some common symptoms of a P0301 code: A hard start or no start. Decrease in power. More fuel consumption. Stalling periodically, especially when the vehicle is idle. Rough idling.

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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!The cost to diagnose the P0118 Jeep code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.Jeep Cherokee 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.Fixing P0128 in the Buick Lucerne 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 …

P0128 ECT Sensor Below Thermostat Regulating Temperature. P0420 Catalyst System Bank 1 Low Efficiency. P0455 EVAP System Large Leak (0.080") Detected. For the 'P0128' your engine isn't getting up to operating temerature. This could be because of a low coolant level or your thermostat is stuck open.P0125 is the OBD-II generic code for the engine computer, or Engine Control Module (ECM), not detecting enough heat in the cooling system before the fuel management system can take control. The ECM has a predetermined value after you start your vehicle to expect a certain coolant temperature. Your vehicle may have other codes, such as P0126 or ...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 ...P0340 definition: Camshaft Position Sensor Circuit Malfunction. Issue Severity: SEVERE - Stop driving immediately. Repair Urgency: Fix this code immediately (same-day if possible) to avoid internal engine damage. Diagnosis: The vehicle may be difficult to start and the driver may also experience a lack of power when driving.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.2013 jeep wrangler code p0128. P0455 jeep grand cherokee code fixJeep grand cherokee, customer states, check engine light on, p0128... .. Check Details Check Details. P0128 Jeep Cherokee. Check Details. 2015 Jeep Wrangler P0128. Check Details. 02 jeep grand Cherokee 4.7. Dead miss started suddenly. Have codes p0351 p0353. Replaced coils. Check ...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.Learn effective ways to fix a muddy yard and turn it into a beautiful, functional outdoor space. Get expert tips and DIY solutions to tackle the problem. Expert Advice On Improving...

Jeep cherokee grand srt oilOil reset » blog archive » 2016 jeep grand cherokee oil change reminder Superior adaptive cruise controlJeep grand cherokee, customer states, check engine light on, p0128. Introducir 81+ imagen engine code p0128 jeep wrangler - Thptnganamst.edu.vn. Check Details. Cherokee grand chrysler suvs fire jeep recalls risks over

High or low engine temperature or a faulty thermometer are the usual causes of trouble code P2181. Overheating can ruin an engine in a matter of minutes, whereas an engine running too cool could be slightly less urgent. Try to normalize engine temperature as soon as possible. Some car makes and year models erroneously throw code P2181.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 engine and the coolant.Misfire jeep fix 2012 jeep grand cherokee/wrangler 3.6 thermostat p0128 code P0128 antifreeze 2016 jeep wrangler release date,colors,truck,interior,specsJeep grand cherokee code p0128: how to change thermostat on 3.6l v6 Cherokee jeep altitude grand review drive test 4wd trim consumer guide arrived charge destination including truck Used 201. ... how to fix. P0128 Thermostat change - Dodge Jeep Chrysler RAM - DIY Fix - YouTube. Check Details.The P0128 code in Jeep Wranglers is a common issue that owners can often resolve with some basic troubleshooting and repairs. By understanding what causes this code, diagnosing the problem accurately, and taking the appropriate steps to fix it, you can ensure your Jeep runs efficiently and avoid potential damage to your engine.Faça o seguinte para corrigir o código Chevy P0128. Verifique o nível do líquido refrigerante: Se o nível estiver abaixo do mínimo, adicione mais líquido refrigerante e faça uma curta viagem. Se o código ainda estiver ativo, você deverá trocar o termostato. Inspecione o sensor de temperatura do líquido refrigerante: O sensor ...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...c.d.c. 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 …

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The first and most common cause for the P0128 code is a faulty thermostat. The thermostat can get stuck in an open position, preventing the coolant from ever reaching the optimal operating temperature. However, you should check the coolant level first as it can also trigger the P0128 fault code. While you’re at it, make sure that your car is ...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 replace thermostat 2.4l jeep dodge chrysler by the book. part 1 2014 jeep grand cherokee thermostat location/jeep check engine light on p0128/thermostat Revs institute. P0128 Jeep Grand Cherokee: Meaning, Causes, How to Fix | Drivetrain Resource P0455 jeep grand cherokee code fix P0128 jeep cherokee. Jeep thermostat p0128 replaceJeep ...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 ECM, an electronic control unit placed in the engine ...If you own a Jeep, it’s crucial to stay informed about any potential recalls that may affect your vehicle’s safety and performance. One of the most effective ways to do this is by ...Fix The Code P0128. So, how can you fix the code P0128 in your Mercedes Benz? You have to first replace the thermostat valve. If the temperature does not regulate even after that, you might have to replace the sensor that is reading the coolant temperature. A problem with the sensor is not common, so the valve is always repaired or replaced first.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...=====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈== How to Fix P0420 =====Engine Code P0420 Saving Repair Part...Since fixing a P0128 code requires relatively lower repair costs, fixing it to avoid major troubles down the road is always worth fixing. The only scenario indicating that it's not worth fixing a P0128 is when your vehicle …1 post · Joined 2022. #1 · Mar 4, 2022. 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 ...Popular Mechanics Magazine provides several possible solutions to fix the P0128 code in a 2014 Jeep Grand Cherokee. These solutions include checking the coolant levels and replacing the thermostat if necessary, inspecting the engine's cooling system for any leaks or blockages, and ensuring that the engine's temperature sensor is functioning properly. ….

P0128 Definition: Coolant Temp - Below Thermostat Regulating Temp. The P0128 OBD-II trouble code is a generic powertrain diagnostic code (it has the same meaning for the Ford F350 as any other vehicle). Coolant Temperature. The coolant temp sensor is responsible for telling the Engine Control Module (ECM) the engine's coolant temperature.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 ...Feb 22, 2024 · The P0128 code can be set while the PCM is monitoring engine warm-up. The PCM draws from a few key pieces of data during this time to maximize engine efficiency, including the Engine Coolant ... 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 any symptoms with check engine light code P0456 other ...prior info - 2012 wrangler, 2.5 inch lift, 35s , traildash , 3.21's Ive been searching and there's some other instances of this code, but no one really says how they fix it.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.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...2000 jeep grand cherokee 4.7. codes. p1596, p0204, p0207. how to repair?Cherokee p0335 fault codes crankshaft P0128 jeep cherokee 2.4l thermostat. watch how to replace in part 2Jeep ba16. Jeep engine grand diagram cherokee 2000 p0171 patriot intake control manifold air wiring pat 1999 van9-24-13 2008 jeep grand cherokee 3.7 code p0325 part 2 ...Wrap Up. To fix the P0480 fault code, start by visually inspecting the wiring harness and connectors. Look for any damage or corrosion. Check the fan control relay and cooling fan for any faults. Make sure all connectors are intact and not bent or corroded. Address any issues found to resolve the problem. Jeep p0128 fix, 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 ..., 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..., 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..., 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..., 4221 posts · Joined 2019. #58 · Jan 27, 2023 (Edited) This P0128 code and indication of an ECT sensor and/or failing thermostat have been showing up on other GM vehicles like the Colorado/Canyon and Camaro cars that use the same 3.6L LGX engines and same symptoms., P0128 Code: Low Thermostat Temperature (Causes and How to Fix) Check Details. P0128 Jeep JK Diagnostic Code, Thermostat Replacement - YouTube. Check Details. P0455 Jeep Grand Cherokee Code Fix - YouTube. Check Details. P1281 P0128 Thermostat 1999 Jeep Grand Cherokee 4.0 inline 6 - YouTube., Diagnostic Trouble Code (DTC) P0480 stands for "Fan 1 Control Circuit.". The engine cooling fan system is controlled and monitored by your vehicle's computer and various sensors. The PCM detects the temperature increase through the coolant temperature sensor. If the engine temperature reaches a certain value (may vary depending on the car ..., Dodge journey coolant temperature sensor location replacementHow to fix: code p0128 dodge caravan [detailed guide]] Dodge p0128 overheatingIntroducir 57+ imagen how to reset p0128 code jeep wrangler. Fix P0128 code on Dodge Grand Caravan by replacing the thermostat - YouTube. Check Details. How to replace a thermostat on dodge grand caravan, P0128 ck engine code. Our 2014 GC 3.6 just threw this code. The auto parts store read it for me and suspects the thermostat is stuck open. This is my wife's vehicle and she isnt sure if the temp gauge is usually in the middle of the range or not. I have attached a pic of where the temp gauge is after driving it., Why is my Jeep displaying the P0128 code after a recent repair? The P0128 code on your Jeep indicates a problem with the engine coolant temperature (ECT) sensor. It is possible that the recent repair did not fix the underlying issue causing this code to be displayed. The ECT sensor may need to be replaced or calibrated properly., P0128 Jeep Wrangler Code 23 Oct 2023. P0128 code 2013 jeep wrangler P0340 aed1 410c limp 2012 jeep grand cherokee/wrangler 3.6 thermostat p0128 code. 2012 Jeep Grand Cherokee/Wrangler 3.6 Thermostat P0128 code - YouTube. P0128 antifreeze Jeep cherokee p0128 4l P0128 code temp incident low. Intermittent p0344 and p0340 code, along with esp light ..., 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 thermostat rational..., Due to factors beyond the control of RB The Mechanic, it cannot guarantee against unauthorized modifications of this information. RB The Mechanic assumes no ..., 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 ..., While it might not spell immediate trouble for your vehicle, a P0128 fault code could lead to larger issues down the line with your engine's temperature. ... How to fix a P0128 code on your car., Fixing P0128 in the Chevy Sonic 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 coolant ..., Just bought a 2015 jeep grand Cherokee last week with 99k miles. It is the 3.6L v6. No check engine light when I drove off the lot. ... Keep an eye on your coolant level, if it keeps dropping, that likely is causing the P0128, fix the coolant loss and that likely will fix the P0128. Save Share. Like. mdsweitz00 Discussion starter, The repair or fixing cost of the P06DD code varies according to the vehicle model, labor cost, and the cause of the problem. To fix or repair the P06DD code, you may need one or more of the following repairs: Parts. Cost. Engine oil pump assembly replacement. $290 to $2600. Oil pressure sensor replacement. $70 to $270., The first and most common cause for the P0128 code is a faulty thermostat. The thermostat can get stuck in an open position, preventing the coolant from ever reaching the optimal operating temperature. However, you should check the coolant level first as it can also trigger the P0128 fault code. While you’re at it, make sure that your car is ..., Apr 4, 2023 · 1) Warm engine up for five minutes (must reach closed loop) 2) Drive (with steady throttle) at a speed between 40 and 60 mph for 8 minutes. 3) Stop and idle for 3 minutes. 4) Drive (with steady throttle) at a speed above 20 mph for 2 minutes. 5) Turn key off, leave off for ten minutes (to run O2 sensor heater monitor). , The cost to diagnose the P1607 Jeep code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour., In this video I go over the replacement process of the thermostat found on the 3.6L Pentastar V6 engine. The Chrysler Jeep Dodge Ram vehicles. DODGE 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 ..., 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 ..., The P0128 diagnostic trouble code is often a result of a stuck engine coolant thermostat. Check the coolant hose and the temperature of the coolant flowing through it. Be careful …, 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 ..., 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?, How to Fix. Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins. Search for P0128 Jeep Questions and Answers., 1 post · Joined 2022. #1 · Mar 4, 2022. 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 ..., 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..., Jul 1, 2023 · In this guide, let us delve into error code P0128 — its meaning, indicators, triggers, and fix. 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 performance issues. Reduced HVAC efficiency and fuel mileage. , Apr 18, 2018 · Fault Code P0128 advice. Hi all... got a P0128 fault this morning. Using Torque and a cheap bluetooth OBD reader, Torque states: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature). Ensured radiator and reservoir were appropriate levels (quick/easy fix). Tried the 3 trip reset afterwards, no change. , 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!