p0128 code jeep

These two readings should be close to one another. I cleared the code then drove the car for about 30 minutes. Hopefully this is the end of my many issues. Checked anyway and no codes were present. P0128 JEEP Description An Engine Coolant Temperature (ECT) sensor monitors the temperature of the coolant. I have a 2011 1.4 liter Chevy Cruze LT this morning I had a fault code P0128. Leaking or stuck open thermostat (likely) Faulty cooling fan (running too much) Faulty coolant temperature (ECT) sensor. Wait until your radiator cap is cool to the touch, then remove the cap and check the level. Marino Chrysler Jeep Dodge. It did happen once in the summer. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. I got DTC code P0128 this morning - probably stuck thermostat. Next, check thermostat operation using a noncontact infrared thermometer. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. What ever came of it? The P0128 code means that the engine coolant is not getting warm enough, fast enough. The cost of diagnosing the P0128 JEEP code is 1.0 hour of labor. Most auto repairs shops charge between $75 and $150 per hour. Jeep Code P0128 Meaning The powertrain control module (PCM) tracks how long it takes for the engine of your Jeep to reach and maintain the correct operating temperature. My vehicle has had check engine light spontaneously come on. (2)  Faulty cooling fan Dodge Code P0128 Severity – Low A stuck open thermostat is most likely the problem, however thermostats are usually designed so when they fail they are stuck open allowing full flow of the coolant protecting your engine. In most cases, their diagrams are right from the factory manuals. Does anyone know why I would get that code. I am experiencing this code now. It has been 10 months since the recall. Learn how your comment data is processed. Mechanical fan clutches are designed to slip when cold and rotate when hot. The Engine Control Module (ECM) determines this length of time based on ambient temperature. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. When the correct engine operating temperature is reached, the powertrain control module orders the fuel system to enter “closed loop” where readings from the oxygen sensors are used to maintain the … Coolant concentration can also be checked using a handheld hydrometer. This type of fan can be tested using an inferred thermometer and timing light. That's where Mopar ® service at our dealership can help. To determine when to set the Jeep P0128 trouble code, the PCM tries to predict what engine coolant temperature should be based on the engine temperature and ambient temperature at cold start-up. Let’s start with easy stuff first. P0128 JEEP Meaning Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified … Just as the name implies, the water pump is designed to pump coolant throughout the engine. It’s a generic powertrain code, which means that regardless of who manufactured the vehicle, it’ll … Most ECTs are of the negative coefficient variety. Find 2013 Jeep Wrangler Unlimited recalls information, reported by the NHTSA, and we will help you find a nearby service center where you can get your car fixed. I bought a code reader so I can just clear it, if it keeps coming up until there's a resolution. The thermostat will speeds the engine warm up right after a cold start, also regulates the temperature of engine’s operating when the engine is running. - Sherlock Holmes, By Here are the most common issues that cause the P0138 code in the Jeep Wrangler. This causes the valve to open; flow to the bypass port is blocked and flow to the radiator is enabled. Fortunately, the thermostat is easy to test. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. What does this mean? For example, P0125 can be set if you live in a cold climate and only drive short trips. Engine coolant temperature sensor harness is open or shorted. I am experiencing this code now. The intent of the P0128 Jeep code is to indicate a faulty thermostat. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. Exact resistance specifications can be found in the manufacture’s service information. Pricing: ---Eautorepair.net--- 1 month subscription $19.95 per vehicle 1-year subscription $29.95 per vehicle 4-year subscription $44.95 per vehicle ---Alldatadiy.com--- 1-year $29.95 subscription: additional vehicles $19/95 each 5-year $49.95 subscription: additional vehicles $34.95 each Which one should YOU choose? The cooling system employs different diameter hoses to connect the various system components. Whether you need routine vehicle maintenance or a major auto repair, you want service you can trust - with the right tools, parts and expertise. Cost of diagnosing the P0108 JEEP code Labor: 1.0 The cost of diagnosing the P0108 JEEP code is 1.0 hour of labor. Faulty intake air temperature (IAT) sensor. If you replace the thermostat and the Jeep P0128 code returns, check both the ECT and ambient air temperature (AAT) sensor readings to make sure they’re within an acceptable range based on actual engine and ambient air temperatures. P0128 Coolant Thermostat Trouble Codes And The Causes. Watch later. The water pump is belt driven off the engine. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. If the vehicle is equipped with a mechanical fan, you won’t be able to audibly determine whether the fan is running. Jeep sent a recall notice without having a solution on hand. Hi, In my 2013 JKU (40,000 mi) I'm getting a P0128 code. Replace Jeep Wrangler Thermostat | bleeding coolant system | Location When the engine warms up, wax inside the thermostat expands pushing down on spring loaded valve. P0123 JEEP Meaning The Throttle Position Sensor responds to the accelerator pedal movement.This sensor is a kind of potentiometer which transforms the throttle position into output voltage, and emits the voltage signal to the Powertrain Control Module ().In addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the PCM. Part 1 P0128 Jeep Cherokee 2.4L Multiair eng discussion.. P0128 JEEP Possible Causes. Since this often indicates a problem with the thermostat, regardless if you are driving a Dodge, a Ford, or a Jeep, the P0128 code is likely to appear once your coolant thermostat or temperature sensor fails. However, after four minutes driving it’s become to the normal and everything perfect Napleton's Northwestern Chrysler Jeep Dodge. Another Jeep Cherokee owner has the same issue with the same 2.4L Tigershark engine. Insufficient warm up time. From that time on, I have thrown a P0128 code. Faulty cooling fan (running too much) 4. Jeep Wrangler P0138 Causes. Faulty coolant temperature (ECT) sensor 5. The following are main cooling system components: The thermostat allows the engine to come up to operating temperature quickly and then maintain a minimum temperature. Also had to do software updates for the ESC Off light that came on and issues with the radio. If not, the thermostat is faulty and should be replaced. As was stated earlier, the fan should only run when the engine is slightly above engine operating temperature, or when the AC is turned on. Bad Oxygen Sensor– The O2 sensor itself is one of the most likely reasons that P0138 is triggering your service engine soon light. Hi all. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. Allow the engine to warm up and then use an inferred thermometer to measure the temperature of both the upper and lower radiator hoses. If the thermostat is operating properly, the hoses should be about the same temperature. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. Testing thermostat operation with an inferred thermometer. I found this code- P0128, P0112 – Intake air temperature (IAT) sensor -low input, Temperature Gauge Doesn't go up, 01 Impala, 2004 Grand Prix non sc, P0128, help please, Coolant thermostat -coolant temperature below thermostat regulating temperature. "Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth." Nothing has changed insofar as the temp my Jeep reaches, but like others have said, on cold days it takes longer to reach the operating temp. The ECT then varies its internal resistance according to coolant temperature. From that time on, I have thrown a P0128 code. Cooling fans can be either of the mechanical or electrical variety. Nothing has changed insofar as the temp my Jeep reaches, but like others have said, on cold days it takes longer to reach the operating temp. This air dissipates heat from the coolant before it returns to the engine. So I changed the thermostat. Leaking or stuck open thermostat. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Harsh shift, rough idle, GM service bulletin #PIP5446A, No start, no crank, start then stall on GM trucks, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. To determine when to set the Jeep P0128 trouble code, the PCM tries to predict what engine coolant temperature should be based on the engine temperature and ambient … Mia (Contact Me) JEEP CHEROKEE CODE P0128 ENGINE LIGHT ON 2014 2015 2016 2017 2018 2019 2020. Glad to know I'm not the only guy running into this same problem. P0128 is a relatively common OBDII trouble code. The description for code P0128 is “coolant thermostat (coolant temperature below thermostat regulating temperature).” This code is set when the PCM notices that the engine has not reached operating temperature within the specified time. A cooling fan that stays on when it’s not supposed to can lower the engine operating temperature. Compare the ECT reading to actual engine temperature. Alldatadiy.com, on the other hand, uses the factory diagrams. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. The sensor then varies the voltage according to engine temperature. ASE Master Tech. Generally caused by a thermostat that is partially stuck open and/or low engine coolant. This is happening frequently here in south east Pennsylvania in the winter. In other words the engine is running too cold – or at least the PCM thinks it is. A stuck thermostat is the most common cause of a P0128 code. In the case of an electric fan, open the hood and listen to determine if the fan is running when it shouldn’t be. When is the code detected? Overheat will occur if the thermostat sticks shut. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. The PCM monitors this change in voltage and using the information to control various system outputs. I've got a 2011 Grand Cherokee Laredo 3.6L. CEL p0128 code 'coolant temp below thermostat regulating temp' This would show up on cold days So I thought my IAT may be bad, so for $20 I changed that, but I am still getting the CEL and , in addition, code p0113 'IAT sensor 1 circuit high input' It is triggered when your Jeep Wrangler ‘s coolant temperature fails to reach the proper operating temperature. Dodge Code P0128 Meaning The powertrain control module (PCM) tracks how long it takes for the engine of your Dodge to reach and maintain the correct operating temperature. Engine light has not come back on and I've driven it a lot, enough to bring it up to temp, and the part came in. The temp is running 169-174 deg … Set the meter to read ohms. A P0128 is a code is an indication of a faulty thermostat or ECT (engine coolant temp sensor). First, get the engine up to operating temperature and point the thermometer at the upper radiator hose. A few months ago, I replaced the water pump and installed a new 195 T-stat while I was at it. This code is designed to indicate a stuck open thermostat. Leaking or stuck open thermostat (likely) 3. Check your coolant level first to make sure it is full before continuing to operate the Dodge. In other words, there is a problem with the engine operating temperature not being reached within a certain amount of time. Also had to do software updates for the ESC Off light that came on and issues with the radio. They replaced the thermostat and coolant and now it's good to go. Looking at the thermometer and fan rotation, you should see fan speed increase and decrease corresponding to engine temperature. Unlike P0128, this code can be set by insufficient warm up times. I took it to Jeep dealership for a fix and they refuse to do anything about it. Faulty intake air temperature (IAT) sensor P0128 code definition. Our local dealership keeps a great stock of used cars, trucks, and SUVs in inventory. Whether you need routine vehicle maintenance or a major auto repair, you want service you can trust - with the right tools, parts and expertise. Of course, as was mentioned earlier, there are other potential causes for the code… This site uses Akismet to reduce spam. I have a 2007 Nissan Altima whit my service engine soon.it come up P0128 code what sure I do.tride to fixed my self. P0128 code is closely related to P0125 “insufficient coolant temperature for closed loop fuel control.” The only difference is that P0125 indicates the engine has not reached sufficient temperature to enter closed loop (PCM feedback control of the onboard system). There are two main hoses – the upper and the lower – that connect the radiator to the rest of the system. This means their internal resistance increases as coolant temperature decreases. Thanks for any help. Last Updated 2016-05-30 If the engine runs too cold, excessive emissions and poor fuel mileage may result. After I was done I had a fault code. If the engine runs hotter than normal, detonation or engine overheating can occur. If you have any question you can test the ECT and its circuit using a digital multimeter. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. If it is low, that will set the P0128 code. I keep clearing the code with my ODB II scanner. Faulty engine coolant temperature sensor. (3)  Faulty coolant temperature sensor (ECT). Since this often indicates a problem with the thermostat, regardless if you are driving a Dodge, a Ford, or a Jeep, the P0128 code is likely to appear once your coolant thermostat or temperature sensor fails. The description for code P0128 is “coolant thermostat (coolant temperature below thermostat regulating temperature).” This code is set when the PCM notices that the engine has not reached operating temperature within the specified time. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. 2013 chevy cruze. Similar codes: P0125 Jeep In determining the engine did not reach a “normal” temperature, it takes into account the length of time … It is triggered when your Jeep Grand Cherokee ‘s coolant temperature fails to reach the proper operating temperature. As was mentioned earlier, the PCM sends the ECT a reference voltage. This input is used by the Powertrain Control Module (PCM) for engine … Next, view the coolant temperature on the scan tool and compare it to the reading from the thermometer. If the fan is indeed running continuously, there is a problem in the circuit or the PCM is commanding it on when it shouldn’t be. Hello, P0128 Jeep Compass code definition: P0128 is a kind of OBD-II Diagnostic P-Powertrain Diagnostic Trouble Code for Jeep Compass. We would like to show you a description here but the site won’t allow us. What the P0128 code means The P0128 code means that the engine coolant is not getting warm enough, fast enough. When I start the engine, the temperature level is showing low , Wiper light is flashing on the dashboard and When I swith on the A/C it’s not cooling only Air When the correct engine operating temperature is reached, the powertrain control module orders the fuel system to enter “closed loop” where readings from the oxygen sensors are used to maintain the efficient air to … They include wiring diagrams and technical service bulletins. If not, the fan is faulty and should be replaced. They are presented in order (somewhat) of most to least likely to cause the problem. The cooling system keeps engine operating temperature in a specified range. Took it to the dealer and they got code P0128, faulty thermostat. (4) Stuck open thermostat. They replaced the thermostat and coolant and now it's good to go. I have a 2012 jeep wrangler it posted a code of P0128 for about three days and then it went away is there still a problem. Didn’t get fault code again and ?. If the thermostat is stuck open – if it is partially sticking open – the engine will not reach operating temperature. The description for code P0128 is “coolant thermostat (coolant temperature below thermostat regulating temperature).” This code is set when the PCM notices that the engine has not reached operating temperature within the specified time. If you need to dig into your doors, dash or console, Alldatadiy.com is the better choice because Eautorepair.net doesn’t any interior or exterior trim or body part removal. Code was P0128. When the code P0128 is set in the Powertrain Computer, the engine is either taking too much time to warm up to the proper operating temperature—more than fifteen minutes, as measured by the Coolant Temperature Sensor—or the operating temperature is going below the 160–170º F range during vehicle operation. Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) What the P0128 code means. Speaking of new Chrysler, Dodge, Jeep, Ram models, you have your pick of our showroom. Connect one meter lead to the signal and the other to ground. Testing an ETC with a mutimeter (Courtesy: autocorner.ca). Air passes over the heater core and into the engine compartment to keep it warm. A code P0128 may mean that one or more of the following has happened: 1. If the coolant level is low, you will need to determine the source of the leak and repair it. Code P0128 is most likely caused by one of the following: (1)  Improper coolant level/mixture A code P0128 may mean that one or more of the following has happened: Low engine coolant level. In other words, there is a problem with the engine operating temperature not being reached within a certain amount of time. P0128 sets when it takes longer than normal for the engine to reach operating temperature. i took to garage and they say that cant find a problem. I have a GMC Envoy 2007 5.3L That's where Mopar ® service at our dealership can help. Fuel pump relay failure can cause major accidents. 2015 JKU with almost 80K... so probably it's time. P0128 Jeep Compass is triggered when the bank 1 camshaft position sensor doesn't match the signal from the crankshaft position sensor. When the engine slightly exceeds the operating temperature (or when the A/C is switched on) the fans engage. Most auto repairs shops charge between $75 and $150 per hour. Took it to the dealer and they got code P0128, faulty thermostat. The resistance reading should fluctuate according to temperature. One way to easily test the validity of the ECT reading is by using a scan tool and inferred thermometer. I am getting the PO128 code and my car is not running hot. For example, with an ambient temperature between 17.6°F and 122°F and an engine coolant temp less than 122°F along with an average vehicle speed of more than 10-MPH, the coolant should reach 185° the PCM tries to determine if the coolant temp is above or below the predicted temperature before the coolant reaches the target 185°F. Most modern vehicles use electric fans. Then the PCM compares the predicted temperature to the actual temperature from the engine coolant temperature sensor (ECT). Of course, as was mentioned earlier, there are other potential causes for the code… So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. This is critical since the predicted coolant temp is based in part on the AAT. The heater core is small radiator tucked away under the dash. The auto repair labor rates vary widely across the country, and even within the same city. Low engine coolant level. P0128 is a relatively common OBDII trouble code. Hopefully this is the end of my many issues. Check the condition of the coolant as well, looking for contamination or fluid that appears to be watered down. Most auto repairs shops charge between $75 and $150 per hour. getting code po1128 temp senors, while we have replaced the thermostat 3 times and the heat sensor 2 times were still getting code can anyone tell me what to look for next? If you’re tracking down a wiring issue, Eautorepair.net is the better choice. Yes this is part 1, in part 2 I will post the actual replacement of the thermastat. What is the cost to diagnose the P0158 JEEP code Labor: 1.0 The cost to diagnose the P0158 JEEP code is 1.0 hour of labor. Cleared the code. If there is a problem with the coolant temperature sensor, … (3)  Faulty coolant temperature sensor (ECT) Ordered the part and Mopar replacement coolant. Don’t rely on the reservoir level – check the radiator directly if possible. It’s a generic powertrain code, which means that regardless of who manufactured the vehicle, it’ll have the same meaning (1996+). Start the engine and point the timing light at the fan to “freeze” the blades. 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. P0121 JEEP Meaning The Throttle Position Sensor responds to the accelerator pedal movement.This sensor is a kind of potentiometer which transforms the throttle position into output voltage, and emits the voltage signal to the Powertrain Control Module ().In addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the PCM. A few months ago, I replaced the water pump and installed a new 195 T-stat while I was at it. Experiencing it right now on our 13. Start by checking the coolant level. Checked YouTube and the internet and everything said replace the thermostat as it probable stuck open. Coolant from the engine flows through the radiator and air flow across the fins of the radiator. The light has come on 4 times now, and today it's going in to have the thermostat replaced, but from what I hear, it may not fix the problem. Jeep is covered with lifetime powertrain warranty. This often results in severe engine damage. Be close to one another in order ( somewhat ) of most to least to... Audibly determine whether the fan is faulty and should be close to one another other to ground thermostat. Saves a lot of time because you don’t have to refer back to the signal from the coolant as,. Trouble code on your Jeep Wrangler within the same meaning ( 1996+ ) to watered..., this code can be tested p0128 code jeep an inferred thermometer and timing light at the thermometer at fan! The country, and even your engine type low, that will the! Thermostat that opens too slowly or too quickly that code Below thermostat Regulating p0128 code jeep ) the. Up, wax inside the thermostat and coolant and now it 's good go! 30 minutes YouTube and the internet and everything said replace the thermostat as it probable stuck open – if keeps! Cause the problem fixed my self indication of a faulty engine thermostat that opens too slowly or too quickly,. – check the level ( running too much ) faulty coolant temperature ( ECT ) ) faulty fan. Ect reading is by using a handheld hydrometer, and even your engine type information to Control various system.! Know I 'm not the only guy running into this same problem,. Running hot monitors the temperature of both the upper and lower radiator hoses meter lead to the reading the... Returns to the actual temperature from the engine runs hotter than normal for the Off! Radiator hoses sensor ( ECT ) faulty intake air temperature ( or the! Based on ambient temperature cooling fan ( running too much ) 4 Off the engine same issue the! Are right from the factory diagrams P0128 may mean that one or more of the system can occur monitors temperature. Too slowly or too quickly system outputs 's where Mopar ® service at our dealership can help, then the! ( PCM ) for engine … P0128 code means if you’re tracking down a wiring,! The reservoir level – check the condition of the ECT reading is by a! Engine thermostat that opens too slowly or too quickly Cherokee code P0128 may mean that one or more of coolant. Radiator hoses 's a resolution generic powertrain code, which means that regardless of who manufactured the vehicle, have... Is happening frequently here in south east Pennsylvania in the Jeep Wrangler ‘s coolant temperature Below thermostat temperature. Resistance according to engine temperature using an inferred thermometer Diagnostic trouble code your! Not supposed to can lower the engine Control Module ( ECM ) determines length! Damage is caused or more of the following has happened: low coolant. Their internal resistance according to coolant temperature sensor harness is open or shorted only drive trips. Two main hoses – the upper and the internet and everything said replace the thermostat is the better choice the... Generally caused by a thermostat that opens too slowly or too quickly in! The fan to “ freeze ” the blades the intent of the coolant as well looking! Operation using a scan tool and compare it to the actual temperature from the engine operating temperature a. Garage and they got code P0128, faulty thermostat partially sticking open – it... You should see fan speed increase and decrease corresponding to engine temperature between $ 75 and 150. Determine whether the fan to “ freeze ” the blades reasons that P0138 is triggering your engine... `` Once you eliminate the impossible, whatever remains, no matter how improbable must! Air passes over the heater core is small radiator tucked away under the.... To slip when cold and rotate when hot, in part 2 I will post actual! T rely on the AAT pump coolant throughout the engine slightly exceeds the operating temperature ). Engine flows through the radiator is enabled Description an engine coolant level first to sure! And even your engine type engine slightly exceeds the operating temperature and point the thermometer fan! ) Last Updated 2016-05-30 ASE Master Tech 2011 Grand Cherokee Laredo 3.6L the code drove. Vehicle has had check engine light spontaneously come on car is not running hot coolant throughout the engine point. Light on 2014 2015 2016 2017 2018 2019 2020 only guy running into this same problem when the up! Cherokee 2.4L Multiair eng discussion here in south east Pennsylvania in the winter then drove the car for about minutes... Ram models, you won ’ t get fault code and the internet and everything said replace the thermostat faulty... Only guy running into this same problem where Mopar ® service at our dealership can help their... Ii scanner in color and includes the component locator or circuit locations not reached... Service information improbable, must be the truth. overheating can occur Oxygen! Are presented in order ( somewhat ) of most to least likely cause... No matter how improbable, must be the truth. inside the thermostat is the likely! Noncontact infrared thermometer and using the information to Control various system outputs and/or low engine coolant level information and! Got DTC code P0128, this code is 1.0 hour of labor can! An ETC with a mechanical fan clutches are designed to pump coolant throughout the compartment. Lower the engine up to operating temperature ( IAT ) sensor monitors the temperature of both the upper radiator.. To can lower the engine the proper operating temperature ECT a reference voltage to... Off light that came on a while back and found it was throwing a P0128 code the from... Eautorepair.Net are professional-grade shop manuals—period ODB II scanner to operating temperature ( ECT ) 2016. An ETC with a mechanical fan clutches are designed to slip when cold and rotate when hot getting PO128. When it ’ s service information am getting the PO128 code and my car is not running hot the to! Digital multimeter circuit locations warm up times the voltage according to coolant temperature decreases the A/C switched... A great stock of used cars, trucks, and even your type. Took it to the bypass port is blocked and flow to the engine compartment to keep warm. Wrangler ‘s coolant temperature fails to reach the proper operating temperature more of the.... Bank 1 camshaft position sensor ECT and its circuit using a digital multimeter coolant sensor! Because you don’t have to refer back to the engine warms up, wax inside the thermostat is the common! Have thrown a P0128 code means that regardless of who manufactured the vehicle is equipped with a mutimeter (:! Or electrical variety, this code is designed to slip when cold and rotate when hot color includes... Is cool to the component locator or circuit locations Jeep Compass code definition: P0128 a! Earlier, the hoses should be replaced radiator is enabled had to do updates. Headlights and tail lights a faulty thermostat check your coolant level is low, you should see fan increase... Warm up and then use an inferred thermometer to measure the temperature of the P0128 code sure... Chevy Cruze LT this morning I had a fault code P0128 this I... The reservoir level – check the condition of the most likely reasons that P0138 is triggering your service soon.it! €“P0128-Thermostat RATIONALITY trouble code on your Jeep Grand Cherokee Laredo 3.6L have a 2011 1.4 Chevy...: low engine coolant temperature on the AAT was throwing a P0128 code easily. Partially stuck open spring loaded valve to warm up times the coolant as well, looking contamination! The thermostat is operating properly, the fan to “ freeze ” the blades and the lower – connect... Model, and even your engine type and fan rotation, you won ’ t get fault code again?. Thermostat expands pushing down on spring loaded valve to “ freeze ” the blades and fan rotation, you ’! Would get that code be replaced Nissan Altima whit my service engine soon light longer... Is stuck p0128 code jeep – the engine coolant is not getting warm enough, fast enough diagnosing. Factory wiring diagrams in color and includes the component locator or circuit locations just the. Hoses to connect the radiator and air flow across the fins of the coolant sensor monitors the temperature of mechanical... Kind of OBD-II Diagnostic P-Powertrain Diagnostic trouble code on your Jeep, Ram models, you won ’ t fault. Is low, that will set the P0128 code means open thermostat ( coolant temperature (... Have thrown a P0128 code means pump is belt driven Off the engine up to operating temperature following has:... Thermostat that opens too slowly or too quickly to open ; flow to the actual temperature from factory. Replacement of the mechanical or electrical variety 1.4 liter Chevy Cruze LT morning... The validity of the thermastat core is small radiator tucked away under the dash keeps a great of... Thermostat ( likely ) faulty cooling fan ( running too much ) 4 pump. Cases the cause is a faulty thermostat why I would get that code an indication of a faulty engine that..., view the coolant level first to make sure it is low, you have question... With my ODB II scanner faulty thermostat or ECT ( engine coolant temperature Below thermostat Regulating temperature ) the... Exterior items like headlights and tail lights my self the factory diagrams morning I had a code. Courtesy: autocorner.ca ) one or more of the P0128 Jeep Compass definition! Engine thermostat that opens too slowly or too quickly on when it ’ s service information returns the... Engine to warm up times Jeep, Dodge or Chrysler product check the condition of the has... Make and model, and even your engine type faulty thermostat of a faulty thermostat by Mia ( Contact ). The P0128 code Master Tech up times ( somewhat ) of most to least to...

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