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    That's where Mopar ® service at our dealership can help. Fortunately, the thermostat is easy to test. 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' Similar codes: P0125 Jeep In determining the engine did not reach a “normal” temperature, it takes into account the length of time … They include wiring diagrams and technical service bulletins. Next, view the coolant temperature on the scan tool and compare it to the reading from the thermometer. When the engine slightly exceeds the operating temperature (or when the A/C is switched on) the fans engage. The auto repair labor rates vary widely across the country, and even within the same city. As was mentioned earlier, the PCM sends the ECT a reference voltage. Part 1 P0128 Jeep Cherokee 2.4L Multiair eng discussion.. I have a 2011 1.4 liter Chevy Cruze LT this morning I had a fault code P0128. These two readings should be close to one another. 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. A code P0128 may mean that one or more of the following has happened: 1. P0128 JEEP Meaning Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified … What does this mean? 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. In other words, there is a problem with the engine operating temperature not being reached within a certain amount of time. P0004. 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. 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. P0128 JEEP Possible Causes. Faulty intake air temperature (IAT) sensor The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. The cooling system keeps engine operating temperature in a specified range. The P0128 code means that the engine coolant is not getting warm enough, fast enough. This causes the valve to open; flow to the bypass port is blocked and flow to the radiator is enabled. If it is low, that will set the P0128 code. When the engine warms up, wax inside the thermostat expands pushing down on spring loaded valve. Set the meter to read ohms. If the engine runs hotter than normal, detonation or engine overheating can occur. If the vehicle is equipped with a mechanical fan, you won’t be able to audibly determine whether the fan is running. 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. Checked anyway and no codes were present. 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. Allow the engine to warm up and then use an inferred thermometer to measure the temperature of both the upper and lower radiator hoses. Faulty intake air temperature (IAT) sensor. In other words the engine is running too cold – or at least the PCM thinks it is. P0128 sets when it takes longer than normal for the engine to reach operating temperature. 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. 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. I am experiencing this code now. Testing an ETC with a mutimeter 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 … From that time on, I have thrown a P0128 code. However, after four minutes driving it’s become to the normal and everything perfect Cost of diagnosing the P0108 JEEP code Labor: 1.0 The cost of diagnosing the P0108 JEEP code is 1.0 hour of labor. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. Looking at the thermometer and fan rotation, you should see fan speed increase and decrease corresponding to engine temperature. ASE Master Tech. 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. Unlike P0128, this code can be set by insufficient warm up times. They replaced the thermostat and coolant and now it's good to go. 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). One way to easily test the validity of the ECT reading is by using a scan tool and inferred thermometer. - Sherlock Holmes, By 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. (Courtesy: autocorner.ca). For example, P0125 can be set if you live in a cold climate and only drive short trips. If the thermostat is stuck open – if it is partially sticking open – the engine will not reach operating temperature. Then the PCM compares the predicted temperature to the actual temperature from the engine coolant temperature sensor (ECT). However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. A few months ago, I replaced the water pump and installed a new 195 T-stat while I was at it. Check your coolant level first to make sure it is full before continuing to operate the Dodge. It is triggered when your Jeep Wrangler ‘s coolant temperature fails to reach the proper operating temperature. 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. Most auto repairs shops charge between $75 and $150 per hour. The heater core is small radiator tucked away under the dash. The temp is running 169-174 deg … Coolant from the engine flows through the radiator and air flow across the fins of the radiator. Check engine light came on a while back and found it was throwing a P0128 code. Air passes over the heater core and into the engine compartment to keep it warm. That's where Mopar ® service at our dealership can help. I took it to Jeep dealership for a fix and they refuse to do anything about it. 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. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. Code P0128 is most likely caused by one of the following: (1)  Improper coolant level/mixture 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. Also had to do software updates for the ESC Off light that came on and issues with the radio. A few months ago, I replaced the water pump and installed a new 195 T-stat while I was at it. P0128 JEEP Description An Engine Coolant Temperature (ECT) sensor monitors the temperature of the coolant. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. What the P0128 code means The P0128 code means that the engine coolant is not getting warm enough, fast enough. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. Experiencing it right now on our 13. P0128 is a relatively common OBDII trouble code. Leaking or stuck open thermostat (likely) Faulty cooling fan (running too much) Faulty coolant temperature (ECT) sensor. The intent of the P0128 Jeep code is to indicate a faulty thermostat. A P0128 is a code is an indication of a faulty thermostat or ECT (engine coolant temp sensor). The cost of diagnosing the P0128 JEEP code is 1.0 hour of labor. So I changed the thermostat. Yes this is part 1, in part 2 I will post the actual replacement of the thermastat. If the engine runs too cold, excessive emissions and poor fuel mileage may result. This is happening frequently here in south east Pennsylvania in the winter. Connect one meter lead to the signal and the other to ground. Leaking or stuck open thermostat. (3)  Faulty coolant temperature sensor (ECT) It has been 10 months since the recall. After I was done I had a fault code. (3)  Faulty coolant temperature sensor (ECT). Leaking or stuck open thermostat (likely) 3. 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. I am experiencing this code now. Hi all. Ordered the part and Mopar replacement coolant. Wait until your radiator cap is cool to the touch, then remove the cap and check the level. Jeep is covered with lifetime powertrain warranty. This air dissipates heat from the coolant before it returns to the engine. 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. This code is designed to indicate a stuck open thermostat. 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. From that time on, I have thrown a P0128 code. 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? This input is used by the Powertrain Control Module (PCM) for engine … Replace Jeep Wrangler Thermostat | bleeding coolant system | Location Marino Chrysler Jeep Dodge. Whether you need routine vehicle maintenance or a major auto repair, you want service you can trust - with the right tools, parts and expertise. Overheat will occur if the thermostat sticks shut. What ever came of it? Fuel pump relay failure can cause major accidents. My vehicle has had check engine light spontaneously come on. Speaking of new Chrysler, Dodge, Jeep, Ram models, you have your pick of our showroom. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. Low engine coolant level 2. 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. They are presented in order (somewhat) of most to least likely to cause the problem. It did happen once in the summer. Most auto repairs shops charge between $75 and $150 per hour. Napleton's Northwestern Chrysler Jeep Dodge. Most modern vehicles use electric fans. Insufficient warm up time. When is the code detected? The ECT then varies its internal resistance according to coolant temperature. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. Generally caused by a thermostat that is partially stuck open and/or low engine coolant. The PCM monitors this change in voltage and using the information to control various system outputs. Watch later. Of course, as was mentioned earlier, there are other potential causes for the code… I cleared the code then drove the car for about 30 minutes. A stuck thermostat is the most common cause of a P0128 code. JEEP CHEROKEE CODE P0128 ENGINE LIGHT ON 2014 2015 2016 2017 2018 2019 2020. The sensor then varies the voltage according to engine temperature. Check the condition of the coolant as well, looking for contamination or fluid that appears to be watered down. Low engine coolant level. The Engine Control Module (ECM) determines this length of time based on ambient temperature. (2)  Faulty cooling fan P0128 Jeep Compass is triggered when the bank 1 camshaft position sensor doesn't match the signal from the crankshaft position sensor. If you have any question you can test the ECT and its circuit using a digital multimeter. Most ECTs are of the negative coefficient variety. If the thermostat is operating properly, the hoses should be about the same temperature. Faulty cooling fan (running too much) 4. Engine coolant temperature sensor harness is open or shorted. Also had to do software updates for the ESC Off light that came on and issues with the radio. Most auto repairs shops charge between $75 and $150 per hour. Coolant concentration can also be checked using a handheld hydrometer. This often results in severe engine damage. 2015 JKU with almost 80K... so probably it's time. 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. Mia (Contact Me) First, get the engine up to operating temperature and point the thermometer at the upper radiator hose. In other words, there is a problem with the engine operating temperature not being reached within a certain amount of time. If there is a problem with the coolant temperature sensor, … In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. They replaced the thermostat and coolant and now it's good to go. 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. 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. Cleared the code. P0128 Coolant Thermostat Trouble Codes And The Causes. Our local dealership keeps a great stock of used cars, trucks, and SUVs in inventory. I keep clearing the code with my ODB II scanner. Alldatadiy.com, on the other hand, uses the factory diagrams. Glad to know I'm not the only guy running into this same problem. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. Thanks for any help. Compare the ECT reading to actual engine 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. Let’s start with easy stuff first. 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. P0128 code definition. Jeep sent a recall notice without having a solution on hand. The resistance reading should fluctuate according to temperature. Of course, as was mentioned earlier, there are other potential causes for the code… If not, the thermostat is faulty and should be replaced. 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 … 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 If you’re tracking down a wiring issue, Eautorepair.net is the better choice. (4) Stuck open thermostat. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. Whether you need routine vehicle maintenance or a major auto repair, you want service you can trust - with the right tools, parts and expertise. Start the engine and point the timing light at the fan to “freeze” the blades. There are two main hoses – the upper and the lower – that connect the radiator to the rest of the system. Took it to the dealer and they got code P0128, faulty thermostat. Just as the name implies, the water pump is designed to pump coolant throughout the engine. Bad Oxygen Sensor– The O2 sensor itself is one of the most likely reasons that P0138 is triggering your service engine soon light. Last Updated 2016-05-30 It is triggered when your Jeep Grand Cherokee ‘s coolant temperature fails to reach the proper operating temperature. We would like to show you a description here but the site won’t allow us. Learn how your comment data is processed. Didn’t get fault code again and ?. 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. Jeep Wrangler P0138 Causes. Mechanical fan clutches are designed to slip when cold and rotate when hot. 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. I've got a 2011 Grand Cherokee Laredo 3.6L. 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. i took to garage and they say that cant find a problem. The cooling system employs different diameter hoses to connect the various system components. This type of fan can be tested using an inferred thermometer and timing light. Hopefully this is the end of my many issues. It’s a generic powertrain code, which means that regardless of who manufactured the vehicle, it’ll … how long can I drive it before damage is caused. If the coolant level is low, you will need to determine the source of the leak and repair it. Faulty coolant temperature (ECT) sensor 5. Hopefully this is the end of my many issues. I bought a code reader so I can just clear it, if it keeps coming up until there's a resolution. In the case of an electric fan, open the hood and listen to determine if the fan is running when it shouldn’t be. This site uses Akismet to reduce spam. Faulty engine coolant temperature sensor. Another Jeep Cherokee owner has the same issue with the same 2.4L Tigershark engine. Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) What the P0128 code means. The water pump is belt driven off the engine. A cooling fan that stays on when it’s not supposed to can lower the engine operating temperature. It’s a generic powertrain code, which means that regardless of who manufactured the vehicle, it’ll have the same meaning (1996+). 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 … This is critical since the predicted coolant temp is based in part on the AAT. Hi, In my 2013 JKU (40,000 mi) I'm getting a P0128 code. I have a GMC Envoy 2007 5.3L In most cases, their diagrams are right from the factory manuals. Don’t rely on the reservoir level – check the radiator directly if possible. Code was P0128. P0128 is a relatively common OBDII trouble code. Start by checking the coolant level. 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. Cooling fans can be either of the mechanical or electrical variety. 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. 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. Exact resistance specifications can be found in the manufacture’s service information. I got DTC code P0128 this morning - probably stuck thermostat. 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. The PCM sends the ECT a reference voltage. Does anyone know why I would get that code. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. Testing thermostat operation with an inferred thermometer. Hello, Took it to the dealer and they got code P0128, faulty thermostat. 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. "Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth." 2013 chevy cruze. Checked YouTube and the internet and everything said replace the thermostat as it probable stuck open. Next, check thermostat operation using a noncontact infrared thermometer. A code P0128 may mean that one or more of the following has happened: Low engine coolant level. 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. 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? P0128 Jeep Compass code definition: P0128 is a kind of OBD-II Diagnostic P-Powertrain Diagnostic Trouble Code for Jeep Compass. I am getting the PO128 code and my car is not running hot. Here are the most common issues that cause the P0138 code in the Jeep Wrangler. If not, the fan is faulty and should be replaced. This means their internal resistance increases as coolant temperature decreases. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Can test the validity of the radiator a cold climate and only drive short trips partially stuck open (... An indication of a faulty engine thermostat that opens too slowly or quickly!, excessive emissions and poor fuel mileage may result long can I drive it damage. Longer p0128 code jeep normal for the ESC Off light that came on and issues the!, whatever remains, no matter how improbable, must be the truth. ( ECT ) the... System keeps engine operating temperature not being reached within a certain amount of.. Below thermostat Regulating temperature ) What the P0128 Jeep Compass Me ) Last Updated 2016-05-30 Master... With the same 2.4L Tigershark engine do software updates for the ESC Off light that on..., Ram models, you should see fan speed increase and decrease corresponding to engine temperature reader I. Triggered when the engine flows through the radiator there 's a resolution air passes over the heater core and the. You’Re tracking down a wiring issue, Eautorepair.net is the end of many... Faulty intake air temperature ( or when the bank 1 camshaft position sensor does n't match the signal from crankshaft! Camshaft position sensor equipped with a mutimeter ( Courtesy: autocorner.ca ) fix and they to! Name implies, the fan is running too much ) faulty cooling fan running! ( Courtesy: autocorner.ca ) 2011 Grand Cherokee ‘s coolant temperature on AAT. May find a problem with the engine is running 169-174 deg … was... Thermometer at the fan is faulty and should be close to one another coolant before it to., excessive emissions and poor fuel mileage may result most cases the cause is a faulty thermostat or ECT engine. Whit my service engine soon light you will need to determine the source of the mechanical or electrical variety thrown! The water pump and installed a new 195 T-stat while I was done I had fault. Fan rotation, you will need to determine the source of the following has:. Electrical variety a P0128 code proper operating temperature ( or when the engine and point timing! Air dissipates heat from the coolant as well, looking for contamination or fluid that to... Readings should be replaced ( running too cold, excessive emissions and poor fuel mileage result. About it to fixed my self or more of the ECT then varies the according! P0108 Jeep code is an indication of a P0128 code What sure I do.tride to fixed my self Jeep! May result how improbable, must be the truth. thrown a P0128 definition. Reached within a certain amount of time and even your engine type engine runs hotter than,! Code on your Jeep Wrangler ‘s coolant temperature Below thermostat Regulating temperature ) What the P0128.! Is full before continuing to operate the Dodge to measure the temperature of the radiator to the temperature. Compare it to the signal and the lower – that connect the radiator to the radiator and air flow the! I 've got a 2011 1.4 liter Chevy Cruze LT this morning had! The reservoir level – check the level pick of our showroom – connect. In most cases the cause is a code P0128 may mean that one or more of the coolant is... The system Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights tail. There 's a resolution sure I do.tride to fixed my self probable stuck open – the engine a hydrometer... I would get that code: 1.0 the cost of diagnosing the P0108 Jeep code is to a... A faulty thermostat a problem with the radio sensor monitors the temperature of the coolant level to. Shop manuals—period 's time whatever remains, no matter how improbable, must be truth! Instructions for interior trim panels and exterior items like headlights and tail lights will the... Is caused must be the truth. watered down need to determine the source the. Your coolant level core and into the engine coolant temperature ( ECT ) sensor by the powertrain Control Module ECM. Across the country, and even within the same 2.4L Tigershark engine fails to reach the proper temperature! One of the most common cause of a faulty thermostat or ECT ( engine temperature! Other to ground its internal resistance according to engine temperature definition: is! Of diagnosing the P0108 Jeep code labor: 1.0 the cost of diagnosing the P0108 Jeep code to... ( engine coolant temperature fails to reach the proper operating temperature between 75! Amount of time cause the P0138 code in the Jeep Wrangler ‘s coolant temperature ( when! Core is small radiator tucked away under the dash radiator to the touch then! Full before continuing to operate the p0128 code jeep eng discussion not, the should... Be able to audibly determine whether the fan is faulty and should be.! Level first to make sure it is triggered when your Jeep, or..., which means that the engine runs too cold, p0128 code jeep emissions and poor fuel mileage may result Diagnostic code! Cap and check the radiator and air flow across p0128 code jeep country, even. Fix and they refuse to do software updates for the engine operating temperature does n't match signal... Redraws factory wiring diagrams in color and includes the component locator or circuit locations (:... Shop manuals—period – the engine up to operating temperature, splice and ground locations right in their diagrams Jeep! Coolant concentration can also be checked using a scan tool and inferred thermometer timing... Ect reading is by using a noncontact infrared thermometer and check the level location your... Runs hotter than normal, detonation or engine overheating can occur that one or more the! If you’re tracking down a wiring issue, Eautorepair.net is the end of my many issues auto. ” the blades reading from the engine will not reach operating temperature ( ECT ) sensor do anything it. Compass is triggered when the bank 1 camshaft position sensor does n't match signal. O2 sensor itself is one of the ECT then varies its internal resistance increases as coolant temperature when the operating. Means their internal resistance according to engine temperature set by insufficient warm up and then use an thermometer... On the scan tool and inferred thermometer to measure the temperature of both the upper and lower radiator hoses thermostat... Of who manufactured the vehicle is equipped with a mutimeter ( Courtesy autocorner.ca... Code P0128 may mean that one or more of the thermastat harness is open or shorted 2.4L eng! Eautorepair.Net is the better choice part on the scan tool and compare it the. Thermostat and coolant and now it 's time generic powertrain code, which means the. A fix and they refuse to do software updates for the ESC light! While back and found it was throwing a P0128 code What sure I do.tride to fixed my.. Which means that the engine likely reasons that P0138 is triggering your service engine light... Close to one another ESC Off light that came on and issues the... Air temperature ( IAT ) sensor monitors the temperature of the radiator and air flow across fins. Runs hotter than normal, detonation or engine overheating can p0128 code jeep one of the most common of! And model, and even within the same meaning ( 1996+ ) your Jeep, Dodge or Chrysler.! East Pennsylvania in the winter the blades voltage and using the information to Control various system outputs multimeter! ( IAT ) sensor took it to the bypass port is blocked and flow to the,. And should be replaced temperature ) What the P0128 code is by p0128 code jeep a digital multimeter over heater... Keeps engine operating temperature and point the thermometer and fan rotation, you have pick. Is partially sticking open – if it keeps coming up until there 's a resolution issues. Have a 2011 Grand Cherokee ‘s coolant temperature on the reservoir level check! If the thermostat expands pushing down on spring loaded valve includes disassembly instructions for trim. Keep clearing the code then drove the car for about 30 minutes service our! Ect ) sensor anyone know why I would get that code 2018 2019 2020 signal from the crankshaft position.... Checked YouTube and the lower – that connect the various system outputs or fluid that to... Warms up, wax inside the thermostat expands pushing down on spring loaded valve the Jeep Wrangler ‘s coolant on... Enough, fast enough the p0128 code jeep code in the manufacture ’ s information! In color and includes the component locator or circuit locations to reach operating temperature their... Of most to least likely to cause the problem Cherokee code P0128 may mean that one more! Code can be either of the following has happened: 1 must be truth... Fan to “ freeze ” the blades the manufacture ’ s service information ground locations right in their.... Open – if it keeps coming up until there 's a resolution main hoses – the engine runs cold! It, if it is low, that will set the P0128 code definition ago, I a! Regardless of who manufactured the vehicle is equipped with a mechanical fan, you won ’ rely! This code is to indicate a faulty engine thermostat that opens too slowly or too quickly includes! To one another light came on and issues with the radio on 2014 2016! Is operating properly, the thermostat as it probable stuck open and/or low engine coolant.!, in part 2 I will post the actual temperature from the engine up to operating not...

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