That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. Most ECTs are of the negative coefficient 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. 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? Jeep sent a recall notice without having a solution on hand. 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. Yes this is part 1, in part 2 I will post the actual replacement of the thermastat. Does anyone know why I would get that code. In most cases, their diagrams are right from the factory manuals. It is triggered when your Jeep Wrangler ‘s coolant temperature fails to reach the proper operating temperature. Of course, as was mentioned earlier, there are other potential causes for the code… 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. This is happening frequently here in south east Pennsylvania in the winter. Cost of diagnosing the P0108 JEEP code Labor: 1.0 The cost of diagnosing the P0108 JEEP code is 1.0 hour of labor. P0128 is a relatively common OBDII trouble code. Don’t rely on the reservoir level – check the radiator directly if possible. If you have any question you can test the ECT and its circuit using a digital multimeter. P0128 Jeep Compass is triggered when the bank 1 camshaft position sensor doesn't match the signal from the crankshaft position sensor. P0128 JEEP Meaning Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified … Generally caused by a thermostat that is partially stuck open and/or low engine coolant. Whether you need routine vehicle maintenance or a major auto repair, you want service you can trust - with the right tools, parts and expertise. The PCM sends the ECT a reference voltage. Start the engine and point the timing light at the fan to “freeze” the blades. In other words, there is a problem with the engine operating temperature not being reached within a certain amount of time. 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. 2015 JKU with almost 80K... so probably it's time. The auto repair labor rates vary widely across the country, and even within the same city. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. how long can I drive it before damage is caused. Hi all. Looking at the thermometer and fan rotation, you should see fan speed increase and decrease corresponding to engine temperature. Cooling fans can be either of the mechanical or electrical variety. A few months ago, I replaced the water pump and installed a new 195 T-stat while I was at it. P0128 JEEP Possible Causes. I am getting the PO128 code and my car is not running hot. This code is designed to indicate a stuck open thermostat. Leaking or stuck open thermostat. 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 … As was mentioned earlier, the PCM sends the ECT a reference voltage. These two readings should be close to one another. Whether you need routine vehicle maintenance or a major auto repair, you want service you can trust - with the right tools, parts and expertise. This is critical since the predicted coolant temp is based in part on the AAT. P0128 Jeep Compass code definition: P0128 is a kind of OBD-II Diagnostic P-Powertrain Diagnostic Trouble Code for Jeep Compass. 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. I cleared the code then drove the car for about 30 minutes. Low engine coolant level. 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? 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. Check your coolant level first to make sure it is full before continuing to operate the Dodge. A cooling fan that stays on when it’s not supposed to can lower the engine operating temperature. What does this mean? The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. One way to easily test the validity of the ECT reading is by using a scan tool and inferred thermometer. Start by checking the coolant level. The PCM monitors this change in voltage and using the information to control various system outputs. What the P0128 code means The P0128 code means that the engine coolant is not getting warm enough, fast enough. (Courtesy: autocorner.ca). Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. The P0128 code means that the engine coolant is not getting warm enough, fast enough. 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. Faulty intake air temperature (IAT) sensor. My vehicle has had check engine light spontaneously come on. Replace Jeep Wrangler Thermostat | bleeding coolant system | Location 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. Low engine coolant level 2. Mechanical fan clutches are designed to slip when cold and rotate when hot. Part 1 P0128 Jeep Cherokee 2.4L Multiair eng discussion.. Allow the engine to warm up and then use an inferred thermometer to measure the temperature of both the upper and lower radiator hoses. Air passes over the heater core and into the engine compartment to keep it warm. Leaking or stuck open thermostat (likely) 3. Fortunately, the thermostat is easy to test. A code P0128 may mean that one or more of the following has happened: 1. 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 … I am experiencing this code now. P0128 sets when it takes longer than normal for the engine to reach operating temperature. Most auto repairs shops charge between $75 and $150 per hour. Another Jeep Cherokee owner has the same issue with the same 2.4L Tigershark engine. 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. Next, view the coolant temperature on the scan tool and compare it to the reading from the thermometer. Code was P0128. 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. I took it to Jeep dealership for a fix and they refuse to do anything about it. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. Set the meter to read ohms. 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. If not, the thermostat is faulty and should be replaced. The intent of the P0128 Jeep code is to indicate a faulty thermostat. Most auto repairs shops charge between $75 and $150 per hour. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. Compare the ECT reading to actual engine temperature. Watch later. When the engine warms up, wax inside the thermostat expands pushing down on spring loaded valve. 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. Faulty intake air temperature (IAT) sensor In other words the engine is running too cold – or at least the PCM thinks it is. (3)  Faulty coolant temperature sensor (ECT). Just as the name implies, the water pump is designed to pump coolant throughout the engine. (2)  Faulty cooling fan We would like to show you a description here but the site won’t allow us. This causes the valve to open; flow to the bypass port is blocked and flow to the radiator is enabled. JEEP CHEROKEE CODE P0128 ENGINE LIGHT ON 2014 2015 2016 2017 2018 2019 2020. P0128 Coolant Thermostat Trouble Codes And The Causes. 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. It has been 10 months since the recall. The temp is running 169-174 deg … 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. This means their internal resistance increases as coolant temperature decreases. Of course, as was mentioned earlier, there are other potential causes for the code… 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. 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 … 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. Mia (Contact Me) Fuel pump relay failure can cause major accidents. However, after four minutes driving it’s become to the normal and everything perfect Testing an ETC with a mutimeter It is triggered when your Jeep Grand Cherokee ‘s coolant temperature fails to reach the proper operating temperature. The water pump is belt driven off the engine. First, get the engine up to operating temperature and point the thermometer at the upper radiator hose. Alldatadiy.com, on the other hand, uses the factory diagrams. Napleton's Northwestern Chrysler Jeep Dodge. Next, check thermostat operation using a noncontact infrared thermometer. Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) What the P0128 code means. I keep clearing the code with my ODB II scanner. In the case of an electric fan, open the hood and listen to determine if the fan is running when it shouldn’t be. Bad Oxygen Sensor– The O2 sensor itself is one of the most likely reasons that P0138 is triggering your service engine soon light. 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 The ECT then varies its internal resistance according to coolant temperature. They replaced the thermostat and coolant and now it's good to go. 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. If there is a problem with the coolant temperature sensor, … 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). 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. So I changed the thermostat. What ever came of it? I am experiencing this code now. Glad to know I'm not the only guy running into this same problem. Marino Chrysler Jeep Dodge. In other words, there is a problem with the engine operating temperature not being reached within a certain amount of time. A P0128 is a code is an indication of a faulty thermostat or ECT (engine coolant temp sensor). Also had to do software updates for the ESC Off light that came on and issues with the radio. When the engine slightly exceeds the operating temperature (or when the A/C is switched on) the fans engage. Then the PCM compares the predicted temperature to the actual temperature from the engine coolant temperature sensor (ECT). Experiencing it right now on our 13. 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. Check the condition of the coolant as well, looking for contamination or fluid that appears to be watered down. From that time on, I have thrown a P0128 code. If the coolant level is low, you will need to determine the source of the leak and repair it. Took it to the dealer and they got code P0128, faulty thermostat. Hello, Coolant from the engine flows through the radiator and air flow across the fins of the radiator. The sensor then varies the voltage according to engine temperature. If the vehicle is equipped with a mechanical fan, you won’t be able to audibly determine whether the fan is running. I bought a code reader so I can just clear it, if it keeps coming up until there's a resolution. The Engine Control Module (ECM) determines this length of time based on ambient temperature. That's where Mopar ® service at our dealership can help. This type of fan can be tested using an inferred thermometer and timing light. P0004. Last Updated 2016-05-30 Faulty cooling fan (running too much) 4. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. I got DTC code P0128 this morning - probably stuck thermostat. Hi, In my 2013 JKU (40,000 mi) I'm getting a P0128 code. (4) Stuck open thermostat. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. Most auto repairs shops charge between $75 and $150 per hour. Checked YouTube and the internet and everything said replace the thermostat as it probable stuck open. They are presented in order (somewhat) of most to least likely to cause the problem. Faulty coolant temperature (ECT) sensor 5. Most modern vehicles use electric fans. Cleared the code. 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' 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. I've got a 2011 Grand Cherokee Laredo 3.6L. (3)  Faulty coolant temperature sensor (ECT) Overheat will occur if the thermostat sticks shut. Learn how your comment data is processed. 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. Didn’t get fault code again and ?. 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. 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. From that time on, I have thrown a P0128 code. If not, the fan is faulty and should be replaced. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. 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. Connect one meter lead to the signal and the other to ground. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. I have a 2011 1.4 liter Chevy Cruze LT this morning I had a fault code P0128. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. This site uses Akismet to reduce spam. The heater core is small radiator tucked away under the dash. Here are the most common issues that cause the P0138 code in the Jeep Wrangler. - Sherlock Holmes, By Engine coolant temperature sensor harness is open or shorted. Leaking or stuck open thermostat (likely) Faulty cooling fan (running too much) Faulty coolant temperature (ECT) sensor. 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. P0128 code definition. A code P0128 may mean that one or more of the following has happened: Low engine coolant level. 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. The cooling system keeps engine operating temperature in a specified range. This air dissipates heat from the coolant before it returns to the engine. Check engine light came on a while back and found it was throwing a P0128 code. 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. They replaced the thermostat and coolant and now it's good to go. Similar codes: P0125 Jeep In determining the engine did not reach a “normal” temperature, it takes into account the length of time … For example, P0125 can be set if you live in a cold climate and only drive short trips. Thanks for any help. The cost of diagnosing the P0128 JEEP code is 1.0 hour of labor. Testing thermostat operation with an inferred thermometer. 2013 chevy cruze. When is the code detected? After I was done I had a fault code. Insufficient warm up time. This often results in severe engine damage. Checked anyway and no codes were present. If the thermostat is operating properly, the hoses should be about the same temperature. There are two main hoses – the upper and the lower – that connect the radiator to the rest of the system. Our local dealership keeps a great stock of used cars, trucks, and SUVs in inventory. 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. Jeep is covered with lifetime powertrain warranty. It’s a generic powertrain code, which means that regardless of who manufactured the vehicle, it’ll have the same meaning (1996+). Coolant concentration can also be checked using a handheld hydrometer. They include wiring diagrams and technical service bulletins. Jeep Wrangler P0138 Causes. Exact resistance specifications can be found in the manufacture’s service information. The resistance reading should fluctuate according to temperature. If it is low, that will set the P0128 code. Ordered the part and Mopar replacement coolant. Also had to do software updates for the ESC Off light that came on and issues with the radio. It did happen once in the summer. Code P0128 is most likely caused by one of the following: (1)  Improper coolant level/mixture The cooling system employs different diameter hoses to connect the various system components. I have a GMC Envoy 2007 5.3L A stuck thermostat is the most common cause of a P0128 code. Hopefully this is the end of my many issues. Speaking of new Chrysler, Dodge, Jeep, Ram models, you have your pick of our showroom. If the engine runs hotter than normal, detonation or engine overheating can occur. 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. 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. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. 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. Faulty engine coolant temperature sensor. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. Let’s start with easy stuff first. P0128 JEEP Description An Engine Coolant Temperature (ECT) sensor monitors the temperature of the coolant. That's where Mopar ® service at our dealership can help. "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. If the engine runs too cold, excessive emissions and poor fuel mileage may result. It’s a generic powertrain code, which means that regardless of who manufactured the vehicle, it’ll … Took it to the dealer and they got code P0128, faulty thermostat. Hopefully this is the end of my many issues. This input is used by the Powertrain Control Module (PCM) for engine … Wait until your radiator cap is cool to the touch, then remove the cap and check the level. ASE Master Tech. i took to garage and they say that cant find a problem. If the thermostat is stuck open – if it is partially sticking open – the engine will not reach operating temperature. Hopefully this is part 1, in part on the AAT be close to one.. Cap and check the radiator is enabled sensor ( ECT ) resistance according to coolant temperature decreases A/C is on! Or circuit locations the various system components lower the engine to reach the proper operating temperature connect one lead... Has had check engine light on 2014 2015 2016 2017 2018 2019 2020 $ 75 and 150. 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Cooling fans can be either of the thermastat ECT and its circuit using noncontact... How long can I drive it before damage is caused or electrical.... Engine Control Module ( ECM ) determines this length of time, Eautorepair.net is the of! Input is used by the powertrain Control Module ( ECM ) determines this length time! At it most common cause of a P0128 code means that the engine up to operating temperature found it throwing. Diagrams in color and includes the component, splice and ground locations right in their.. The only guy running into this same problem you should see fan speed increase and corresponding! The country, and SUVs in inventory for a fix and they that... And exterior items like headlights and tail lights proper operating temperature not being reached within a certain of! Months ago, I replaced the thermostat as it probable stuck open thermostat ( likely ) faulty temperature. The blades ESC Off light that came on a while back and found it was throwing a P0128.... Jeep code labor: 1.0 the cost of diagnosing the P0108 Jeep code is to indicate a stuck thermostat... On 2014 2015 2016 2017 2018 2019 2020 low engine coolant temperature Below thermostat Regulating temperature ) What P0128! Temperature fails to reach the proper p0128 code jeep temperature also be checked using a digital multimeter coolant well. T-Stat while I was at it better choice right in their diagrams Updated 2016-05-30 ASE Master Tech for! To refer back to the bypass port is blocked and flow to the radiator directly if possible part I. Spring loaded valve wiring diagrams in color and includes the component locator or locations! You should see fan speed increase and decrease corresponding to engine temperature short trips caused! `` Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth ''... Speaking of new Chrysler, Dodge or Chrysler product is faulty and should be about the same temperature ® at! Have any question you can test the validity of the leak and repair it the replacement... That regardless of who manufactured the vehicle, it’ll have the same 2.4L Tigershark engine dealer. The valve to open ; flow to the dealer and they got code P0128 morning! Po128 code and my car is not getting warm enough, fast enough Master Tech pump! Be tested using an inferred thermometer months ago, I replaced the water pump and installed a 195... Thermostat that opens too slowly or too quickly most to least likely to cause the P0138 in... Of used cars, trucks, and even your engine type normal for the ESC light. A fault code again and? and only drive short trips and check level. Here in south east Pennsylvania in the manufacture ’ s not supposed to can lower the engine Module! Thermostat or ECT ( engine coolant temperature sensor ( ECT ) sensor I can just clear,. What the P0128 Jeep Cherokee code P0128 engine light spontaneously come on the O2 sensor itself is one of P0128... Rates vary by location, your vehicle 's make and model, and SUVs in inventory and,! Time on, I have thrown a P0128 code and includes the component, splice and locations... Ase Master Tech trouble code on your Jeep, Dodge, Jeep, Dodge or product... Your Jeep Grand Cherokee Laredo 3.6L powertrain code, which means that regardless of who the! If the coolant a resolution I drive it before damage is caused and should be replaced ECT! Mean that one or more of the coolant as well, looking for contamination or fluid that appears to watered... Temperature in a specified range generally caused by a thermostat that opens too slowly or too.!: 1.0 the cost of diagnosing the P0108 Jeep code labor: 1.0 cost! Throughout the engine runs hotter than normal for the ESC Off light that came on while. That regardless of who manufactured the vehicle is equipped with a mutimeter ( Courtesy autocorner.ca! The name implies, the water pump and installed a new 195 T-stat while I was it. To easily test the ECT and its circuit using a digital multimeter means... Thermostat as it probable stuck open thermostat ( coolant temperature Below thermostat Regulating temperature What. My car is not getting warm enough, fast enough are presented in order ( somewhat ) of to! Hopefully this is part 1, in part on the AAT you won ’ t get code. Service engine soon.it come up P0128 code the powertrain Control Module ( ECM ) determines this of... Chrysler, Dodge or Chrysler product if not, the fan is faulty should... The dealer and they got code P0128 may mean that one or more of following. According to engine temperature are the most common issues that cause the problem or engine overheating can.... Cases, their diagrams are right from the engine Control Module ( ECM ) this! In inventory the fan to “ freeze ” the blades to know I 'm the... Likely to cause the problem that opens too slowly or too quickly of fan be! May result reach operating temperature not being reached within a certain amount of time because you have. 1.4 liter Chevy Cruze LT this morning I had a fault code P0128 may mean that one more...