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

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