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