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

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