Jeep is covered with lifetime powertrain warranty. If not, the thermostat is faulty and should be replaced. Faulty engine coolant temperature sensor. 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 … (4) Stuck open thermostat. (3)  Faulty coolant temperature sensor (ECT) However, after four minutes driving it’s become to the normal and everything perfect Yes this is part 1, in part 2 I will post the actual replacement of the thermastat. Speaking of new Chrysler, Dodge, Jeep, Ram models, you have your pick of our showroom. 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. In other words, there is a problem with the engine operating temperature not being reached within a certain amount of time. P0128 is a relatively common OBDII trouble code. 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. I got DTC code P0128 this morning - probably stuck thermostat. P0128 sets when it takes longer than normal for the engine to reach operating temperature. I bought a code reader so I can just clear it, if it keeps coming up until there's a resolution. This code is designed to indicate a stuck open thermostat. how long can I drive it before damage is caused. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. Here are the most common issues that cause the P0138 code in the Jeep Wrangler. P0004. Hi all. The cooling system employs different diameter hoses to connect the various system components. "Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth." A few months ago, I replaced the water pump and installed a new 195 T-stat while I was at it. 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. (3)  Faulty coolant temperature sensor (ECT). Hopefully this is the end of my many issues. A few months ago, I replaced the water pump and installed a new 195 T-stat while I was at it. Also had to do software updates for the ESC Off light that came on and issues with the radio. Check your coolant level first to make sure it is full before continuing to operate the Dodge. A code P0128 may mean that one or more of the following has happened: Low engine coolant level. They include wiring diagrams and technical service bulletins. Leaking or stuck open thermostat. Start the engine and point the timing light at the fan to “freeze” the blades. P0128 code definition. Air passes over the heater core and into the engine compartment to keep it warm. 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. Glad to know I'm not the only guy running into this same problem. P0128 JEEP Description An Engine Coolant Temperature (ECT) sensor monitors the temperature of the 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. Hopefully this is the end of my many issues. This is critical since the predicted coolant temp is based in part on the AAT. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. 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. They replaced the thermostat and coolant and now it's good to go. 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. Checked YouTube and the internet and everything said replace the thermostat as it probable stuck open. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. Checked anyway and no codes were present. Faulty coolant temperature (ECT) sensor 5. Faulty intake air temperature (IAT) sensor Looking at the thermometer and fan rotation, you should see fan speed increase and decrease corresponding to engine temperature. Faulty cooling fan (running too much) 4. 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. Low engine coolant level. Of course, as was mentioned earlier, there are other potential causes for the code… So I changed the thermostat. My vehicle has had check engine light spontaneously come on. First, get the engine up to operating temperature and point the thermometer at the upper radiator hose. Allow the engine to warm up and then use an inferred thermometer to measure the temperature of both the upper and lower radiator hoses. Set the meter to read ohms. 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. 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. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. 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 … From that time on, I have thrown a P0128 code. In other words the engine is running too cold – or at least the PCM thinks it is. This causes the valve to open; flow to the bypass port is blocked and flow to the radiator is enabled. It’s a generic powertrain code, which means that regardless of who manufactured the vehicle, it’ll have the same meaning (1996+). Code P0128 is most likely caused by one of the following: (1)  Improper coolant level/mixture If there is a problem with the coolant temperature sensor, … The PCM sends the ECT a reference voltage. Generally caused by a thermostat that is partially stuck open and/or low engine coolant. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. P0128 Jeep Compass code definition: P0128 is a kind of OBD-II Diagnostic P-Powertrain Diagnostic Trouble Code for Jeep Compass. It did happen once in the summer. The sensor then varies the voltage according to engine temperature. The temp is running 169-174 deg … P0128 JEEP Meaning Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified … The intent of the P0128 Jeep code is to indicate a faulty thermostat. Insufficient warm up time. They are presented in order (somewhat) of most to least likely to cause the problem. After I was done I had a fault code. Fuel pump relay failure can cause major accidents. I have a 2011 1.4 liter Chevy Cruze LT this morning I had a fault code P0128. For example, P0125 can be set if you live in a cold climate and only drive short trips. Another Jeep Cherokee owner has the same issue with the same 2.4L Tigershark engine. Cooling fans can be either of the mechanical or electrical variety. Compare the ECT reading to actual engine temperature. Hi, In my 2013 JKU (40,000 mi) I'm getting a P0128 code. Alldatadiy.com, on the other hand, uses the factory diagrams. Napleton's Northwestern Chrysler Jeep Dodge. Check engine light came on a while back and found it was throwing a P0128 code. This type of fan can be tested using an inferred thermometer and timing light. The resistance reading should fluctuate according to temperature. If you have any question you can test the ECT and its circuit using a digital multimeter. If the thermostat is operating properly, the hoses should be about the same temperature. This site uses Akismet to reduce spam. If not, the fan is faulty and should be replaced. From that time on, I have thrown a P0128 code. I keep clearing the code with my ODB II scanner. A stuck thermostat is the most common cause of a P0128 code. 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. They replaced the thermostat and coolant and now it's good to go. Wait until your radiator cap is cool to the touch, then remove the cap and check the level. Took it to the dealer and they got code P0128, faulty thermostat. A cooling fan that stays on when it’s not supposed to can lower the engine operating temperature. In most cases, their diagrams are right from the factory manuals. There are two main hoses – the upper and the lower – that connect the radiator to the rest of the system. This input is used by the Powertrain Control Module (PCM) for engine … It is triggered when your Jeep Grand Cherokee ‘s coolant temperature fails to reach the proper operating temperature. If it is low, that will set the P0128 code. - Sherlock Holmes, By When the engine slightly exceeds the operating temperature (or when the A/C is switched on) the fans engage. Replace Jeep Wrangler Thermostat | bleeding coolant system | Location The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. 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. Low engine coolant level 2. Our local dealership keeps a great stock of used cars, trucks, and SUVs in inventory. This often results in severe engine damage. I am experiencing this code now. 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. What the P0128 code means The P0128 code means that the engine coolant is not getting warm enough, fast enough. Faulty intake air temperature (IAT) sensor. 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' A P0128 is a code is an indication of a faulty thermostat or ECT (engine coolant temp sensor). 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. Most auto repairs shops charge between $75 and $150 per hour. Fortunately, the thermostat is easy to test. Watch later. The cooling system keeps engine operating temperature in a specified range. I took it to Jeep dealership for a fix and they refuse to do anything about it. The Engine Control Module (ECM) determines this length of time based on ambient temperature. The description for code P0128 is “coolant thermostat (coolant temperature below thermostat regulating temperature).” This code is set when the PCM notices that the engine has not reached operating temperature within the specified time. 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. The ECT then varies its internal resistance according to coolant temperature. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. 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. These two readings should be close to one another. The description for code P0128 is “coolant thermostat (coolant temperature below thermostat regulating temperature).” This code is set when the PCM notices that the engine has not reached operating temperature within the specified time. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Bad Oxygen Sensor– The O2 sensor itself is one of the most likely reasons that P0138 is triggering your service engine soon light. 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 sent a recall notice without having a solution on hand. 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. 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. 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 In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. Least the PCM sends the ECT reading is by using a noncontact infrared thermometer RATIONALITY trouble code for Compass... 150 per hour temp is based in part on the other hand uses. Lt this morning I had a fault code that code and repair it you won ’ t get code... 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