Coolant from the engine flows through the radiator and air flow across the fins of the radiator. 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. We would like to show you a description here but the site won’t allow us. Yes this is part 1, in part 2 I will post the actual replacement of the thermastat. For example, P0125 can be set if you live in a cold climate and only drive short trips. The temp is running 169-174 deg … Set the meter to read ohms. Hi, In my 2013 JKU (40,000 mi) I'm getting a P0128 code. P0128 JEEP Description An Engine Coolant Temperature (ECT) sensor monitors the temperature of the coolant. Testing an ETC with a mutimeter Coolant concentration can also be checked using a handheld hydrometer. First, get the engine up to operating temperature and point the thermometer at the upper radiator hose. If the engine runs too cold, excessive emissions and poor fuel mileage may result. 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. Marino Chrysler Jeep Dodge. ASE Master Tech. 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. (Courtesy: autocorner.ca). The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour. 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. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. Cooling fans can be either of the mechanical or electrical variety. If there is a problem with the coolant temperature sensor, … 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. 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. Fortunately, the thermostat is easy to test. As was mentioned earlier, the PCM sends the ECT a reference voltage. I bought a code reader so I can just clear it, if it keeps coming up until there's a resolution. It is triggered when your Jeep Wrangler ‘s coolant temperature fails to reach the proper operating temperature. I am experiencing this code now. If the thermostat is stuck open – if it is partially sticking open – the engine will not reach operating temperature. Bad Oxygen Sensor– The O2 sensor itself is one of the most likely reasons that P0138 is triggering your service engine soon light. I cleared the code then drove the car for about 30 minutes. When the engine slightly exceeds the operating temperature (or when the A/C is switched on) the fans engage. If the coolant level is low, you will need to determine the source of the leak and repair it. Checked anyway and no codes were present. It has been 10 months since the recall. - Sherlock Holmes, By Check the condition of the coolant as well, looking for contamination or fluid that appears to be watered down. 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. Last Updated 2016-05-30 Leaking or stuck open thermostat (likely) 3. P0128 code definition. One way to easily test the validity of the ECT reading is by using a scan tool and inferred thermometer. 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. Looking at the thermometer and fan rotation, you should see fan speed increase and decrease corresponding to engine temperature. 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. Most auto repairs shops charge between $75 and $150 per hour. I have a GMC Envoy 2007 5.3L Ordered the part and Mopar replacement 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. 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. 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 … Of course, as was mentioned earlier, there are other potential causes for the code… 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). 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. Whether you need routine vehicle maintenance or a major auto repair, you want service you can trust - with the right tools, parts and expertise. This code is designed to indicate a stuck open thermostat. Faulty intake air temperature (IAT) sensor. These two readings should be close to one another. In other words, there is a problem with the engine operating temperature not being reached within a certain amount of time. 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. 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 saves a lot of time because you don’t have to refer back to the component locator or circuit locations. 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. 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? In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. Insufficient warm up time. Hi all. In the case of an electric fan, open the hood and listen to determine if the fan is running when it shouldn’t be. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. I've got a 2011 Grand Cherokee Laredo 3.6L. 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. The PCM monitors this change in voltage and using the information to control various system outputs. Engine coolant temperature sensor harness is open or shorted. A code P0128 may mean that one or more of the following has happened: 1. The intent of the P0128 Jeep code is to indicate a faulty thermostat. Does anyone know why I would get that code. I got DTC code P0128 this morning - probably stuck thermostat. Fuel pump relay failure can cause major accidents. Jeep Wrangler P0138 Causes. 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. 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