Heat is barely warm at best only during idle or very slow moving. 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. Faulty coolant temperature (ECT) sensor 5. What type of Thermostat is recommended for a TJ 2005 6cyl? 213 Posts . This diagnostic looks at the how cold the system is at start up, what the inlet air temperature is, and … P0128: JEEP - Thermostat Rationality. What are the symptoms on your vehicle for the P0128 Chrysler code? Yes, perform the appropriate repair in accordance with the service information. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. If the tstat is stuck open, it's not going to hurt your motor, HOWEVER, your fuel injection system is designed to run based on the ECT input, so it could affect mpg and engine performance if the PCM isn't getting an ideal reading from the ECT sensor. The code is p0128 after looking it up it says thermostat rationality. So the engine light pop immediately. For connector identification, see CONNECTOR IDENTIFICATION . I just got the code after I started the Jeep and took off without being warm up. It just means that the PCM is confused by the temp readings on either side of the thermostat. Chrysler thermostat rationality. Btw, 2013 JKU w 80k. Have you replaced any parts? Reply. Thermostat … but if you do replace it with a 180 degree it will still have the code. A simple way to diagnose this is to feel the radiator hose and monitor how hot the temperature of the coolant is when it starts flowing through the radiator hose. When Monitored and Set Condition: When Monitored: While the engine is running. 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 have to register before you can post: click the register link above to proceed. Anyway the code is P0128 for Thermostat. I have a engine check light for p0128 thermostat rationality test, along with my serv 4x4 and traction control light. The engine light is constant, the serv 4x4 and traction control comes off and on. P0128 JEEP Description An Engine Coolant Temperature (ECT) sensor monitors the temperature of the coolant. the thermostat rationality code states that your coolant temp sensor is reading a low voltage. P0128 CHRYSLER Description Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine. I recently got a code "P0128 thermostat rationality" on my 2015 Jeep SRT. P0128 is a relatively common OBDII trouble code. How to diagnose a DTC code P0128 if code returns. Be certain to check the Radiator cap, flow through the Radiator and anything that can cause a lack of system pressure or lack of coolant flow in the system. I have bought a thermostat , radiator, sensor, electric fan , hoses , flushed it and new fluid and still po128 code and small evap leak code . P0128 Thermostat Rationality - With the engine running, start up coolant temperature less than 65°C (149°F), ambient temperature between -8°C (17.6°F) and 50°C (122°F), avarage vehicle speed greater than 16 km/h (10 mph) until coolant temperature reaches 85°C, engine speed does not go above 5400 rpm for more than 32 seconds, the pass/fail determination point is reached when the coolant … NOTE: For component location, see COMPONENT LOCATIONS . P0128-THERMOSTAT RATIONALITY Theory of Operation The thermostat rationality diagnostic runs during a drive cycle that starts with the coolant temperature below 140°F. They're 25 bucks at a hardware store and a general good tool to have. DTC P0128: THERMOSTAT RATIONALITY WARNING: When the engine is operating, do not stand in a direct line with the fan. Thermostat Part Numbers: 52028898A$ Issue Description: We have noted an increase in returned thermostats for rationality fault codes (examples: P0116, P0128, P1281, or P2181) that are aftermarket (non OEM) performance thermostats rated at lower temperatures than recommended by Chrysler Engineering, especially on the 6.1L SRT Hemi. Start the engine, check for proper operation of the cooling system while the engine warms up toward operating temperature. Engine Code - P0128 (Thermostat Rationality) If this is your first visit, be sure to check out the FAQ by clicking the link above. This involves a few Chrysler models equipped with the 3.5L engine. Do not wear loose clothing. A P0128 is a code is an indication of a faulty thermostat or ECT (engine coolant temp sensor). Engine Code - P0128 (Thermostat Rationality) If this is your first visit, be sure to check out the FAQ by clicking the link above. October 16, 2013, wednesday early evening, east of the pacific ocean, selectee for truly random and boring Parking lot photo of the moment grand platinum prize winner! When the engine is cold, no coolant flows through the engine. Continue with Facebook. It just means that the PCM is … P0128 JEEP Meaning Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine. I first had a Jet 180 thermo and recently switched to a Mishimoto 180. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. Take action now for maximum saving as these discount codes will not valid forever. Diagnose code P0128 Thermostat Rationality, P06DD Engine Oil Pressure control circuit stuck off, P06DA Engine Oil Pressure control circuit, P06DE Engine Oil Pressure Control Circuit Stuck On, C2116 JEEP, DODGE, CHRYSLER ABS Pump Supply Low Voltage, U0151-Lost Communication with Occupant Restraint Controller (ORC), C123F-Steering Angle Sensor comparative performance. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. Here are the most common causes of P0128: Thermostat Stuck Open– Far and away, the most typical cause for the P0128 code is going to be a thermostat that is stuck open. While that can be the case, the code itself does NOT mean "replace thermostat". Grand Cherokee P0128 Symptoms 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 fuel … It is triggered when your Jeep Grand Cherokee‘s coolant temperature fails to reach the proper operating temperature. Posted and Edit by AutoCodes.com 05-30-2020, 5 Most Common Reasons for Check Engine Light, Engine coolant temperature sensor harness is open or shorted, Engine coolant temperature sensor circuit poor electrical connection, Engine Light ON (or Service Engine Soon Warning Light). The most common cause for P0128 is the engine coolant thermostat is stuck open. 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' Ill have to research to see if there's 2 sensors? P0128 code definition. The code is signaled when your powertrain control moduledetects an unusual temperature reading while your engine is running. 2015 Dodge Dart GT (Daily Driver) 2006 Dodge Charger Daytona Top Banana #3874 1970 Dodge Dart Custom 225 Slant Six. 1 - 6 of 6 Posts. Quick question here, I been looking but have found nothing so here goes...:D For the past couple weeks, I have had a P0128 code, car has ran fine without issue until yesterday, and I dont know if it's connected. 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