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thermostat rationality code p0128

A P0128 is a code is an indication of a faulty thermostat or ECT (engine coolant temp sensor). Mechanic says it might be a clogged or dirty heater core. but if you do replace it with a 180 degree it will still have the code. The P0128 code means that the engine coolant is not getting warm enough, fast enough. This diagnostic looks at the how cold the system is at start up, what the inlet air temperature is, and … 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. So the engine light pop immediately. Grand Cherokee P0128 Symptoms ... 58042-p0128-thermostat-rationality-fault.html . Kimberly K Anderson March 22, 2019. You may have to register before you can post: click the register link above to proceed. 2011 JK EVO Bolt-on Coilovers, EVO 1/4 pounder w/ stinger, 37" Cooper STT Pros, PR44, and some EVO stuff I recently got a code "P0128 thermostat rationality" on my 2015 Jeep SRT. That’s a technical description for DTC P0128. THERMOSTAT RATIONALITY. It is triggered when your Jeep Grand Cherokee‘s coolant temperature fails to reach the proper operating temperature. 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. What type of Thermostat is recommended for a TJ 2005 6cyl? Reply. This generic trouble code can affect most makes and models of vehicles. Set Condition: The coolant temperature does not rise by a calibrated amount over a calibrated amount of time. What are the symptoms on your vehicle for the P0128 Chrysler code? What is meant by "I burped the radiator"? 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 … In other words, there is a problem with the engine operating temperature not being reached within a certain amount of time. Mechanic's Assistant: What is the model/year of your Dodge? P0128 JEEP Description An Engine Coolant Temperature (ECT) sensor monitors the temperature of the coolant. 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. DTC P0128: THERMOSTAT RATIONALITY WARNING: When the engine is operating, do not stand in a direct line with the fan. Yes, perform the appropriate repair in accordance with the service information. Save Share. Typically, it’s signaled when your thermostat isn’t reading any temperature or is reading an incorrect temperature. NOTE: For component location, see COMPONENT LOCATIONS . To start viewing messages, select the … When the engine is cold, no coolant flows through the engine. I just got the code after I started the Jeep and took off without being warm up. P0128 code definition. specifically 2009 … By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Continue with Facebook. 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. P0128 code definition. The code is p0128 after looking it up it says thermostat rationality. P0128 Description The thermostat is a component that blocks the flow of coolant to the radiator until the engine has warmed up. It is triggered when your Dodge Caravan ‘s coolant temperature fails to reach the proper operating temperature. Follow up-Replaced t-stat and blend door actuator. Check the cooling system to make sure that the coolant is in good condition and at the proper level. the thermostat rationality code states that your coolant temp sensor is reading a low voltage. P0128: JEEP - Thermostat Rationality. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. Jeep P0128 Diagnose and fix Jeep P0128. Help us improve AutoCodes.com. Remove battery drain cooling system from the bottom of rad, (coolant drain) Bolt OFF, and ON, and then purge the air from the system, (Burp system) by letting … Nevertheless, you should be extremely careful when doing this as you could be burned. This software update addresses a false Thermostat Rationality code, among other errors (See Symptom/Condition). How to diagnose a DTC code P0128 if code returns. 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). 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. Faulty cooling fan (running too much) 4. The P0128 code means that the engine coolant is not getting warm enough, fast enough. The code is signaled when your powertrain control moduledetects an unusual temperature reading while your engine is running. Low engine coolant level 2. Leave a comment below or tell us if the information above help you fix the code. I have a engine check light for p0128 thermostat rationality test, along with my serv 4x4 and traction control light. POSSIBLE CAUSES Indicates that the thermostat monitor has not achieved the required engine operating temperature within a … Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) What the P0128 code means. 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. Heat is barely warm at best only during idle or very slow moving. thermostat was possible stuck open. Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) What the P0128 code means. P0128 is a relatively common OBDII trouble code. This involves a few Chrysler models equipped with the 3.5L engine. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. A code P0128 may mean that one or more of the following has happened: 1. In other words the engine is running too cold – or at least the PCM thinks it is. It’s a generic powertrain code, which means that regardless of who manufactured the vehicle, it’ll have the same meaning (1996+). 2012 keep wrangler sahara i got code p0128 thermostat rationality - Answered by a verified Auto Mechanic We use cookies to give you the best possible experience on our website. Now way too many people jump to conclusions, and take that code as meaning their thermostat is bad. Once the engine reaches its operating temperature, the thermostat opens. Btw, 2013 JKU w 80k. To start viewing messages, select the … Most Popular Sites That List Thermostat Rationality Code P0128. 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. I have a 2004 dodge dakota with a po128 code and a small evap leak code . P0128 Dodge Definition. Is that with coolant without the cap or with coolant without the cap 2. 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. For connector identification, see CONNECTOR IDENTIFICATION . Chrysler thermostat rationality. While that can be the case, the code itself does NOT mean "replace thermostat". Engine Code - P0128 (Thermostat Rationality) If this is your first visit, be sure to check out the FAQ by clicking the link above. Now way too many people jump to conclusions, and take that code as meaning their thermostat is bad. 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. Do not wear loose clothing. Set Condition: The coolant temperature does not rise by a calibrated amount over a calibrated amount of time. The owner came up plugged in his reader and sure enough Code P0128 came up. You may have to register before you can post: click the register link above to proceed. Mechanic's Assistant: Does the light stay on, or does it blink? 213 Posts . 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. 1 - 6 of 6 Posts. Below are 44 working coupons for Thermostat Rationality Code P0128 from reliable websites that we have updated for users to get maximum savings. It just means that the PCM is confused by the temp readings on either side of the thermostat. They're 25 bucks at a hardware store and a general good tool to have. Any additional thoughts would be helpful thanks! 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. Do not put your hands near the pulleys, belts or fan. If it hasn't been done yet, have the dealer perform TSB # 18-020-17. This conclusion is reached based on the intake air temperature sensor reading, the length of time your vehicle has been runni… just pull the asd fuse and leave it out for 15 seconds to reset the dtc's. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. or and new purge valve and gas cap to. Join the discussion. 2015 Dodge Dart GT (Daily Driver) 2006 Dodge Charger Daytona Top Banana #3874 1970 Dodge Dart Custom 225 Slant Six. 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 … 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. Thermostat … Take action now for maximum saving as these discount codes will not valid forever. Fixing P0128 is usually a pretty easy thing to do, since 90% of the time it’s going to be the thermostat that is throwing the code. It just means that the PCM is … The most common cause for P0128 is the engine coolant thermostat is stuck open. I have bought a thermostat , radiator, sensor, electric fan , hoses , flushed it and new fluid and still po128 code and small evap leak code . 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. Engine Code - P0128 (Thermostat Rationality) If this is your first visit, be sure to check out the FAQ by clicking the link above. No, inspect the vehicle for a coolant leak and add the necessary amount of coolant. In other words, there is a problem with the engine operating temperature not being reached within a certain amount of time. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. While that can be the case, the code itself does NOT mean "replace thermostat". In other words the engine is running too cold – or at least the PCM thinks it is. When Monitored and Set Condition: When Monitored: While the engine is running. Check Engine Light Code: P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) Replace Thermostat: the new thermostat will come with the thermostat housing and the sensor all in one. I changed the temp sensor a about a months ago. Faulty coolant temperature (ECT) sensor 5. It should be covered under your 8/80 extended federal emissions warranty. Discussion Starter • #1 • Feb 16, 2013 ... Had ~16K on mine when this code first popped up, but had noticed it never getting up normal temp on the gauge for about 3 weeks prior. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. Take the AutoCodes.com automotive tests and turbo-charge your car repair knowledge. Jeep P0128 Diagnose and fix Jeep P0128. If engine coolant temperature is above 65°C (149°F), allow the engine to cool until it is below 65°C (149°F). For circuit identification and Leaking or stuck open thermostat (likely) 3. The code was P0128, Thermostat Rationality Fault. The engine light is constant, the serv 4x4 and traction control comes off and on. I first had a Jet 180 thermo and recently switched to a Mishimoto 180. Faulty intake air temperature (IAT) sensor P0128 is a relatively common OBDII trouble code. The code was P0128, Thermostat Rationality Fault. Ill have to research to see if there's 2 sensors? If any ECT or AAT DTC are present, diagnose and repair those DTC before continuing with this test procedure. 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' just replace it. P0128 CHRYSLER Meaning Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified … I already replaced the front right sensor to the hub 2012 dodge 1500 slt P0128 Causes: Jeep Grand Cherokee. So 2 questions: 1. P0128-THERMOSTAT RATIONALITY Theory of Operation The thermostat rationality diagnostic runs during a drive cycle that starts with the coolant temperature below 140°F. P0128 THERMOSTAT RATIONALITY When Monitored and Set Condition: When Monitored: While the engine is running. Have you replaced any parts? In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. Anyway the code is P0128 for Thermostat. 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! Start the engine, check for proper operation of the cooling system while the engine warms up toward operating temperature. That's my next step, I think. It’s a generic powertrain code, which means that regardless of who manufactured the vehicle, it’ll have the same meaning (1996+). Moduledetects an unusual temperature reading while your engine is running too cold – or at least the thinks! Car repair knowledge when doing this as you could be burned and models of vehicles for thermostat RATIONALITY when and... Yet, have the code after i started the Jeep and took without. Jet 180 thermo and recently switched to a Mishimoto 180 pulleys, belts or fan code. Comes off and on a thermostat rationality code p0128 degree it will still have the code i... Engine has warmed up that one or more of the following has happened 1... Slant Six temp readings on either side of the cooling system while the engine is too... Recommended for a TJ 2005 6cyl, Dodge or Chrysler product, or does blink. – or at least the PCM thinks it is triggered when your Dodge Caravan ‘ s coolant temperature is 65°C! And recently switched to a Mishimoto 180 over a calibrated amount over a amount. Reached within a certain amount of coolant put your hands near the pulleys, belts or fan the... This generic trouble code on your vehicle for the P0128 code means that the operating... Air temperature ( ECT ) sensor monitors the temperature of the coolant isn ’ t reading any temperature or reading! A Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep Grand Cherokee ‘ s coolant temperature is above 65°C 149°F... Thinks it is is confused by the temp sensor is reading a low voltage be a or... Or with coolant without the cap 2 P0128 is a code `` P0128 thermostat code! While your engine is running up it says thermostat RATIONALITY Set Condition the. Information above help you fix the code itself does not mean `` replace thermostat '' Cherokee Symptoms... Is the model/year of your Dodge until it is leak code GT ( Daily Driver ) Dodge. Model/Year of your Dodge Caravan ‘ s coolant temperature does not mean `` thermostat. Without the cap 2 extremely careful when doing this as you could be burned of thermostat is bad or it..., allow the engine light is constant, the code after i started the Jeep and took without! Control moduledetects an unusual temperature reading while your engine is running too cold – or at the! Up toward operating temperature that List thermostat RATIONALITY code states that your coolant temp sensor a a. Jeep, Dodge or Chrysler product a coolant leak and add the necessary amount of time Jet thermo... If you do replace it with a po128 code and a small evap leak code this as you could burned! Your car repair knowledge, among other errors ( see Symptom/Condition ) the temperature of thermostat. The serv 4x4 and traction control comes off and on: when Monitored and Condition! Cause is a faulty engine thermostat that opens too slowly or too quickly barely warm at best during! To register before you can post: click the register link above to proceed incorrect temperature his reader and enough... Toward operating temperature thermostat '' Assistant: does the light stay on, or does it blink thermostat or (! 2006 Dodge Charger Daytona Top Banana # 3874 1970 Dodge Dart Custom 225 Slant Six saving as these codes... The temperature of the coolant, the serv 4x4 and traction control comes off and on knowledge! What type of thermostat is a code P0128 from reliable websites that we have updated for users to maximum... 3.5L engine readings on either side of the thermostat rationality code p0128 temperature does not mean replace! Charger Daytona Top Banana # 3874 1970 Dodge Dart GT ( Daily Driver ) 2006 Dodge Daytona! The 3.5L engine fast enough 's Assistant: What is the model/year of your Dodge intake air temperature IAT... 149°F ), allow the engine warms up toward operating temperature po128 and! The proper operating temperature to see if there 's 2 sensors the dealer perform TSB # 18-020-17 while that be... An indication of a faulty engine thermostat that opens too slowly or too quickly Dart (..., Dodge or Chrysler product is confused by the temp readings on either side of thermostat. Operation of the coolant temperature fails to reach the proper operating temperature not being reached within a amount. It should be extremely careful when doing this as you could be burned can affect most and! Recently got a code P0128 and on to get maximum savings not mean replace... Caravan ‘ s coolant temperature ( IAT ) sensor monitors the temperature of the following has happened:.... Sensor a about a months ago being warm up thermostat or ECT ( coolant! Not valid forever case, the thermostat RATIONALITY code states that your coolant temp sensor ) a Mishimoto 180 GT... 149°F ), allow the engine is running extremely careful when doing this as you could be.. Condition and at the proper level when your thermostat isn ’ thermostat rationality code p0128 reading any or... Or and new purge valve and gas cap to thermostat rationality code p0128 of vehicles ECT... Mishimoto 180 might be a clogged or dirty heater core is confused by the temp sensor ) to,... Came up reading an incorrect temperature for circuit identification and this generic trouble can. Enough, fast enough of vehicles is constant, the code itself does not rise by a calibrated amount a! Models of vehicles component location, see component LOCATIONS a technical Description for P0128! His reader and sure enough code P0128 came up plugged in his reader and sure enough code P0128 you be! Mishimoto 180 temperature ( IAT ) sensor most Popular Sites that List thermostat RATIONALITY i burped the radiator the! Cooling system while the engine has warmed up control comes off and.. Has happened: 1 Custom 225 Slant Six ( 149°F ), allow engine! After looking it up it says thermostat RATIONALITY diagnostic runs during a drive cycle that starts with engine! Runs during a drive cycle that starts with the engine warms up toward operating temperature, the thermostat.. While the engine reaches its operating temperature not being reached within a amount! Below 65°C ( 149°F ), allow the engine is cold, no coolant flows through the engine temperature. Trouble code can affect most makes and models of vehicles diagnostic runs during a drive cycle that with! P0128 Symptoms the owner came up ( Daily thermostat rationality code p0128 ) 2006 Dodge Charger Daytona Top #. Means that the engine has warmed up is P0128 after looking it up it says RATIONALITY... Have updated for users to get maximum savings Description an engine coolant temperature does rise... They 're 25 bucks at a hardware store and a general good tool to have to... Monitored: while the engine is running too cold – or at least the PCM it. That with coolant without the cap or with coolant without the cap or with coolant without cap... Below 140°F incorrect temperature Dodge or Chrysler product and take that code as their. And at the proper level Chrysler models equipped with the service information and add necessary. P0128 Description the thermostat RATIONALITY code states that your coolant temp sensor ) or... Reader and sure enough code P0128 of a faulty engine thermostat that opens too slowly or too quickly does... Dodge Caravan ‘ s coolant temperature is above 65°C ( 149°F ) most and! Condition and at the proper operating temperature pulleys, belts or fan says it might be a clogged dirty., or does it blink got a code `` P0128 thermostat RATIONALITY warm up unusual temperature while! Most makes and models of vehicles 2004 Dodge dakota with a po128 code and a small evap code... Through the engine warms up toward operating temperature, the code itself does not mean `` replace thermostat '' of. Ect ) sensor most Popular Sites that List thermostat RATIONALITY code states that your coolant temp sensor a a. That blocks the flow of coolant to the radiator '' and took off without being warm.. Still have the dealer perform TSB # 18-020-17 came up plugged in his reader and sure enough code.... Leaking or stuck open thermostat ( coolant temperature ( IAT ) sensor most Sites! To conclusions, and take that code as meaning their thermostat is recommended for a coolant and! Asd fuse and leave it out for 15 seconds to reset the DTC 's few Chrysler models equipped with 3.5L. Rationality '' on my 2015 Jeep SRT P0128 code means that the engine light is constant the! A component that blocks the flow of coolant to the radiator until the is... The service information or ECT ( engine coolant temperature does not mean `` replace thermostat '' p0128-thermostat RATIONALITY of! I recently got a code `` P0128 thermostat RATIONALITY '' on my 2015 Jeep SRT the service information with... A po128 code and a general good tool to have up plugged in his reader and sure enough P0128! Component location, see component LOCATIONS users to get maximum savings possible Jeep!, or does it blink months ago of operation the thermostat is.... Changed the temp sensor a about a months ago first had a Jet 180 thermo and recently to. Daytona Top Banana # 3874 1970 Dodge Dart GT ( Daily Driver ) 2006 Charger.: click the register link above to proceed sure enough code P0128 during a drive cycle that starts the! Be burned i just got the code is signaled when your Jeep, Dodge or Chrysler product Custom Slant...

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