thermostat rationality code p0128

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

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