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thermostat rationality code p0128

thermostat rationality code p0128

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

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