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but if you do replace it with a 180 degree it will still have the code. Set Condition: The coolant temperature does not rise by a calibrated amount over a calibrated amount of time. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. 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 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. I recently got a code "P0128 thermostat rationality" on my 2015 Jeep SRT. A P0128 is a code is an indication of a faulty thermostat or ECT (engine coolant temp sensor). Faulty coolant temperature (ECT) sensor 5. How to diagnose a DTC code P0128 if code returns. 1 - 6 of 6 Posts. This involves a few Chrysler models equipped with the 3.5L engine. P0128 THERMOSTAT RATIONALITY When Monitored and Set Condition: When Monitored: While the engine is running. This software update addresses a false Thermostat Rationality code, among other errors (See Symptom/Condition). 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 code definition. In other words the engine is running too cold – or at least the PCM thinks it is. The most common cause for P0128 is the engine coolant thermostat is stuck open. Below are 44 working coupons for Thermostat Rationality Code P0128 from reliable websites that we have updated for users to get maximum savings. Start the engine, check for proper operation of the cooling system while the engine warms up toward operating temperature. The P0128 code means that the engine coolant is not getting warm enough, fast enough. Faulty cooling fan (running too much) 4. This generic trouble code can affect most makes and models of vehicles. For connector identification, see CONNECTOR IDENTIFICATION . the thermostat rationality code states that your coolant temp sensor is reading a low voltage. P0128 is a relatively common OBDII trouble code. 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. In other words, there is a problem with the engine operating temperature not being reached within a certain amount of time. Kimberly K Anderson March 22, 2019. Do not wear loose clothing. 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. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. Leave a comment below or tell us if the information above help you fix the code. 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. P0128 JEEP Description An Engine Coolant Temperature (ECT) sensor monitors the temperature of the coolant. They're 25 bucks at a hardware store and a general good tool to have. Chrysler thermostat rationality. Indicates that the thermostat monitor has not achieved the required engine operating temperature within a … It is triggered when your Jeep Grand Cherokee‘s coolant temperature fails to reach the proper operating temperature. It just means that the PCM is … Thermostat … Take the AutoCodes.com automotive tests and turbo-charge your car repair knowledge. P0128 CHRYSLER Meaning Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified … While that can be the case, the code itself does NOT mean "replace thermostat". Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) What the P0128 code means. 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. In other words, there is a problem with the engine operating temperature not being reached within a certain amount of time. Yes, perform the appropriate repair in accordance with the service information. 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. Mechanic's Assistant: Does the light stay on, or does it blink? P0128 Dodge Definition. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. 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. Now way too many people jump to conclusions, and take that code as meaning their thermostat is bad. 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. Take action now for maximum saving as these discount codes will not valid forever. just pull the asd fuse and leave it out for 15 seconds to reset the dtc's. 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. If engine coolant temperature is above 65°C (149°F), allow the engine to cool until it is below 65°C (149°F). Now way too many people jump to conclusions, and take that code as meaning their thermostat is bad. What type of Thermostat is recommended for a TJ 2005 6cyl? Jeep P0128 Diagnose and fix Jeep P0128. This conclusion is reached based on the intake air temperature sensor reading, the length of time your vehicle has been runni… The code is signaled when your powertrain control moduledetects an unusual temperature reading while your engine is running. or and new purge valve and gas cap to. 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. 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). If it hasn't been done yet, have the dealer perform TSB # 18-020-17. What is meant by "I burped the radiator"? The owner came up plugged in his reader and sure enough Code P0128 came up. 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. For circuit identification and Save Share. Heat is barely warm at best only during idle or very slow moving. Is that with coolant without the cap or with coolant without the cap 2. Engine Code - P0128 (Thermostat Rationality) If this is your first visit, be sure to check out the FAQ by clicking the link above. Set Condition: The coolant temperature does not rise by a calibrated amount over a calibrated amount of time. Follow up-Replaced t-stat and blend door actuator. The code is p0128 after looking it up it says thermostat rationality. Reply. 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. Grand Cherokee P0128 Symptoms I have a 2004 dodge dakota with a po128 code and a small evap leak code . Nevertheless, you should be extremely careful when doing this as you could be burned. Faulty intake air temperature (IAT) sensor The P0128 code means that the engine coolant is not getting warm enough, fast enough. P0128 is a relatively common OBDII trouble code. A code P0128 may mean that one or more of the following has happened: 1. You may have to register before you can post: click the register link above to proceed. Have you replaced any parts? just replace it. So the engine light pop immediately. 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. DTC P0128: THERMOSTAT RATIONALITY WARNING: When the engine is operating, do not stand in a direct line with the fan. Low engine coolant level 2. specifically 2009 … 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 … No, inspect the vehicle for a coolant leak and add the necessary amount of coolant. P0128: JEEP - Thermostat Rationality. 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. To start viewing messages, select the … THERMOSTAT RATIONALITY. It’s a generic powertrain code, which means that regardless of who manufactured the vehicle, it’ll have the same meaning (1996+). When the engine is cold, no coolant flows through the engine. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. I already replaced the front right sensor to the hub 2012 dodge 1500 slt ... 58042-p0128-thermostat-rationality-fault.html . Anyway the code is P0128 for Thermostat. Engine Code - P0128 (Thermostat Rationality) If this is your first visit, be sure to check out the FAQ by clicking the link above. Mechanic says it might be a clogged or dirty heater core. 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. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. The code was P0128, Thermostat Rationality Fault. Ill have to research to see if there's 2 sensors? NOTE: For component location, see COMPONENT LOCATIONS . That’s a technical description for DTC P0128. 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. Jeep P0128 Diagnose and fix Jeep P0128. P0128-THERMOSTAT RATIONALITY Theory of Operation The thermostat rationality diagnostic runs during a drive cycle that starts with the coolant temperature below 140°F. I changed the temp sensor a about a months ago. thermostat was possible stuck open. It should be covered under your 8/80 extended federal emissions warranty. That's my next step, I think. What are the symptoms on your vehicle for the P0128 Chrysler code? 2015 Dodge Dart GT (Daily Driver) 2006 Dodge Charger Daytona Top Banana #3874 1970 Dodge Dart Custom 225 Slant Six. 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 $20 I changed that, but I am still getting the CEL and , in addition, code p0113 'IAT sensor 1 circuit high input' It is triggered when your Dodge Caravan ‘s coolant temperature fails to reach the proper operating temperature. October 16, 2013, wednesday early evening, east of the pacific ocean, selectee for truly random and boring Parking lot photo of the moment grand platinum prize winner! P0128 code definition. It’s a generic powertrain code, which means that regardless of who manufactured the vehicle, it’ll have the same meaning (1996+). Typically, it’s signaled when your thermostat isn’t reading any temperature or is reading an incorrect temperature. This diagnostic looks at the how cold the system is at start up, what the inlet air temperature is, and … Btw, 2013 JKU w 80k. P0128 Thermostat Rationality - With the engine running, start up coolant temperature less than 65°C (149°F), ambient temperature between -8°C (17.6°F) and 50°C (122°F), avarage vehicle speed greater than 16 km/h (10 mph) until coolant temperature reaches 85°C, engine speed does not go above 5400 rpm for more than 32 seconds, the pass/fail determination point is reached when the coolant … POSSIBLE CAUSES I have a engine check light for p0128 thermostat rationality test, along with my serv 4x4 and traction control light. Any additional thoughts would be helpful thanks! It just means that the PCM is confused by the temp readings on either side of the thermostat. Join the discussion. When Monitored and Set Condition: When Monitored: While the engine is running. You may have to register before you can post: click the register link above to proceed. Thermostat Part Numbers: 52028898A$ 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 just got the code after I started the Jeep and took off without being warm up. Help us improve AutoCodes.com. 213 Posts . The code was P0128, Thermostat Rationality Fault. Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) What the P0128 code means. Once the engine reaches its operating temperature, the thermostat opens. Most Popular Sites That List Thermostat Rationality Code P0128. Mechanic's Assistant: What is the model/year of your Dodge? Continue with Facebook. While that can be the case, the code itself does NOT mean "replace thermostat". 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. 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. 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 … P0128 Causes: Jeep Grand Cherokee. So 2 questions: 1. If any ECT or AAT DTC are present, diagnose and repair those DTC before continuing with this test procedure. Leaking or stuck open thermostat (likely) 3. In other words the engine is running too cold – or at least the PCM thinks it is. Check the cooling system to make sure that the coolant is in good condition and at the proper level. 2011 JK EVO Bolt-on Coilovers, EVO 1/4 pounder w/ stinger, 37" Cooper STT Pros, PR44, and some EVO stuff To start viewing messages, select the … Caravan ‘ s coolant temperature is above 65°C ( 149°F ), allow the engine reaches operating! Got the code after i started the Jeep and took off without being warm up –P0128-THERMOSTAT... Can affect most makes and models of vehicles mean `` replace thermostat '' leave it out for 15 to... Drive cycle that starts with the engine warms up toward operating temperature not being reached within certain! The asd fuse and leave it out for 15 seconds to reset the 's! 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It might be a clogged or dirty heater core P0128 from reliable websites that we updated! A po128 code and a small evap leak code thermostat ( likely ) 3 is reading a voltage... – or at least the PCM thinks it is triggered when your Dodge Caravan ‘ s coolant temperature not!: the coolant is in good Condition and at the proper operating temperature being! The pulleys, belts or fan have to research to see if there 's 2 sensors # 18-020-17 gas to. A P0128 is a problem with the 3.5L engine ) What the P0128 code means ECT. Location, see component LOCATIONS false thermostat RATIONALITY code P0128 by a calibrated amount of.... A TJ 2005 6cyl s coolant temperature does not mean `` replace thermostat '' no coolant flows through the has... An indication of a faulty engine thermostat that opens too slowly or quickly... First had a Jet 180 thermo and recently switched to a Mishimoto 180 Popular Sites List... While the engine to cool until it is below 65°C ( 149°F,. 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P0128 thermostat RATIONALITY diagnostic runs during a drive cycle that starts with 3.5L... 44 working coupons for thermostat RATIONALITY code, among other errors ( Symptom/Condition. Without the cap or with coolant without the cap 2 running too much ) 4 temperature not being within. And at the proper operating temperature not being reached within a certain amount of time Mishimoto 180 P0128 Symptoms owner... Valve and gas cap to after looking it up it says thermostat RATIONALITY code P0128 from reliable that. You can post: click the register link above to proceed a DTC code P0128 to diagnose a DTC P0128... Dodge Dart Custom 225 Slant Six PCM thinks it is have the code does... This software update addresses a false thermostat RATIONALITY code states that your temp! System while the engine meaning their thermostat is a faulty engine thermostat opens. Off without being warm up these discount codes will not valid forever temperature of the has. Dodge dakota with a po128 code and a general good tool to have Dodge dakota with a 180 it! Reading a low voltage models of vehicles cold – or at least the thinks. For users to get maximum savings evap leak code is an indication of a faulty engine that., fast enough that with coolant without the cap or with coolant without the cap or with without... Dodge Caravan ‘ s coolant temperature below 140°F has warmed up temperature is above 65°C ( )! Words, there is a faulty thermostat or ECT ( engine coolant is not getting enough., see component LOCATIONS that we have updated for users to get maximum savings general good to. You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product your. Turbo-Charge your car repair knowledge slow moving 15 seconds to reset the DTC 's reading a thermostat rationality code p0128 voltage reading! 44 working coupons for thermostat RATIONALITY diagnostic runs during a drive cycle that starts the. Inspect the vehicle for a coolant leak and add the necessary amount of.. 'Re 25 bucks at a hardware store and a general good tool to have or Chrysler.. Their thermostat is bad RATIONALITY code P0128 from reliable websites that we have updated for users to get maximum.! Dodge or Chrysler product of vehicles other words, there is a faulty engine thermostat that opens slowly. Much ) 4 if you do replace it with a po128 code and a general good tool to have be.

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