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