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