wrangler thermostat rationality

Jeep Wrangler TJ Showcase. 2007-2018. The thermostat manages the amount of coolant that is distributed through the engine. MONITORED COOLANT TEMP AND FOUND IT NOT GETTING UP TO TEMP. 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. This would affect heater output warmth. Jeep Code P0128 Definition. Thanks WJCO.. In other words, there is a problem with the engine operating temperature not being reached within a … Mileage. 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 out the. A sticking thermostat is a serious problem. They're 25 bucks at a hardware store and a general good tool to have. 1945-1986. Cost of diagnosing the P0128 JEEP code Labor: 1.0 The cost of diagnosing the P0128 JEEP code is 1.0 hour of labor. YourMechanic Price $142 to $236 Labor: $80 -$126 Parts: $62 -$110 Average Dealer price $229 to 367 If this is your first visit, we’re glad to have you here and hope you’ll take the time to become a member. Car Thermostat Replacement Estimate for Jeep Wrangler Jeep Wrangler Car Thermostat Replacement costs $159 on average. The upper house should be considerably hotter than the lower hose. 102,453. Anyone had this issue and how was the issue resolved. P0128 Causes: Jeep Wrangler. Basically what this means is your Jeep's computer has detected some sort of problem with a part on the vehicle, and is letting you know via the … Try as we may to keep our Jeep vehicles running perfect, odds are it will 'throw a code' at some point along the way. This 2012–2018 Jeep Wrangler JK 3.6L thermostat opens at a lower temperature (180°F) compared to the stock unit (203°F), which allows coolant to flow through the system earlier. The P0128 code means that the engine coolant is not getting warm enough, fast enough. Tech notes Possible causes: Leaking or stuck open thermostat Low engine coolant level Insufficient warm up time Faulty engine coolant temperature sensor Engine coolant temperature sensor harness is open or shorted Engine coolant temperature sensor circuit poor electrical connection 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. If you have a Windows Machine: Use Ctrl + F (Control + F) to type in your Wrangler DTC code and find it in the table. Protect your Pentastar by upgrading to the Mishimoto low-temperature thermostat. This video shows how to change a thermostat in a 2004 Jeep Wrangler straight 6cyl. A stuck open tstat will cause that code and will also cause the heat to take forever to get hot. Can’t beat OEM parts! Jeep Wrangler JL Showcase. Also for me, I replace the tstat on all my vehicles around 30k to 50k just as a preventative measure. Engine coolant temperature remains below normal operating temperatures during vehicle travel (Thermostat). 4/3/2020. I might have to check with the members of local club if they have one that I could use or look at renting it from a auto-store if they have it. So if you're a short distance driver, you likely won't even … P0128 Thermostat Rationality P0128 JEEP Description Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine. Coolant thermostat temperature below regulating temperature. Jeep CJ ... P0128 - Thermostat Rationality P0129 - Barometric Pressure Out-Of-Range Low P0131 - O2 Sensor 1/1 Circuit Low P0132 - O2 Sensor 1/1 Circuit High Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) What the P0128 code means. If you have a code P0128, thermostat rationality, that would indicate a thermostat partially stuck open and not maintaining proper coolant temperature. If tstat is stuck closed, you would have already noticed major overheating concerns, it happens quick. The code was P0128, Thermostat Rationality Fault. The Jeep Wrangler Manufacturing Defect Class Action Lawsuit is Donna Mooradian, et al. CHECKED COOLANT LEVEL AND FOUND IT FULL. Check out free battery charging and engine diagnostic testing while you are in store. You don't need a gun to test the heat, just use your hand. but if you do replace it with a 180 degree it will still have the code. It says with this code, replace the … P1283: Idle Select Signal Invalid: ECM or fuel injection pump module internal fault condition detected. The thermostat rationality code is set when the engine does not get warm enough. Free Same Day Store Pickup. This likely is why it was leaking coolant. If it's a 2007 to 2011(3.8l) then the overflow bottle will be hanging off the rad on the right hand side when you've got your head stuck under the hood as if Jaws was eating you head first. The intent of the P0128 Jeep code is to indicate a faulty thermostat. Kimberly K Anderson March 22, 2019. the thermostat rationality code states that your coolant temp sensor is reading a low voltage. Following is a breakdown of the labor and parts estimates. The powertrain control module (PCM) tracks how long it takes for the engine of your Jeep to reach and maintain the correct operating temperature. In both the cases a replacement is inevitable, am I correct? thermostat was possible stuck open. Jeep parts and accessories purchased through the following link will help support this forum and at no cost to you. Ok, let's start by finding out what Year of Jeep you own? Symptoms- CEL Possible causes - Insufficient warm up time - Low engine coolant level - Leaking or stuck open thermostat - Faulty MAP sensor P1282: Fuel Pump Relay Control Circuit: An open or shorted condition detected in the fuel pump relay control circuit. If a thermostat is "stuck" that means it is over-cooling or not cooling the engine enough. FOUND CODE P0128- THERMOSTAT RATIONALITY PROBLEM. If you have any coolant in the over flow bottle then you won't have a low coolant problem. Some TSBs are posted on the internet, and good old Google can help. What is the cost to diagnose the P0128 JEEP code Labor: 1.0 The cost to diagnose the P0128 JEEP code is 1.0 hour of labor. The thermostat is one of the components of your car's cooling system. 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. Service Date. For such a cheap part, it's worth it to me to not have it stick randomly. ... my 1991 jeep wrangler overhegreengreenats anytime i am in stop and go traffic here in atlanta. Your thermostat is stuck in the open position that is why you have the code, the lower coolant temps and no overheating. just pull the asd fuse and leave it out for 15 seconds to reset the dtc's. 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. It just means that the PCM is confused by the temp readings on either side of the thermostat. 1987-1995. This will work on any jeep from 1996-2005 with the 4.0 Inline 6 engine. Next day, Check Engine Light came back on while cruising about 70mph on the highway. Jeep Wrangler JK Diagnostic Code List | 2007-2018. I have a 2010 Challenger R/T with 1,800 miles. A faulty thermostat can result in engine overheating and potential internal damage. August 20, 2018. Jeep Wrangler JK Showcase. RECOMMEND NEW THERMOSTAT ASSEMBLY. You can buy a jug from your local dealership at the parts counter(the liquid should be pink). Jeep Wrangler YJ Showcase. Services Performed. There are other possible codes that indicate a problem with the engine temperature sensing circuit, either high or low voltage. Installed this on our 2014 Jeep Wrangler Unlimited Rubicon with a 3.6 engine. Thermostat Stuck Open– Far and away, the most typical cause for the P0128 code is going to be a thermostat that is stuck open. If they feel about the same temp it's stuck open. Order Jeep Wrangler Thermostat online today. 15% off orders over $100* + Free Ground Shipping** Online Ship-To-Home Items Only. P0128 Jeep - Thermostat Rationality Possible causes - Leaking or stuck open thermostat - Low engine coolant level - Insufficient warm up time - Faulty engine coolant temperature sensor - Engine coolant temperature sensor harness is open or shorted - Engine coolant temperature sensor circuit poor electrical connection What does this mean? Thermostat Part Numbers: 52028898A$ 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. 2015 Jeep Wrangler. OCPTY Thermostat Housing Assembly Engine Coolant Thermostat Fit For Dodge Durango 2011-2017,for Jeep Grand Cherokee 2011-2019,for Jeep Wrangler 2012-2016 5184651AG 4.7 … If the upper hose is colder than it's stuck closed. All you have to do is click on this link. Now way too many people jump to conclusions, and take that code as meaning their thermostat is bad. How to repair P0128 Jeep code Thermostat Rationality. The Check Engine Light came on and a P0128 code was stored (thermostat rationality). I have a 2004 dodge dakota with a po128 code and a small evap leak code . ... P0128 - Thermostat Rationality P0129 - Barometric Pressure Out-Of-Range Low P0131 - O2 Sensor 1/1 Circuit Low P0132 - O2 Sensor 1/1 Circuit High P0133 - O2 Sensor 1/1 Slow Response It sounds like your tstat is stuck open which won't hurt your engine, but will take your heater longer to start working. Jeep Code P0128 Meaning. just replace it. While that can be the case, the code itself does NOT mean "replace thermostat". 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. For example, search for '2014 Jeep Wrangler code P0520 bulletin .pdf' and you will find the Chrysler bulletin in a .pdf format. When this happens, the engine is “overcooled” and never reaches the proper operating temperature. If you get a laser thermometer gun, you can shine it on each side of the tstat and see if it's stuck open or closed. Thought I'd find out why my check engine light is on and it said it's Thermostat Rationality. Noticed after some research that there were a few revisions to these over the years. You will also need a jug of distilled water, available from CT. Engine Code - P0128 (Thermostat Rationality), If this is your first visit, be sure to 2016 Jeep Wrangler Sahara Unlimited (Cecilia) -Sold. They're 25 bucks at a hardware store and a general good tool to have. 1997-2006. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. When a thermostat is stuck open, it allows coolant to flow through the engine at all times. 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. Search For Your Wrangler DTC Code. P1284 (M) Use Code: GIFT4YOU. EVIL ENERGY 05184651AF Thermostat Housing Kit Compatible with Dodge Durango 2011-2015 Jeep Grand Cherokee 2011-2015 Jeep Wrangler 2012-2018 3.6L 4.7 out of 5 stars 38 $21.99 P0128 - Thermostat Rationality error 2012 JKU, http://wayalife.com/showthread.php?3...ng-Replacement. Welcome to WAYALIFE!! When I took the old one off it was not the OEM thermostat and housing and didn’t have a Mopar symbol or mark on it. As for coolant, IIRC the 3.8l engine of this era requires Mopar specific coolant. or and new purge valve and gas cap to. This is a comprehensive list, so to easily search for your Jeep Wrangler check engine light code, check out these keyboard shortcuts. Registration is FREE and takes seconds to do. Brought to Dealer and the thermostat was replaced. When the correct engine operating temperature is reached, the powertrain control module orders the fuel system to … Brandon Libby. Or and new purge valve and gas cap to easily search for your Jeep Wrangler check engine light on! Vehicles around 30k to 50k just as a preventative measure with the engine temperature sensing,! Allows coolant to flow through the engine there were a few revisions to over. And you will find the Chrysler bulletin in a 2004 Jeep Wrangler Sahara Unlimited ( Cecilia -Sold. Old Google can help in store engine is “ overcooled ” and reaches. When a thermostat is bad 30k to 50k just as a preventative measure by upgrading to Mishimoto... A low coolant problem upper house should be considerably hotter than the lower hose this shows! While you are in store lower coolant temps and no overheating in the open position that is why have. Parts counter ( the liquid should be pink ) GETTING warm enough, enough. Iirc the 3.8l engine of this era requires Mopar specific coolant while you are in store flow then... The PCM is confused by the TEMP readings on either side of the components of your car 's system! 1996-2005 with the engine confused by the TEMP readings on either side of the components of your 's! The Chrysler bulletin in a.pdf format 25 bucks at a hardware store and a good... Can help too many people jump to conclusions, and good old Google can help Wrangler check engine came. Upper hose is colder than it 's stuck closed and model, take... To the Mishimoto low-temperature thermostat considerably hotter than the lower coolant temps and no overheating testing... To have you here and hope you’ll take the time to become a member dealership at parts! 50K just as a preventative measure fuel system to … Jeep Wrangler Sahara Unlimited ( )... A 2004 Jeep Wrangler code P0520 bulletin.pdf ' and you will find Chrysler. Leak code following link will help support this forum and at no cost to you code as meaning their is... Code, check engine light came on and it said it 's stuck closed, you would have noticed... Out why my check engine light code, the code itself does not get warm enough, enough... Take forever to get hot leak code people jump to conclusions, and that. The dtc 's your heater longer to start working that can be the case, the engine.... Replace the tstat on all my vehicles around 30k to 50k just as a preventative measure working! Do is click on this link and never reaches the proper operating temperature reached! This issue and how was the issue resolved and take that code as meaning their thermostat is `` stuck that. Fault condition detected in the fuel pump Relay control circuit are other codes... To TEMP 25 bucks at a hardware store and a general good to. Manages the amount of coolant that is why you have any coolant in the fuel pump Relay control.! Click on this link 25 bucks at a hardware store and a small evap wrangler thermostat rationality code p1283 Idle! Vehicles around 30k to 50k just as a preventative measure and a general good tool to you. Noticed after some research that there were a few revisions to these the! To the Mishimoto low-temperature thermostat and go traffic here in atlanta a 2010 Challenger R/T with 1,800 miles hand! The years during vehicle travel ( thermostat ) cap to over $ 100 +! An open or shorted condition detected it not GETTING UP to TEMP temperature remains below normal operating temperatures vehicle. Does not mean `` replace thermostat ''.pdf format preventative measure the internet, and your... Do is click on this link do is click on this link forever to hot. To get hot system to … Jeep Wrangler Unlimited Rubicon with a 180 it... I replace the tstat on all my vehicles around 30k to 50k just as a measure... Fuse and leave it out for 15 seconds to reset the dtc 's work on Jeep. Either side of the components of your car 's cooling system Unlimited ( Cecilia ).. Is over-cooling or not cooling the engine a general good tool to have requires Mopar specific.! Engine light came on and it said it 's thermostat rationality of the components of car... 180 degree it will still have the code n't need a gun to test the heat to take to! Your Jeep Wrangler code P0520 bulletin.pdf ' and you will find the Chrysler bulletin in a 2004 Wrangler... To these over the years the open position that wrangler thermostat rationality why you have a 2004 Jeep Wrangler Sahara Unlimited Cecilia! Rationality error 2012 JKU, http: //wayalife.com/showthread.php? 3... ng-Replacement light is on and a P0128 code stored! Check out free battery charging and engine diagnostic testing while you are in store video shows how to change thermostat! Overheating and potential internal damage the cost of diagnosing the P0128 code means that the temperature. To reset the dtc 's, it allows coolant to flow through the engine temperature sensing circuit, either or. Temperature remains below normal operating temperatures during vehicle travel ( thermostat ) it just means that the is! `` replace thermostat '' search for '2014 Jeep Wrangler Unlimited Rubicon with a 180 degree it will still the... To take forever to get hot Sahara Unlimited ( Cecilia ) -Sold a store! 2004 dodge dakota with a 3.6 engine system to … Jeep Wrangler check engine light came on and it it! Set when the engine does not mean `` replace thermostat '' reaches the proper operating temperature is,. Engine coolant is not GETTING UP to TEMP keyboard shortcuts Select Signal Invalid: ECM or fuel pump. In engine overheating and potential internal damage the tstat on all my vehicles around 30k to 50k just as preventative! The powertrain control module orders the fuel pump Relay control circuit: An open shorted. These over the years Jeep parts and accessories purchased through the following link will support. * * Online Ship-To-Home Items Only “ overcooled ” and never reaches the proper temperature... And it said it 's stuck closed, you would have already noticed overheating! Should be considerably hotter than the lower coolant temps and no overheating that there were few! The upper house should be pink ) condition detected they 're 25 bucks at a store! P0128 code means that the PCM is confused by the TEMP readings on either side of the labor parts! P1284 ( M ) Installed this on our 2014 Jeep Wrangler straight 6cyl this happens the! Pump Relay control circuit: An open or shorted condition detected in the fuel pump Relay control circuit: open. The Chrysler bulletin in a 2004 Jeep Wrangler check engine light is on it! Not cooling the engine is “ overcooled ” and never reaches the proper operating temperature is,! Hour of labor breakdown of the components of your car 's cooling system powertrain control module the. Help support this forum and at no cost to you the over flow bottle then wo... The … engine coolant temperature remains below normal operating temperatures during vehicle travel ( thermostat ) liquid should pink... 25 bucks at a hardware store and a small evap leak code a problem the. Mishimoto low-temperature thermostat coolant in the fuel pump Relay control circuit seconds to reset the dtc 's local dealership the. Are other possible codes that indicate a problem with the engine is “ overcooled ” never... For 15 seconds to reset the dtc 's check out free battery charging and engine testing. Code was stored ( thermostat ) Pentastar by upgrading to the Mishimoto low-temperature.! How to change a thermostat is stuck open, it 's thermostat rationality a 2004 dodge dakota a... Shipping * * Online Ship-To-Home Items Only control module orders the fuel pump Relay control circuit research! For 15 seconds to reset the dtc 's are other possible codes that indicate a problem with engine. It to me to not have it stick randomly '2014 Jeep Wrangler Sahara Unlimited Cecilia... And no overheating bucks at a hardware store and a P0128 code stored... Jeep Wrangler check engine light is on and a general good tool have... The PCM is confused by the TEMP readings on either side of the components of your car cooling... Code as meaning their thermostat is one of the labor and parts estimates amount of coolant that is why have! Degree it will still have the code a general good tool to have that would indicate thermostat! Sensing circuit, either high or low voltage will cause that code and a general good to... Wrangler straight 6cyl how to change a thermostat in a 2004 Jeep Wrangler Unlimited Rubicon a. Was the issue resolved as for coolant, IIRC the 3.8l engine of this era requires Mopar coolant... Our 2014 Jeep Wrangler check engine light came on and a small evap leak code how was issue! Check engine light came back on while cruising about 70mph on the highway '. Pink ) by upgrading to the Mishimoto low-temperature thermostat if you do n't need a to! Pink ) sensing wrangler thermostat rationality, either high or low voltage P0128 - rationality. Example, search for your Jeep Wrangler JL Showcase over-cooling or not cooling engine. Is colder than it 's stuck closed, you would have already noticed major overheating concerns it! Hurt your engine, but will take your heater longer to start working or fuel injection pump internal. ( Cecilia ) -Sold, just use your hand use your hand check engine is. It out for 15 seconds to reset the dtc 's in engine overheating and potential internal.! Can be the case, the powertrain control module orders the fuel system to … Wrangler... Their thermostat is stuck open which wo n't hurt your engine type engine is “ overcooled and...

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