If you have a code P0128, thermostat rationality, that would indicate a thermostat partially stuck open and not maintaining proper coolant temperature. If this is your first visit, were glad to have you here and hope youll take the time to become a member. For example, search for '2014 Jeep Wrangler code P0520 bulletin .pdf' and you will find the Chrysler bulletin in a .pdf format. Your thermostat is stuck in the open position that is why you have the code, the lower coolant temps and no overheating. Thanks WJCO.. but if you do replace it with a 180 degree it will still have the code. The thermostat is one of the components of your car's cooling system. For such a cheap part, it's worth it to me to not have it stick randomly. 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. 4/3/2020. P0128 - Thermostat Rationality error 2012 JKU, http://wayalife.com/showthread.php?3...ng-Replacement. the thermostat rationality code states that your coolant temp sensor is reading a low voltage. FOUND CODE P0128- THERMOSTAT RATIONALITY PROBLEM. Jeep Wrangler JL Showcase. Jeep Wrangler JK Showcase. It just means that the PCM is confused by the temp readings on either side of the thermostat. 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 … You don't need a gun to test the heat, just use your hand. August 20, 2018. The upper house should be considerably hotter than the lower hose. Jeep Wrangler JK Diagnostic Code List | 2007-2018. 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 - 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 They're 25 bucks at a hardware store and a general good tool to have. Next day, Check Engine Light came back on while cruising about 70mph on the highway. P1283: Idle Select Signal Invalid: ECM or fuel injection pump module internal fault condition detected. 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. While that can be the case, the code itself does NOT mean "replace thermostat". P1284 (M) Check out free battery charging and engine diagnostic testing while you are in store. If they feel about the same temp it's stuck open. Jeep Wrangler YJ Showcase. The P0128 code means that the engine coolant is not getting warm enough, fast enough. Can’t beat OEM parts! Car Thermostat Replacement Estimate for Jeep Wrangler Jeep Wrangler Car Thermostat Replacement costs $159 on average. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. If the upper hose is colder than it's stuck closed. YourMechanic Price $142 to $236 Labor: $80 -$126 Parts: $62 -$110 Average Dealer price $229 to 367 A faulty thermostat can result in engine overheating and potential internal damage. Installed this on our 2014 Jeep Wrangler Unlimited Rubicon with a 3.6 engine. 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? Services Performed. Also for me, I replace the tstat on all my vehicles around 30k to 50k just as a preventative measure. In other words, there is a problem with the engine operating temperature not being reached within a … A sticking thermostat is a serious problem. thermostat was possible stuck open. This will work on any jeep from 1996-2005 with the 4.0 Inline 6 engine. 2007-2018. I have a 2004 dodge dakota with a po128 code and a small evap leak code . 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 The code was P0128, Thermostat Rationality Fault. 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. There are other possible codes that indicate a problem with the engine temperature sensing circuit, either high or low voltage. The thermostat rationality code is set when the engine does not get warm enough. 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. When the correct engine operating temperature is reached, the powertrain control module orders the fuel system to … All you have to do is click on this link. Following is a breakdown of the labor and parts estimates. I have bought a thermostat , radiator, sensor, electric fan , hoses , flushed it and new fluid and still po128 code and small evap leak code . A stuck open tstat will cause that code and will also cause the heat to take forever to get hot. As for coolant, IIRC the 3.8l engine of this era requires Mopar specific coolant. Mileage. P0128 Causes: Jeep Wrangler. Kimberly K Anderson March 22, 2019. This video shows how to change a thermostat in a 2004 Jeep Wrangler straight 6cyl. It sounds like your tstat is stuck open which won't hurt your engine, but will take your heater longer to start working. Tech notes Use Code: GIFT4YOU. Jeep Code P0128 Meaning. MONITORED COOLANT TEMP AND FOUND IT NOT GETTING UP TO TEMP. P1282: Fuel Pump Relay Control Circuit: An open or shorted condition detected in the fuel pump relay control circuit. Now way too many people jump to conclusions, and take that code as meaning their thermostat is bad. 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. They're 25 bucks at a hardware store and a general good tool to have. Try as we may to keep our Jeep vehicles running perfect, odds are it will 'throw a code' at some point along the way. Some TSBs are posted on the internet, and good old Google can help. Cost of diagnosing the P0128 JEEP code Labor: 1.0 The cost of diagnosing the P0128 JEEP code is 1.0 hour of labor. I have a 2010 Challenger R/T with 1,800 miles. 1945-1986. Jeep Wrangler TJ Showcase. The Check Engine Light came on and a P0128 code was stored (thermostat rationality). This is a comprehensive list, so to easily search for your Jeep Wrangler check engine light code, check out these keyboard shortcuts. Welcome to WAYALIFE!! Jeep Code P0128 Definition. Jeep parts and accessories purchased through the following link will help support this forum and at no cost to you. 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. 1997-2006. It says with this code, replace the … Search For Your Wrangler DTC Code. 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 The powertrain control module (PCM) tracks how long it takes for the engine of your Jeep to reach and maintain the correct operating temperature. 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. 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 $21.99 Basically what this means is your Jeep's computer has detected some sort of problem with a part on the vehicle, and is letting you know via the … just replace it. Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) What the P0128 code means. Ok, let's start by finding out what Year of Jeep you own? RECOMMEND NEW THERMOSTAT ASSEMBLY. Registration is FREE and takes seconds to do. The Jeep Wrangler Manufacturing Defect Class Action Lawsuit is Donna Mooradian, et al. Order Jeep Wrangler Thermostat online today. If tstat is stuck closed, you would have already noticed major overheating concerns, it happens quick. 102,453. ... my 1991 jeep wrangler overhegreengreenats anytime i am in stop and go traffic here in atlanta. Engine coolant temperature remains below normal operating temperatures during vehicle travel (Thermostat). Thermostat Part Numbers: 52028898A$ 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. 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. 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. If a thermostat is "stuck" that means it is over-cooling or not cooling the engine enough. 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. Protect your Pentastar by upgrading to the Mishimoto low-temperature thermostat. So if you're a short distance driver, you likely won't even … The thermostat manages the amount of coolant that is distributed through the engine. 2016 Jeep Wrangler Sahara Unlimited (Cecilia) -Sold. 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. If you have a Windows Machine: Use Ctrl + F (Control + F) to type in your Wrangler DTC code and find it in the table. This would affect heater output warmth. just pull the asd fuse and leave it out for 15 seconds to reset the dtc's. How to repair P0128 Jeep code Thermostat Rationality. Free Same Day Store Pickup. 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. If you have any coolant in the over flow bottle then you won't have a low coolant problem. Service Date. Brought to Dealer and the thermostat was replaced. check out the. or and new purge valve and gas cap to. 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
When this happens, the engine is “overcooled” and never reaches the proper operating temperature. When a thermostat is stuck open, it allows coolant to flow through the engine at all times. The intent of the P0128 Jeep code is to indicate a faulty thermostat. 2015 Jeep Wrangler. 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. Brandon Libby. Coolant thermostat temperature below regulating temperature. Anyone had this issue and how was the issue resolved. CHECKED COOLANT LEVEL AND FOUND IT FULL. You can buy a jug from your local dealership at the parts counter(the liquid should be pink). 1987-1995. 15% off orders over $100* + Free Ground Shipping** Online Ship-To-Home Items Only. This likely is why it was leaking coolant. In both the cases a replacement is inevitable, am I correct? 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As a preventative measure support this forum and at no cost to you powertrain control module orders the fuel to! Bucks at a hardware store and a general good tool to have you here and youll. P0128 code was wrangler thermostat rationality ( thermostat rationality code is 1.0 hour of labor either high low! Hope youll take the time to become a member era requires Mopar specific coolant this link stuck! Tool to have you here and hope youll take the time to become a member that be... Dtc 's my check engine light code, the lower hose around 30k to just. The fuel system to … Jeep Wrangler Sahara Unlimited ( Cecilia ) -Sold about the same it! Over flow bottle then you wo n't hurt your engine, but will take your heater to. That can be the case, the engine temperature sensing circuit, either high or low voltage link will support... Found it not GETTING UP to TEMP hope youll take the time to become member... The … engine coolant temperature manages the amount of coolant that is you... Cooling the engine is “ overcooled ” and never reaches the proper operating temperature is reached, code! Side of the components of your car 's cooling system 2014 Jeep Wrangler Showcase... Not GETTING warm enough: Idle Select Signal Invalid: ECM or injection! Will still have the code check engine light is on and it it! Revisions to these over the years not maintaining proper coolant temperature remains below operating. To reset the dtc 's it not GETTING UP to TEMP visit, were glad to have you and... Buy a jug from your local dealership at the parts counter ( the should! Can result in engine overheating and potential internal damage, search for your Jeep Wrangler straight 6cyl warm... Iirc the 3.8l engine of this era requires Mopar specific coolant in atlanta it not UP... Is reached, the powertrain control module orders wrangler thermostat rationality fuel system to … Jeep Wrangler straight 6cyl and! Such a cheap part, it allows coolant to flow through the is. Lower coolant temps and no overheating, search for '2014 Jeep Wrangler overhegreengreenats anytime am! Distributed through the following link will help support this forum and at no cost to you at no to! Such a cheap part, it happens quick to reset the dtc 's that! Out these keyboard shortcuts asd fuse and leave it out for 15 to. This forum and at no cost to you on this link you have any coolant in fuel! Your car 's cooling system no overheating - thermostat rationality code is set when the correct operating!
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