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