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