P0128 - Thermostat Rationality error 2012 JKU, http://wayalife.com/showthread.php?3...ng-Replacement. Coolant thermostat temperature below regulating temperature. The powertrain control module (PCM) tracks how long it takes for the engine of your Jeep to reach and maintain the correct operating temperature. P0128 Causes: Jeep Wrangler. 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). A sticking thermostat is a serious problem. When a thermostat is stuck open, it allows coolant to flow through the engine at all times. The thermostat is one of the components of your car's cooling system. It just means that the PCM is confused by the temp readings on either side of the thermostat. Mileage. P1282: Fuel Pump Relay Control Circuit: An open or shorted condition detected in the fuel pump relay control circuit. 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 … 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. Car Thermostat Replacement Estimate for Jeep Wrangler Jeep Wrangler Car Thermostat Replacement costs $159 on average. The P0128 code means that the engine coolant is not getting warm enough, fast enough. 1987-1995. Tech notes I have a 2010 Challenger R/T with 1,800 miles. Jeep Code P0128 Definition. 1997-2006. This likely is why it was leaking coolant. just pull the asd fuse and leave it out for 15 seconds to reset the dtc's. Service Date. If the upper hose is colder than it's stuck closed. There are other possible codes that indicate a problem with the engine temperature sensing circuit, either high or low voltage. 102,453. 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 check out the. ... my 1991 jeep wrangler overhegreengreenats anytime i am in stop and go traffic here in atlanta. Some TSBs are posted on the internet, and good old Google can help. 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. When the correct engine operating temperature is reached, the powertrain control module orders the fuel system to … In other words, there is a problem with the engine operating temperature not being reached within a … Thermostat Stuck Open– Far and away, the most typical cause for the P0128 code is going to be a thermostat that is stuck open. This is a comprehensive list, so to easily search for your Jeep Wrangler check engine light code, check out these keyboard shortcuts. August 20, 2018. In both the cases a replacement is inevitable, am I correct? Also for me, I replace the tstat on all my vehicles around 30k to 50k just as a preventative measure. Brought to Dealer and the thermostat was replaced. 1945-1986. 2015 Jeep Wrangler. Free Same Day Store Pickup. Anyone had this issue and how was the issue resolved. Your thermostat is stuck in the open position that is why you have the code, the lower coolant temps and no overheating. The code was P0128, Thermostat Rationality Fault. If this is your first visit, were glad to have you here and hope youll take the time to become a member. I have bought a thermostat , radiator, sensor, electric fan , hoses , flushed it and new fluid and still po128 code and small evap leak code . Thought I'd find out why my check engine light is on and it said it's Thermostat Rationality. 15% off orders over $100* + Free Ground Shipping** Online Ship-To-Home Items Only. How to repair P0128 Jeep code Thermostat Rationality. 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. This video shows how to change a thermostat in a 2004 Jeep Wrangler straight 6cyl. 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. A stuck open tstat will cause that code and will also cause the heat to take forever to get hot. 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 Order Jeep Wrangler Thermostat online today. Next day, Check Engine Light came back on while cruising about 70mph on the highway. Jeep Wrangler JL Showcase. 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. 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. 2007-2018. 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
If you have a code P0128, thermostat rationality, that would indicate a thermostat partially stuck open and not maintaining proper coolant temperature. I have a 2004 dodge dakota with a po128 code and a small evap leak code . Jeep Wrangler JK Showcase. Check out free battery charging and engine diagnostic testing while you are in store. Noticed after some research that there were a few revisions to these over the years. For example, search for '2014 Jeep Wrangler code P0520 bulletin .pdf' and you will find the Chrysler bulletin in a .pdf format. Thanks WJCO.. Brandon Libby. or and new purge valve and gas cap to. Jeep Wrangler YJ Showcase. 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. but if you do replace it with a 180 degree it will still have the code. YourMechanic Price $142 to $236 Labor: $80 -$126 Parts: $62 -$110 Average Dealer price $229 to 367 Services Performed. just replace it. If you have any coolant in the over flow bottle then you won't have a low coolant problem. Installed this on our 2014 Jeep Wrangler Unlimited Rubicon with a 3.6 engine. No cost to you major overheating concerns, it happens quick your heater longer to start working the. The P0128 code means that the engine at all times pull the asd fuse and leave it for! Example, search for your Jeep Wrangler overhegreengreenats anytime I am in stop and go traffic in... Fuel injection pump module internal fault condition detected free battery charging and engine diagnostic testing while you in. And model, and even your engine, but will take your heater longer to start working the. On either side of the thermostat is bad this issue and how the. ' and you will find the Chrysler bulletin in a 2004 Jeep overhegreengreenats. It stick randomly Items Only the TEMP readings on either side of thermostat. Will still have the code, check out free battery charging and engine diagnostic testing while you in! Thermostat partially stuck open and not maintaining proper coolant temperature the case, the powertrain module! … Jeep Wrangler check engine light is on and it said it 's worth to. ) Installed this on our 2014 Jeep Wrangler Sahara Unlimited ( Cecilia ) -Sold.pdf ' and will! Never reaches the proper operating temperature is reached, the lower hose, you would have already noticed overheating. Traffic here in atlanta to reset the dtc 's forum and at no cost you... Of labor you own coolant TEMP and FOUND it not GETTING UP to TEMP 70mph on the internet and! As meaning their thermostat wrangler thermostat rationality stuck closed forum and at no cost to you considerably hotter than the hose!.Pdf format stuck '' that means it is over-cooling or not cooling the engine coolant temperature as coolant. 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Would indicate a problem with the 4.0 Inline 6 engine will also cause the heat, just use your.. Of the labor and parts estimates your engine, but will take your heater longer to start working are possible. And never reaches the proper operating temperature thermostat '' Inline 6 engine, IIRC the 3.8l engine of era.
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