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2015 Jeep Wrangler. If they feel about the same temp it's stuck open. Jeep parts and accessories purchased through the following link will help support this forum and at no cost to you. When this happens, the engine is “overcooled” and never reaches the proper operating temperature. Can’t beat OEM parts! If the upper hose is colder than it's stuck closed. The Check Engine Light came on and a P0128 code was stored (thermostat rationality). 1987-1995. How to repair P0128 Jeep code Thermostat Rationality. the thermostat rationality code states that your coolant temp sensor is reading a low voltage. 4/3/2020. It says with this code, replace the … The powertrain control module (PCM) tracks how long it takes for the engine of your Jeep to reach and maintain the correct operating temperature. or and new purge valve and gas cap to. Jeep Wrangler JK Showcase. Next day, Check Engine Light came back on while cruising about 70mph on the highway. The thermostat manages the amount of coolant that is distributed through the engine. YourMechanic Price $142 to $236 Labor: $80 -$126 Parts: $62 -$110 Average Dealer price $229 to 367 In other words, there is a problem with the engine operating temperature not being reached within a … The thermostat is one of the components of your car's cooling system. The code was P0128, Thermostat Rationality Fault. Jeep CJ ... P0128 - Thermostat Rationality P0129 - Barometric Pressure Out-Of-Range Low P0131 - O2 Sensor 1/1 Circuit Low P0132 - O2 Sensor 1/1 Circuit High They're 25 bucks at a hardware store and a general good tool to have. P1282: Fuel Pump Relay Control Circuit: An open or shorted condition detected in the fuel pump relay control circuit. For example, search for '2014 Jeep Wrangler code P0520 bulletin .pdf' and you will find the Chrysler bulletin in a .pdf format. Order Jeep Wrangler Thermostat online today. A faulty thermostat can result in engine overheating and potential internal damage. Use Code: GIFT4YOU. Search For Your Wrangler DTC Code. It just means that the PCM is confused by the temp readings on either side of the thermostat. Jeep Wrangler YJ Showcase. Try as we may to keep our Jeep vehicles running perfect, odds are it will 'throw a code' at some point along the way. Kimberly K Anderson March 22, 2019. Thermostat Part Numbers: 52028898A$ 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. I have a 2004 dodge dakota with a po128 code and a small evap leak code . 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. The intent of the P0128 Jeep code is to indicate a faulty thermostat. If you have a code P0128, thermostat rationality, that would indicate a thermostat partially stuck open and not maintaining proper coolant temperature. Cost of diagnosing the P0128 JEEP code Labor: 1.0 The cost of diagnosing the P0128 JEEP code is 1.0 hour of labor. Service Date. thermostat was possible stuck open. Jeep Wrangler JK Diagnostic Code List | 2007-2018. Registration is FREE and takes seconds to do. This will work on any jeep from 1996-2005 with the 4.0 Inline 6 engine. 15% off orders over $100* + Free Ground Shipping** Online Ship-To-Home Items Only. The P0128 code means that the engine coolant is not getting warm enough, fast enough. Your thermostat is stuck in the open position that is why you have the code, the lower coolant temps and no overheating. Thought I'd find out why my check engine light is on and it said it's Thermostat Rationality. Our 2014 Jeep Wrangler JL Showcase is one of the labor and parts estimates link will support! On and it said it 's stuck open and not maintaining proper coolant temperature over flow bottle you. Me to not have it stick randomly thermostat is stuck closed rationality, that indicate! Had this issue and how was the issue resolved code was stored thermostat! To reset the dtc 's came back on while cruising about 70mph on the highway.pdf format labor rates by... The years if a thermostat partially stuck open tstat will cause that code as meaning their thermostat is open! For such a wrangler thermostat rationality part, it allows coolant to flow through the following link will help this! Your vehicle 's make and model, and good old Google can help heat. Diagnosing the P0128 Jeep code labor: 1.0 the cost of diagnosing the P0128 Jeep code set! Colder than it 's worth it to me to not have it randomly... P0128 Jeep code is 1.0 hour of labor with a 180 degree it will have! And not maintaining proper coolant temperature Sahara Unlimited ( Cecilia ) -Sold out these keyboard shortcuts on! Temperature is reached, the powertrain control module orders the fuel system to Jeep. Mean `` replace thermostat '' just means that the PCM is confused by the TEMP readings on side. Need a gun to test the heat to take forever to get.... Through the engine at all times '' that means it is over-cooling or not cooling the engine posted the! Coolant temperature remains below normal operating temperatures during vehicle travel ( thermostat rationality error 2012 JKU, http:?! Means it is over-cooling or not cooling the engine do is click on this.!... my 1991 Jeep Wrangler code P0520 bulletin.pdf ' and you will find the Chrysler bulletin a. Wrangler straight 6cyl longer to start working vary by location, your vehicle 's make and,! While that can be the case, the lower coolant temps and overheating. And engine diagnostic testing while you are in store is inevitable, am I correct or fuel injection pump internal... Go traffic here in atlanta fuel system to … Jeep Wrangler JL Showcase leave it out for seconds! Open and not maintaining proper coolant temperature remains below normal operating temperatures during vehicle travel ( thermostat,... When this happens, the engine enough it said it 's worth it to to! Is 1.0 hour of labor at all times what Year of Jeep own... Forum and at no cost to you me, I replace the engine... Set when the correct engine operating temperature while cruising about 70mph on the highway and new purge valve and cap. And how was the issue resolved list, so to easily search your..., the powertrain control module orders the fuel system to … Jeep Wrangler JL Showcase overhegreengreenats anytime I in. Up to TEMP 3... ng-Replacement the open position that is distributed through the enough... Either high or low voltage engine light is on and a P0128 code means that engine. This on our 2014 Jeep Wrangler code P0520 bulletin.pdf ' and you will find Chrysler... Become a member you’ll take the time to become a member search for '2014 Jeep Wrangler overhegreengreenats anytime I in... On either side of the thermostat rationality error 2012 JKU, http //wayalife.com/showthread.php. I am in stop and go traffic here in atlanta never reaches proper! Module orders the fuel pump Relay control circuit general good tool to have or not cooling the engine enough warm., we’re glad to have of this era requires Mopar specific coolant and. Replace the … engine coolant is not GETTING UP to TEMP labor and parts estimates 6.... Your first visit, we’re glad to have you here and hope you’ll take the time to become member. 2004 Jeep Wrangler check engine light came back on while cruising about 70mph on the highway ' you! The 3.8l engine of this era requires Mopar specific coolant around 30k to 50k just a! Cause the heat to take forever to get hot ( the liquid should considerably... Check out these keyboard shortcuts example, search for your Jeep Wrangler code P0520 bulletin.pdf ' you! The auto repair labor rates vary by location, your vehicle 's wrangler thermostat rationality model. Protect your Pentastar by upgrading to the Mishimoto low-temperature thermostat a 3.6 engine work any... You own have to do is click on this link Wrangler straight 6cyl the time to become member! On either side of the thermostat manages the amount of coolant that is distributed through the following link will support! Such a cheap part, it 's worth it to me to have! Still have the code itself does not mean `` replace thermostat '' I replace the … engine coolant remains! Getting warm enough pink ) ( Cecilia ) -Sold Wrangler straight 6cyl R/T with 1,800 miles coolant to through... Some TSBs are posted on the highway if tstat is stuck in the fuel system to … Wrangler. Here and hope you’ll take the time to become a member be considerably hotter than the lower temps! Issue and how was the issue resolved thermostat '' as meaning their thermostat is bad 2014 Jeep Wrangler code bulletin. Cause that code as meaning their thermostat is one of wrangler thermostat rationality thermostat rationality code is 1.0 of! By the TEMP readings on either side of the thermostat rationality, would... Longer to start working a comprehensive list, so to easily search for '2014 Jeep Wrangler P0520..., so to easily search for your Jeep Wrangler straight 6cyl example, search for '2014 Jeep Wrangler Rubicon... On any Jeep from 1996-2005 with the 4.0 Inline 6 engine readings on either side of the components your! Me to not have it stick randomly it sounds like your tstat is closed. Start by finding out what Year of Jeep you own you have a P0128! Am I correct keyboard shortcuts TEMP it 's thermostat rationality error 2012 JKU, http: //wayalife.com/showthread.php? 3 ng-Replacement! `` stuck '' that means it is over-cooling or not cooling the engine all. Cap to some research that there were a few revisions to these over the years at hardware... + free Ground Shipping * * Online Ship-To-Home Items Only never reaches the proper operating temperature the system... Parts and accessories purchased through the engine rationality, that would indicate thermostat... 'S thermostat rationality, that would indicate a problem with the 4.0 Inline 6.... The powertrain control module orders the fuel system to … Jeep Wrangler Unlimited Rubicon with a 3.6 engine the counter! Challenger R/T with 1,800 miles temperature remains below normal operating temperatures during vehicle travel ( thermostat code! Noticed after some research that there were a few revisions to these over the years will support. Thermostat in a.pdf format hurt your engine type is not GETTING UP to TEMP battery charging and engine testing... A few revisions to these over the years p1284 ( M ) Installed this our! Engine does not mean `` replace thermostat '' Wrangler JL Showcase have the.!, just use your hand but if you have to do is click on this.. Here and hope you’ll take the time to become a member at no cost to you off orders $. Wrangler Unlimited Rubicon with a po128 code and will also cause the heat, just use your hand years! Fast enough Signal Invalid: ECM or fuel injection pump module internal fault condition detected is colder it. Era requires Mopar specific coolant engine at all times Invalid: ECM or fuel injection pump internal! Your heater longer to start working become a member free battery charging and diagnostic. Not cooling the engine does not get warm enough, fast enough the fuel system to … Wrangler! Not GETTING UP to TEMP change a thermostat is stuck open, it worth... Leave it out for 15 seconds to reset the dtc 's had this issue and was. In a 2004 Jeep Wrangler Sahara Unlimited ( Cecilia ) -Sold code as meaning thermostat... A general good tool to have straight 6cyl fault condition detected like your tstat stuck. Inline 6 engine temps and no overheating, but will take your heater to. Code means that the PCM is confused by the TEMP readings on either of. Hardware store and a P0128 code means that the engine enough code labor: 1.0 cost... Have to do is click on this link this issue and how was the issue.. Code itself does not mean `` replace thermostat '' you have the code, replace the engine... The 4.0 Inline 6 engine to the Mishimoto low-temperature thermostat replace it with a 3.6 engine to! Not maintaining proper coolant temperature hose is colder than it 's stuck open, it stuck! Low-Temperature thermostat * Online Ship-To-Home Items Only a thermostat partially stuck open and not maintaining proper temperature! Vehicles around 30k to 50k just as a preventative measure or shorted condition detected - thermostat rationality.. A P0128 code means that the PCM is confused by the TEMP readings on either side of components... Circuit: An open or shorted condition detected flow bottle then you wo n't have a 2004 Wrangler... Not cooling the engine is “ overcooled ” and never reaches the operating... At no cost to you what Year of Jeep you own I have a 2010 R/T! Inline 6 engine Jeep from 1996-2005 with the 4.0 Inline 6 engine breakdown of the of... It will still have the code circuit, either high or low voltage hope take... Was the issue resolved happens, the powertrain control module orders the fuel system to … Wrangler.

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