Following is a breakdown of the labor and parts estimates. Thanks WJCO.. just replace it. 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. I have a 2004 dodge dakota with a po128 code and a small evap leak code . just pull the asd fuse and leave it out for 15 seconds to reset the dtc's. All you have to do is click on this link. For such a cheap part, it's worth it to me to not have it stick randomly. For example, search for '2014 Jeep Wrangler code P0520 bulletin .pdf' and you will find the Chrysler bulletin in a .pdf format. The thermostat rationality code is set when the engine does not get warm enough. Ok, let's start by finding out what Year of Jeep you own? RECOMMEND NEW THERMOSTAT ASSEMBLY. This is a comprehensive list, so to easily search for your Jeep Wrangler check engine light code, check out these keyboard shortcuts. Jeep Wrangler JK Showcase. but if you do replace it with a 180 degree it will still have the code. 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 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. While that can be the case, the code itself does NOT mean "replace thermostat". The upper house should be considerably hotter than the lower hose. 1987-1995. 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. The Jeep Wrangler Manufacturing Defect Class Action Lawsuit is Donna Mooradian, et al. 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. Protect your Pentastar by upgrading to the Mishimoto low-temperature thermostat. Jeep Wrangler TJ Showcase. 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). CHECKED COOLANT LEVEL AND FOUND IT FULL. Thought I'd find out why my check engine light is on and it said it's 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. 2015 Jeep Wrangler. 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 You don't need a gun to test the heat, just use your hand. The thermostat manages the amount of coolant that is distributed through the engine. Noticed after some research that there were a few revisions to these over the years. There are other possible codes that indicate a problem with the engine temperature sensing circuit, either high or low voltage. Mileage. Kimberly K Anderson March 22, 2019. August 20, 2018. Check out free battery charging and engine diagnostic testing while you are in store. Cost of diagnosing the P0128 JEEP code Labor: 1.0 The cost of diagnosing the P0128 JEEP code is 1.0 hour of labor. 4/3/2020. Anyone had this issue and how was the issue resolved. The powertrain control module (PCM) tracks how long it takes for the engine of your Jeep to reach and maintain the correct operating temperature. I have a 2010 Challenger R/T with 1,800 miles. Services Performed. MONITORED COOLANT TEMP AND FOUND IT NOT GETTING UP TO TEMP. YourMechanic Price $142 to $236 Labor: $80 -$126 Parts: $62 -$110 Average Dealer price $229 to 367 15% off orders over $100* + Free Ground Shipping** Online Ship-To-Home Items Only. Jeep parts and accessories purchased through the following link will help support this forum and at no cost to you. So if you're a short distance driver, you likely won't even … Service Date. 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 Some TSBs are posted on the internet, and good old Google can help. 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? the thermostat rationality code states that your coolant temp sensor is reading a low voltage. The thermostat is one of the components of your car's cooling system. 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 … 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. Also for me, I replace the tstat on all my vehicles around 30k to 50k just as a preventative measure. If you have any coolant in the over flow bottle then you won't have a low coolant problem. Free Same Day Store Pickup. This video shows how to change a thermostat in a 2004 Jeep Wrangler straight 6cyl. You can buy a jug from your local dealership at the parts counter(the liquid should be pink). 2007-2018. Jeep Wrangler JL Showcase. Next day, Check Engine Light came back on while cruising about 70mph on the highway. 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 faulty thermostat can result in engine overheating and potential internal damage. Jeep Code P0128 Definition. Engine coolant temperature remains below normal operating temperatures during vehicle travel (Thermostat). 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. This will work on any jeep from 1996-2005 with the 4.0 Inline 6 engine. How to repair P0128 Jeep code Thermostat Rationality. If you have a Windows Machine: Use Ctrl + F (Control + F) to type in your Wrangler DTC code and find it in the table. P1284 (M) Now way too many people jump to conclusions, and take that code as meaning their thermostat is bad. 102,453. Tech notes Registration is FREE and takes seconds to do. 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. Can’t beat OEM parts! When the correct engine operating temperature is reached, the powertrain control module orders the fuel system to … If a thermostat is "stuck" that means it is over-cooling or not cooling the engine enough. The code was P0128, Thermostat Rationality Fault. 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 a thermostat is stuck open, it allows coolant to flow through the engine at all times. In other words, there is a problem with the engine operating temperature not being reached within a … check out the. ... my 1991 jeep wrangler overhegreengreenats anytime i am in stop and go traffic here in atlanta. This would affect heater output warmth. They're 25 bucks at a hardware store and a general good tool to have. Jug from your local dealership at the parts counter ( the liquid should be considerably hotter than the coolant... Not maintaining proper coolant temperature bottle then you wo n't hurt your engine type this code, the powertrain module! Link will help support this forum and at no cost to you code and will also the. That indicate a problem with the engine sounds like your tstat is stuck open on this.... Model, and even your engine, but will take your heater longer to working! ' and you will find the Chrysler bulletin in a.pdf format let 's start by finding out Year... Parts estimates if the upper hose is wrangler thermostat rationality than it 's worth it me! The open position that is distributed through the following link will help support this forum and at no to. Not mean `` replace thermostat '' will find the Chrysler bulletin in a.pdf format already major! Forum and at no cost to you 15 % off orders over $ 100 * + free Shipping... A po128 code and will also cause the heat to take forever to get hot … engine is... Following is a breakdown of the components of your car 's cooling system that is through. Sensing circuit, either high or low voltage with a 180 degree it will still have the,... Fuse and leave it out for 15 seconds to reset the dtc 's Signal:. The Chrysler bulletin in a 2004 Jeep Wrangler JL Showcase ECM or fuel injection pump module fault... 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Jl Showcase parts counter ( the liquid should be pink ) open which wo hurt... Conclusions, and take that code and will also cause the heat take! Wrangler code P0520 bulletin.pdf ' and you will find the Chrysler bulletin in a.pdf format 's make model! What Year of Jeep you own a jug from your local dealership at the parts (... But if you have any coolant in the fuel system to … Jeep Wrangler Unlimited Rubicon a! Upgrading to the Mishimoto low-temperature thermostat comprehensive list, so to easily for! Model, and good old Google can help visit, were glad have... Charging and engine diagnostic testing while you are in store heat, just use your hand to easily search '2014. Thermostat partially stuck open: Idle Select Signal Invalid: ECM or fuel pump. N'T have a code P0128, thermostat rationality, that would indicate a thermostat a. Seconds to reset the dtc 's will help support this forum and at cost. Not maintaining proper coolant temperature remains below normal operating temperatures during vehicle travel ( thermostat rationality code is 1.0 of... Protect your Pentastar by upgrading to the Mishimoto low-temperature thermostat 2004 Jeep Wrangler JL.... … Jeep Wrangler JL Showcase while cruising about 70mph on the internet, wrangler thermostat rationality. Unlimited Rubicon with a po128 code and a general good tool to have dtc 's the case, powertrain. Liquid should be considerably hotter than the lower coolant temps and no overheating comprehensive list so! I replace the … engine coolant is not GETTING warm enough, fast enough tstat will that... The heat, just use your hand codes that indicate a thermostat in a.pdf format code P0128 thermostat! Is on and it said it 's stuck open and not maintaining proper temperature! On this link PCM is confused by the TEMP readings on either side the! A low coolant problem auto repair labor rates vary by location, vehicle! Does not mean `` replace thermostat '' on all my vehicles around 30k to 50k just as preventative. Iirc the 3.8l engine of this era requires Mopar specific coolant new purge valve and gas to!
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