So the engine light pop immediately. The most common cause for P0128 is the engine coolant thermostat is stuck open. Jeep P0128 Diagnose and fix Jeep P0128. Have you replaced any parts? Join the discussion. Dodge Code P0128 Meaning The powertrain control module (PCM) tracks how long it takes for the engine of your Dodge to reach and maintain the correct operating temperature. P0128 JEEP Description An Engine Coolant Temperature (ECT) sensor monitors the temperature of the coolant. P0128 is a relatively common OBDII trouble code. P0128 is a relatively common OBDII trouble code. A P0128 is a code is an indication of a faulty thermostat or ECT (engine coolant temp sensor). Anyway the code is P0128 for Thermostat. Check the cooling system to make sure that the coolant is in good condition and at the proper level. A simple way to diagnose this is to feel the radiator hose and monitor how hot the temperature of the coolant is when it starts flowing through the radiator hose. Jeep P0128 Diagnose and fix Jeep P0128. What type of Thermostat is recommended for a TJ 2005 6cyl? If engine coolant temperature is above 65°C (149°F), allow the engine to cool until it is below 65°C (149°F). This involves a few Chrysler models equipped with the 3.5L engine. This conclusion is reached based on the intake air temperature sensor reading, the length of time your vehicle has been runni… Discussion Starter • #1 • Feb 16, 2013 ... Had ~16K on mine when this code first popped up, but had noticed it never getting up normal temp on the gauge for about 3 weeks prior. P0128-THERMOSTAT RATIONALITY Theory of Operation The thermostat rationality diagnostic runs during a drive cycle that starts with the coolant temperature below 140°F. Help us improve AutoCodes.com. The owner came up plugged in his reader and sure enough Code P0128 came up. Diagnose code P0128 Thermostat Rationality, P06DD Engine Oil Pressure control circuit stuck off, P06DA Engine Oil Pressure control circuit, P06DE Engine Oil Pressure Control Circuit Stuck On, C2116 JEEP, DODGE, CHRYSLER ABS Pump Supply Low Voltage, U0151-Lost Communication with Occupant Restraint Controller (ORC), C123F-Steering Angle Sensor comparative performance. You may have to register before you can post: click the register link above to proceed. P0128 THERMOSTAT RATIONALITY When Monitored and Set Condition: When Monitored: While the engine is running. It’s a generic powertrain code, which means that regardless of who manufactured the vehicle, it’ll have the same meaning (1996+). POSSIBLE CAUSES 2011 JK EVO Bolt-on Coilovers, EVO 1/4 pounder w/ stinger, 37" Cooper STT Pros, PR44, and some EVO stuff 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. 1 - 6 of 6 Posts. 213 Posts . Faulty intake air temperature (IAT) sensor In other words, there is a problem with the engine operating temperature not being reached within a certain amount of time. For connector identification, see CONNECTOR IDENTIFICATION . It’s a generic powertrain code, which means that regardless of who manufactured the vehicle, it’ll have the same meaning (1996+). Now way too many people jump to conclusions, and take that code as meaning their thermostat is bad. Start the engine, check for proper operation of the cooling system while the engine warms up toward operating temperature. When the correct engine operating temperature is reached, the powertrain control module orders the fuel system to enter “closed loop” where readings from the oxygen sensors are used to maintain the efficient air to fuel … For circuit identification and Faulty coolant temperature (ECT) sensor 5. What are the symptoms on your vehicle for the P0128 Chrysler code? 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. Btw, 2013 JKU w 80k. just replace it. Check Engine Light Code: P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) Replace Thermostat: the new thermostat will come with the thermostat housing and the sensor all in one. Mechanic says it might be a clogged or dirty heater core. Remove battery drain cooling system from the bottom of rad, (coolant drain) Bolt OFF, and ON, and then purge the air from the system, (Burp system) by letting … I already replaced the front right sensor to the hub 2012 dodge 1500 slt October 16, 2013, wednesday early evening, east of the pacific ocean, selectee for truly random and boring Parking lot photo of the moment grand platinum prize winner! Set Condition: The coolant temperature does not rise by a calibrated amount over a calibrated amount of time. If any ECT or AAT DTC are present, diagnose and repair those DTC before continuing with this test procedure. Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) What the P0128 code means. Yes, perform the appropriate repair in accordance with the service information. In other words the engine is running too cold – or at least the PCM thinks it is. What is meant by "I burped the radiator"? Be certain to check the Radiator cap, flow through the Radiator and anything that can cause a lack of system pressure or lack of coolant flow in the system. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. 2015 Dodge Dart GT (Daily Driver) 2006 Dodge Charger Daytona Top Banana #3874 1970 Dodge Dart Custom 225 Slant Six. Mechanic's Assistant: Does the light stay on, or does it blink? The engine light is constant, the serv 4x4 and traction control comes off and on. just pull the asd fuse and leave it out for 15 seconds to reset the dtc's. It should be covered under your 8/80 extended federal emissions warranty. 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. thermostat was possible stuck open. The code was P0128, Thermostat Rationality Fault. Once the engine reaches its operating temperature, the thermostat opens. 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