Most PCMs mandate that the engine coolant temperature sensor record temperatures above 160º F within 15 minutes of the engine starting. Letting them run too cool can problems after an extended period of time. Subscribe to our newsletter to receive the latest news from FIXD. It is triggered when your Jeep Commander‘s coolant temperature fails to reach the proper operating temperature. Jeep Commander P0138 Causes. The auto repair labor rates vary widely across the country, and even within the same city. Jeep Commander 5.7L Code P0128 is on from code start each time. Check the condition of the cooling system for rust deposits or mixture of different coolants. If other codes are present, they must be addressed first. This input is used by the Powertrain Control Module (PCM) for engine control and as an enabling criteria for some diagnosis. coolant level is good - Answered by a verified Dodge Mechanic We use cookies to give you the best possible experience on our website. How much do you know about cars? If you change the thermostat rest codes and drive around and see if it come back on if so I would start looking for leaks. They are presented in order (somewhat) of most to least likely to cause the problem. Error Code P0068 means the PCM has detected an excessive input voltage signal degree variation from the TIPS (Throttle Position Sensor) compared to the voltage input signals of MAF sensor and the MAP sensors. Generally caused by a thermostat that is partially stuck open and/or low engine coolant. Bad Oxygen Sensor– The O2 sensor itself is one of the most likely reasons that P0158 is triggering your service engine soon light. P0700 JEEP Meaning The transaxle Control Module (TCM) monitors the malfunction of sensors and actuators relating to transaxle control. It’s a generic powertrain code, which means that regardless of who manufactured the vehicle, it’ll have the same meaning (1996+). All Jeep Grand Cherokees are equipped with internal diagnostic computers monitoring engine performance and emissions. Scan your Jeep to verify P0128 is the only code present. I have replaced the fuel pump as well. Click a link to learn more about each one. The hose should be barely warm until the thermostat opens. Let us know if you liked the post. Check specific manufacturer pages on the site, as some of them, we list the OBD2 codes on those pages for those specific vehicles. to reach and maintain the correct operating temperature. That’s the only way we can improve. Vehicle: Jeep Commander 2006 jeep-commander-2006-5; 7l-code-p0128; 1 Answer. When the thermostat does open, hot coolant should start to flow and quickly warm up the radiator hose. It is triggered when your Jeep Commander ‘s coolant temperature fails to reach the proper operating temperature. The Grand Cherokee has been sold in the United States since 1993. The PCM of your Jeep will record if either of these two criteria are not met. There aren’t many symptoms with P0128, unless it gets cold. Commander 3.7/4.7/5.7L: 2006-08: VIN position 8 = K/N/P/2 JTEC: General information. Commander P0128 Symptoms 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 ratio of 14.7:1. When the TCM detects a malfunction with the control, a signal is send to the Engine Control Module to trigger the Engine Light or Service Engine Soon light.The ECM stores the P0700 code and it means the TCM detected a malfunction with the transaxle controls. Check your coolant level first to make sure it is full before continuing to operate the Jeep. It's a simple process for this vehicle. Contact Jeep customer service. Thermostat replacement on a 5.7L Dodge Hemi with a P0128 code. The Jeep Text Champion Hoodie is made of heavy duty 80/20 ringspun cotton/polyester. Coolant thermostat temperature below regulating temperature. P0128 sets when it takes longer than normal for the engine to reach operating temperature. If there is a large leak, it’ll throw P0455. Good luck figuring out what is going on with your Commander! What is the cost to diagnose the P1128 JEEP code Labor: 1.0 The cost to diagnose the P1128 JEEP code is 1.0 hour of labor. 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, however, you should be extremely careful when doing this as you could be burned. Most auto repairs shops charge between $75 and $150 per hour. The ohm reading will change with the temperature. Bad Oxygen Sensor– The O2 sensor itself is one of the most likely reasons that P0138 is triggering your service engine soon light. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. I have code po128 , I changed thermostat and sensor, code still there but when am using AC for a periode of time code is leaving, when turning off AC and going on heat (on my control) code is coming back. Most PCMs mandate that the engine coolant temperature sensor record temperatures above 160º F within 15 minutes of the engine starting. Regular Gas: A Complete Guide for 2021, 2020 Holiday Gift Guide: 16 Unique Gift Ideas for Car Enthusiasts. It’s a generic powertrain code, which means that regardless of who manufactured the vehicle, it’ll have the same meaning (1996+). The forward shoulders and relaxed 2x2 rib cuffed waistband will make this hoodie … A good way to at least get a good idea as to whether or not it’s the thermostat or the sensor is to start the car cold and let it idle for ten or so minutes. P0128 is a relatively common OBDII trouble code. padgett, here's what I have to go on regarding condtions for the P0128 to set. Many just replace the thermostat of their Jeep without checking all possible causes. Jeep Code P0128 Severity – Low A stuck open thermostat is most likely the problem, however thermostats are usually designed so when they fail they are stuck open allowing full flow of the coolant protecting your engine. Also, a mechanic will typically check under the hood where the radiator hose meets the thermostat housing. Cost of diagnosing the P2181 JEEP code Labor: 1.0 The cost of diagnosing the P2181 JEEP code is 1.0 hour of labor. If either fault is recorded again on the next engine startup, code P0128 is triggered. OBDII Jeep Code Definitions. All Rights Reserved. The PCM depends on three sensors – namely the MAF, MAP and Throttle Position sensor. Anything P1000 to P1999 or P3000 to P3400 will be Manufacturer specific and may not match the ones listed here. 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