Does a code p0128 reset itself after repairs or does it have to be cleared? Common mistakes when diagnosing the P0128 code. The code doesn't go off for a week after we reset. If the coolant is low, fill it back up and reset the check engine light. Check the coolant level and condition. If other codes are present, they must be addressed first. So I took it to my neighborhood mechanic and he told me that the monitors had to be reset at a Mazda dealer. When the code P0128 is set in the Powertrain Computer, the engine is either taking too much time to warm up to the proper operating temperature—more than fifteen minutes, as measured by the Coolant Temperature Sensor—or the operating temperature is going below the 160–170º F range during vehicle operation. All is good now. note: i originally had this in the e46 forum but decide this is a better forum so I deleted the other post. It could be one or more of the following problems: In most cases you will get a P0128 – Coolant temperature below thermostat regulating temperature fault code. Speed was 58. In most cases you will get a P0128 – Coolant temperature below thermostat regulating temperature fault code. Good luck figuring out what is going on with your Silverado! OBD codes (On-Board Diagnostics) let you know something is wrong with your car's engine. It reappeared again yesterday. The two codes from the check engine light are: P0126 & P0128. You may see other codes, P0126 or P0128, when you get the P0125 code. P0128: This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. hi, my "service engine soon" light came on 2 weeks ago. P0128: This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. P0128 Code- Replaced TSTAT and Coolant, Light is still on If this is your first visit, be sure to check out the FAQ by clicking the link above. I lost maybe a quart including draining the coolant reservoir that I replaced. BAT Team Discussions for P0128. The check engine light in my 2005 Accord came on about three weeks ago. 0 votes . 165 F stored in freeze frame data, changing the thermostat was fairly easy, ($32.50 from Auto Parts at AutohausAZ - OEM Auto Parts - Discount Replacement Parts, Resources and Car Care Tips) drain some antifreeze out of the system, remove the air tube from infront of the thermostat housing on the front of the engine, … OBD codes (On-Board Diagnostics) let you know something is wrong with your car's engine. It showed that when the P0128 code was activated the car had been running 16 mins. Brought it to the mechanic, who said it was code P0128. P0128 code. So I took it to my neighborhood mechanic and he told me that the monitors had to be reset at a Mazda dealer. Check coolant level 2. To be fair, the P0128 is not the most difficult of all the codes that you need to consider. If the readings you get in the Coolant Temperature will not go beyond 160° – 170° F in the span of 15 minutes, then try to put your foot on the brake, shift to Drive and then press the throttle for around two to three minutes and see if the readings increase. There aren’t many symptoms with P0128, unless it gets cold. Same as you, my heat was working fine, operating temp was in the right spot. You may have to register before you can post: click the register link above to proceed. code p0128- thermostat malfunction. Reply. It reappeared again yesterday. You can verify this by reading the ECU fault codes. It's inadvisable to reset an OBD code without addressing the problem that caused it, … I got this code about 6 days ago and reset it with my scan tool. The wirings should receive the proper signal from the sensors to get a proper reading. Code P0128 is engaged specifically when the engine itself does not get to operating temperature in a specified time period. These codes can often help you narrow down the problem to find the solution. Couple of weeks ago my 2006 LR3 ran a p0128 fault code so I changed the T-stat and also the ECT sensor my problem is the mechanic told me to drive it so it can cycle thru on the computer and clear the code so the check engine light will shut off well the problem is the engine temp gauge on my dash board still is barely moving up usually sits between half and a quarter so what else could it be 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. I replaced the thermostat. 165 F stored in freeze frame data, changing the thermostat was fairly easy, ($32.50 from Auto Parts at AutohausAZ - OEM Auto Parts - Discount Replacement Parts, Resources and Car Care Tips) drain some antifreeze out of the system, remove the air tube from infront of the thermostat housing on the front of the engine, … I tried to diconnect the battery, it as did not work. Ambient temp 34f. Here is what I found according to my research: P0126 is either replace coolant temperature sensor or replace the thermostat. 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. To be fair, the P0128 is not the most difficult of all the codes that you need to consider. Most auto repairs shops charge between $75 … The cost to diagnose the P0128 code is 1.0 hour of labor. What does the code P0125 mean? The auto repair labor rates vary widely across the country, and even within the same city. Code P0128 is engaged specifically when the engine itself does not get to operating temperature in a specified time period. I read various DIY articles and glanced through Bentley. I replaced the thermostat and the repeating code cleared immediately. The engine control module (ECM, a type of computer) in the Wrangler keeps track of the engine and its sensors. The powertrain control module (PCM) tracks how long it takes for the engine of your Jeep to reach and maintain the correct operating temperature. Trouble code P0128 will also be recorded in the ECM ROM memory. posted on jan 06, 2010 It is triggered when your Jeep Wrangler‘s coolant temperature fails to reach the proper operating temperature.. It’s a generic powertrain code, which means that regardless of who manufactured the vehicle, it’ll have the same meaning (1996+). After proper installation, P0126 went away, but P0128 stuck around. Here are the symptoms associated with this trouble 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. Since a P0128 code is defined as Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature, many people automatically replace the thermostat. Within two days/twenty miles' worth of driving of picking up the car, the light came back on again. P0128 code. Air conditioning heater might not get hot enough because it uses the engine's coolant to warm up the vehicle's interior, and the coolant never reaches full operating temps. how to reset p0128 code, Trouble code P0128 will also be recorded in the ECM ROM memory. A bit of a PITA as everything on the Mini. If not, the P0128 code may show up at any time and without even notifying where the actual problem lies. How Do I Reset the Check Engine Light on a Dodge Grand Caravan? Engine will take too long to warm up (especially on cold days). I reset the code and it hasn't been back since. I have a P0128 code which won't clear. The code doesn't go off for a week after we reset. In other words, there is a problem with the engine operating temperature not being reached within a certain amount of time. answered Oct 29, 2013 by G37driver (3.5k points) You will either have to reset the code with an OBD-II reader or disconnect the battery for at least an hour or so. i used my actron cp9145 and read the p-code. It is triggered when your Chevy Silverado‘s coolant temperature fails to reach the proper operating temperature. This cools the engine excessively at times and causes the p0128 code. If you pinch your hose make sure that you are aware of the belted accessories and the fan. It can be really difficult to tell this in a vehicle that doesn’t have a temperature gauge. According to my research, 99% of the people who had this code needed to replace the thermostat. If it is easy to pinch the hose, typically water will be flowing through it. One most common mistake car owners and some mechanic make is to replace the coolant thermostat without running a full diagnosis of the problem and checking the entire car before assuming it is the coolant thermostat. Common mistakes when diagnosing the P0128 code. The cost to diagnose the P0128 code is 1.0 hour of labor. Final Talk. Speed was 58. The P0128 is for the Thermostat function. Ambient temp 34f. P0128 code definition. after each I tried to reset the code with my reader and it will not reset. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Code P0128. If you feel little to no heat from the heater, then it’s a pretty good indication that the thermostat is the problem, and not a wiring issue. P0128 Code- Replaced TSTAT and Coolant, Light is still on If this is your first visit, be sure to check out the FAQ by clicking the link above. after each I tried to reset the code with my reader and it will not reset. Low engine coolant can cause all sorts of problems in the cooling system. How To Diagnose And Repair Code P0128? It is not necessary to drain all the coolant despite what some writeups say. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. If there are no leak or any major problem in the system, usually the problem is the thermostat it self. It was an open t-stat. 2. check the operation of the thermostat it may be stuck open.3.inspect for low coolant level or for an incorrect coolant mixture. Just don't want to drive around waiting for it if it isn't going to clear and my cheap old code reader couldn't reset it. I have just purchased an 03 C230 1.8 L. I get the P0128 Eng temp low. When the correct engine operating temperature is reached, the powertrain control module orders the fuel system to … P0128 Causes: Chevy Silverado. You can reset your Jeep Wrangler's trouble codes right in your driveway if you have a socket set. Once the problem has been repaired, the code should either erase itself or be removed. Trouble code P0128 will also be recorded in the ECM ROM memory. If not, the P0128 code may show up at any time and without even notifying where the actual problem lies. He replaced the thermostat and coolant and reset the code to turn the the light off. simple repair, just a simple thermostat replacement.. An engine coolant temperature (ECT) sensor monitors the temperature of the coolant. Last time we reset we had a few days of extremely cold temps (-2) and it was good but then went off a week later again when temps were actually in the 30's. Air conditioning heater might not get hot enough because it uses the engine's coolant to warm up the vehicle's interior, and the coolant never reaches full operating temps. P0128 code definition. Took a few hours. Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) What the P0128 code means. The fan can come on at any time, 8L90E Specs, Performance, and Identification, TH400 Transmission Specs, ID, and Common Problems, Chevy S10 P0128: Coolant Thermostat – Below Temp, Chevy Sonic P0128: Coolant Thermostat – Below Temp, Chevy Impala: Brake Lights Stuck On → Diagnosis. Same code. Engine will take too long to warm up (especially on cold days). I replaced the thermostat. The two codes from the check engine light are: P0126 & P0128. Save Share. answered Oct 29, 2013 by G37driver (3.5k points) You will either have to reset the code with an OBD-II reader or disconnect the battery for at least an hour or so. What does the code P0125 mean? 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