P0128 chevy malibu

P0128 is a diagnostic trouble code (DTC) for "Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation.

To set the timer on a Malibu Lighting transformer, users should first turn the dial until the arrow lines up with the correct current time, then set the green tripper at the time they want the lights to turn on and the red tripper to the ti...Codburt1214 Discussion starter · Oct 27, 2020 (Edited) My car 2004 chevy malibu v6 ls was throwing the p0128 code and thats the inly code it shows its been running with no issues i started the car the other day and it ran for about a minute and died (in cold temps) it wouldnt start back up. Went back later and it started for another minute and ...0:00 / 12:53 2008-2012 Chevy Malibu Thermostat Replacement P0128 Rodriguez Repairs 3.18K subscribers Subscribe 444 37K views 1 year ago Hey everyone! Replacing the thermostat on a Chevy 2.4L...Code P0651 sets if the PCM detects a potential issue with its 5-volt reference signal. If the PCM discovers a potential problem with this reference signal or if it doesn’t receive an input signal from one of the engine sensors, it will set the P0651 code.What Does Chevrolet Malibu Code P0014 Mean? Chevrolet Malibu P0014 definition: Exhaust Camshaft Timing- Over-Advanced Bank 1 Issue Severity: SEVERE – Stop driving immediately. Repair Urgency: Fix this code immediately (same-day if possible) to avoid damage to multiple internal engine components. Diagnosis: This trouble code severely impacts the drivability of your vehicle. The most common […]

March 14, 2022 Advertiser Disclosure TABLE OF CONTENTS What Does Code P0128 Mean? P0128 Causes P0128 Symptoms How Do I Fix Code P0128? How Much Does It Cost to Fix Code P0128? DIY Steps to Diagnose Code P0128 Still Need Help Fixing Code P0128? Fixed It But The Check Engine Light Is Still On? Diagnose & fix your check engine light! GET FIXDWhat happens is the vehicle will set a p0128 fault code. This fault code sets when the engine takes too long to reach operating temperature. ... 2009 Chevy Silverado 4.3L - P0128 - Engine Temp/AC Off Warning comes on - …Ahora que conoces los diferentes pasos para solucionar el famoso código P0128 del Chevy Malibu, ¡es hora de ponerse manos a la obra! ¡Recuerda que el mantenimiento preventivo es importante para mantener tu automóvil en buen estado! Diagnosis: It is important to complete the entire diagnostic process when diagnosing the P0128 code. This DTC can be triggered by a missing or stuck open thermostat, a faulty coolant temp sensor, or damaged wiring to the coolant temp sensor circuit. Use the FIXD Sensor and app to diagnose your P0128 at home, access our Mechanic Hotline, see the ...Apr 1, 2008 · Original Question on justanswer: Chevrolet Malibu Maxx LS giving ODBII code P0128. I know what the code is, but not sure how to pinpoint the actual problem. Origianl Answer on justanswer: The code is basically saying that the engine coolant is not getting up to temp. If the gauge says the temp is up to operating temp then the most likely ... What does this mean? What are the Possible Causes of the DTC P0128 Chevrolet? NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes. Leaking or stuck open thermostat Low engine coolant level Insufficient warm-up time Faulty Engine Coolant Temperature (ECT) sensor What Does Chevrolet Malibu Code P0014 Mean? Chevrolet Malibu P0014 definition: Exhaust Camshaft Timing- Over-Advanced Bank 1 Issue Severity: SEVERE – Stop driving immediately. Repair Urgency: Fix this code immediately (same-day if possible) to avoid damage to multiple internal engine components. Diagnosis: This trouble code severely impacts the drivability of your vehicle. The most common […]Oct 24, 2018 · Te suministramos todo lo que necesitas saber sobre el código DTC P0128 ️ Descripción, ️ causas, ️ síntomas y ️ posibles soluciones.LEER SOLUCIÓN DEL CÓDI...

OBD P0128 Chevrolet Malibu code and tailpipe testing are two different approaches to identify vehicles in need of repair. The OBD system looks for broken or malfunctioning emissions control components and P0128, while tailpipe tests sample a vehicle's exhaust to see if it is above or below certain prescribed limits.Codburt1214 Discussion starter · Oct 27, 2020 (Edited) My car 2004 chevy malibu v6 ls was throwing the p0128 code and thats the inly code it shows its been running with no issues i started the car the other day and it ran for about a minute and died (in cold temps) it wouldnt start back up. Went back later and it started for another minute and ...Lowering the gas tank on a Chevy Malibu is necessary in order to replace the gas tank, of course, but it's also required if you want to replace the fuel pump or repair the fuel gauge sending unit. The tank itself is not very heavy once you ...Apr 21, 2020 · That code is for a low temperature reading. P0128 CHEVROLET 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.

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The P0128 OBD II trouble code indicates that your Chevy Malibu's engine coolant temperature has not reached its required operating temperature within a certain amount of time after starting the car. This code can appear as soon as you start your vehicle, or it can also occur while driving.The P0449 code is, in most cases, caused by a faulty EVAP vent valve or the wirings to it. However, depending on the car model, it could also be caused by other issues related to the EVAP system. The causes of the P0449 trouble code range from simple to more complex. For this reason, it’s important to follow the diagnostic steps we provide ...Chevrolet P0420 definition : Catalyst system efficiency below threshold (Bank 1) Issue Severity: MODERATE – Extended driving with this code can cause internal engine damage. Repair Urgency: Get this code fixed as soon as possible to avoid further damage to your emission system and possible engine damage. Diagnosis: The most …When your check engine light is illuminated due to trouble code P0128, you may have an issue with your engine thermostat. Here are some helpful steps to take to find out how do I fix trouble code P0128? Learn how to solve this trouble code and repair your thermostat. What Is Trouble Code P0128? Common Symptoms Likely Causes How to Fix P0128=====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code P0597 Saving Repair Parts...Code p0128 Chevy cavalier code - Cars & Trucks. Posted by Luis Turcios on Dec 18, 2016. Want Answer 1. Clicking this will make more experts see the question and we will remind you when it gets answered. ... My 05 Chevy Malibu (3.5 v6) is running really rough. It’s vibrating so much that Walmart refused to do an oil change. The engine light ...

A week later this original code (P0128) came back on and the check engine light too. Same routine, a.c. off engine too hot despite being 50 degrees out. Coolant level about half. Thought better of filling but at this point willing to try anything. Still love and promote Chevy though.P0128 CHEVROLET code possible causes. Leaking or stuck open thermostat; Low engine coolant level; Insufficient warm-up time; Faulty Engine Coolant Temperature (ECT) sensor; Engine Coolant Temperature sensor harness is open or shorted; Engine Coolant Temperature sensor electrical circuit poor connectionThis video shows the replacement of a thermostat and seal on a 2010 Chevy Malibu with a 2.4L engine.I have a 2001 Chevy Malibu with the 3100 c.i motor.. The check engine light came on and Temperature gauge wasn't working . The code came up P0128. I have replaced the coolant temp sensor. Erased the code and every is fine for a few weeks then the check engine light comes back on with the same...OBD2 Code P0116 Chevrolet definition: The ECT (Engine coolant temperature) sensor is a thermistor which changes resistance based on temperature of the coolant in contact with it. The ECT sensor will be located in the block or coolant passage. Usually it is a two wire sensor. P0010 definition: Intake Camshaft Actuator Circuit Open/Short (Bank 1) Issue Severity: MODERATE – Extended driving with this code may cause internal engine damage. Repair Urgency: Get this code fixed as soon as possible to avoid loss of power, fuel economy, and damage to your emission system. Diagnosis: This trouble code will not prevent your ...The first and most common cause for the P0128 code is a faulty thermostat. The thermostat can get stuck in an open position, preventing the coolant from ever reaching the optimal operating temperature. However, you should check the coolant level first as it can also trigger the P0128 fault code. While you’re at it, make sure that your car is ...15 Des 2010 ... I got it tested at auto zone and it was code po128, running at lower temperature than normal etc, check coolant level, engine coolant temperate ...Oct 22, 2019 · P0128 CHEVROLET 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. Sensor can be erratic. Lack of heat – The most prominent symptom of the P0128 trouble code in the Chevy S10 is the lack of heat. When the thermostat doesn’t bring the engine up to the proper operating temp, it means that the coolant going through the heater core isn’t as hot. This leads to less/no heat. If you feel your truck’s heater working better when ...Sep 2, 2013 · P0128 sets when the minimum coolant temperature of 176 degrees is not attained within the specified engine run time, vehicle speed and distance traveled and accumulated engine air flow as determined by the MAF sensor. You replaced the thermostat which normally is the cause, the ECT sensor will usually set a different code if it's bad.

CODE P0126 P0128 ENGINE LIGHT ON FIX CHEVROLET, CHEVY, GMC, BUICK, CADILLAC Great Car Scanner: https://amzn.to/2QmNBri Check out our Amazon Store for the t...

P0128 Chevy. A stuck thermostat is a common source of the code P0128 in many GM cars and trucks. This is applicable to models including the Chevrolet Trailblazer, Silverado, and HHR. ... These include the 2006 Chevrolet Malibu, Impala, Pontiac G6, and a few more cars according to the GM TSB dated 2007.Lack of heat – The most prominent symptom of the P0128 trouble code in the Chevy S10 is the lack of heat. When the thermostat doesn’t bring the engine up to the proper operating temp, it means that the coolant going through the heater core isn’t as hot. This leads to less/no heat. If you feel your truck’s heater working better when ...RADIATOR FAN STAYS ON ALL THE TIME CHEVY, CHEVROLET, GMC, BUICK, CADILLAC Car Scanner: https://amzn.to/2G5lxTi Check out our Amazon Store for the tools and...También te puede interesar Código P0301. Causas, Síntomas y Cómo Diagnosticarlo. 2. El nivel de refrigerante. El nivel de refrigerante puede activar el código de falla P0128. Si el nivel es muy bajo, pueden crearse “vacíos” en el circuito de refrigerante, que dan una mala señal de temperatura, activando el código P0128.P2635 is a diagnostic trouble code (DTC) for "Fuel Pump ‘A’ Low Flow / Performance". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $154.99 .The P0128 OBD II trouble code indicates that your Chevy Malibu's engine coolant temperature has not reached its required operating temperature within a certain ...When it comes to making repairs associated with the Chevrolet P0171 code, one or more of the below repairs may be needed to solve the underlying issue causing bank 1 to run lean. For each possible repair, the estimated cost of repair includes the cost of the relevant parts and the cost of labor required to make the repair. Vacuum leak $100-$200the gauge "Sometimes works", intermittent operation. Rarely works when temp is below about 40 degrees F. Works 50-60% (optimistically, lol) of the time when temp is above 40F. When working, it reads normal operating temp, rising after the car has been running a few minutes, then flattening off around 210.Check your coolant level. A P0128 is an insufficient coolant temperature code. If the the coolant level is OK, replace the thermostat. The P0826 code is for the up shift down shift command for the buttons on the shift lever.Nov 6, 2018 · Fixing P0128 in the Chevy Sonic is usually a pretty easy thing to do since, 90% of the time, a stuck thermostat will cause the problem. Here are the most common causes of P0128: Thermostat Stuck Open – Far and away, the most typical cause for the P0128 code is a thermostat that is stuck open. When a thermostat is stuck open, it allows coolant ...

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Fixing P0128 in the Chevy Sonic is usually a pretty easy thing to do since, 90% of the time, a stuck thermostat will cause the problem. Here are the most common causes of P0128: Thermostat Stuck Open – Far and away, the most typical cause for the P0128 code is a thermostat that is stuck open. When a thermostat is stuck open, it allows coolant ...SOURCE: Check light on Chevy Malibu 2002. P0128 - Coolant Thermostat Below Thermostat Regulating Temperature REPLACE THE THERMOSTAT THE ENGINE IS NOT REACHING CORRECT OPERATING TEMPERATURE, 190-195 DEGREE'S FAHRENHEIT. Posted on Feb 19, 2009 A P0073 code is fairly easy to diagnose on average. Most of the time, it’s because of a damaged or corroded sensor connection. Oftentimes, you only have to look at the sensor connections to see ...howie6907 · #12 · Nov 18, 2014. I have a 2004 malibu LT V6 with 50,000 K. Got the check engine warning and when I scanned got the P0128 warning. Are you suggesting to replace the thermostat first (most likely) and sensor second. If I have to drain to replace the thermostat and sensor should I just replace both parts.Marián Šuch. Klinika Bioharmonia - MUDr. Marián Šuch. Objednať sa online. Adresa: Kazanská 50 - 821 06, Podunajské Biskupice (Bratislava) - Bratislava. Telefón: +421 2 …Mar 3, 2022 · Diagnosis: It is important to complete the entire diagnostic process when diagnosing the P0128 code. This DTC can be triggered by a missing or stuck open thermostat, a faulty coolant temp sensor, or damaged wiring to the coolant temp sensor circuit. Use the FIXD Sensor and app to diagnose your P0128 at home, access our Mechanic Hotline, see the ... 0:00 / 12:53 2008-2012 Chevy Malibu Thermostat Replacement P0128 Rodriguez Repairs 3.18K subscribers Subscribe 444 37K views 1 year ago Hey everyone! Replacing the thermostat on a Chevy 2.4L...The Chevy Malibu P0128 code is letting You know that Your coolant thermostat temperature is below the regulating temperature for optimal efficiency. There could be many causes for this such as a faulty or stuck thermostat, bad coolant temp sensor, and a radiator fan that does not turn off. The likely issue is the thermostat and is what most ... ….

The best years of the Chevrolet Malibu are: 2021, 2017-2019, 2014-2015, 2012-2013, 2010-2011, 2008, and 2006. The years you should absolutely avoid are: 2007, 2004-2005, 2001-2003, 2009, 2016, and 2020. Most issues are related to the engine, specifically the variable valve timing system. Niel Stender. May 15, 2023.Generic Diagnostic Trouble Code (DTC) P0299 indicates an underboost condition regarding your car. Join us as we define the code, discuss its severity, and provide solutions.A week later this original code (P0128) came back on and the check engine light too. Same routine, a.c. off engine too hot despite being 50 degrees out. Coolant level about half. Thought better of filling but at this point willing to try anything. Still love and promote Chevy though.Jan 4, 2012 · A code P0128 may mean that one or more of the following has happened: Low engine coolant level. Leaking or stuck open thermostat. Faulty cooling fan (running too much) Faulty coolant temperature sensor ECT. Faulty intake air temperature (IAT) sensor. Possible Solutions Past experience indicates that the most likely solution is to replace the ... Labor: 1.0. To diagnose the P0973 Chevrolet code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.Chevrolet is an American icon, known for the Camaro, Corvette, Malibu, Impala and more. Take this quiz to see if you can recognize the most memorable '70s Chevys! Advertisement Advertisement Can you tell the difference between a Camaro and ...Nov 6, 2018 · The P0128 OBD II trouble code indicates that your Chevy Malibu’s engine coolant temperature has not reached its required operating temperature within a certain amount of time after starting the car. This code can appear as soon as you start your vehicle, or it can also occur while driving. Mar 3, 2022 · Diagnosis: It is important to complete the entire diagnostic process when diagnosing the P0128 code. This DTC can be triggered by a missing or stuck open thermostat, a faulty coolant temp sensor, or damaged wiring to the coolant temp sensor circuit. Use the FIXD Sensor and app to diagnose your P0128 at home, access our Mechanic Hotline, see the ... Oct 24, 2018 · Te suministramos todo lo que necesitas saber sobre el código DTC P0128 ️ Descripción, ️ causas, ️ síntomas y ️ posibles soluciones.LEER SOLUCIÓN DEL CÓDI... P0128 chevy malibu, The P0128 fault code is a pretty common one, and there are a couple of things that cause it. If you’re dealing with a P0128 code, make sure to inspect the following things components. The first and most common cause for the P0128 code is a faulty thermostat. The thermostat can get stuck in an open position, preventing the coolant …, The OBD-II code P0480 registers when the vehicle’s powertrain control module (PCM) detects a potential problem with the engine’s electric cooling fan or its control circuit. This guide will help you learn more about this code and explain why you need to get to the bottom of the issue immediately., Check light on Chevy Malibu 2002 P0128 - Coolant Thermostat Below Thermostat Regulating Temperature REPLACE THE THERMOSTAT THE ENGINE IS NOT REACHING CORRECT OPERATING TEMPERATURE , 190-195 DEGREE'S FAHRENHEIT ., Unsolved. Driveability. 2011 Chevrolet Malibu LS 2.4L (1 LE5) 6-spd (6T40) P0128 — Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature), Coolant Fan. Good afternoon everyone, have a 2011 chevy malibu 2.4 with a p0128 code, this car belongs to a friend of my daughter, she had it at another facility and said that a ..., 06 4.3l chevy silverado - P0128 code comes and goes - i have had it reset and then sometimes it resets itself - - Chevrolet 2006 Silverado 1500HD question. ... Sep 08, 2009 • 2006 Chevrolet Malibu. 0 helpful. 1 answer. My 2003 chevy trailblazer keeps throwing code. change thermostat Read full answer., P0121. P0130. P0234. P0403. Význam chybového kódu P0128 je: Teplota chladicí kapaliny pod regulační teplotou termostatu. Zjisti, co to přesně znamená, příznaky a příčiny kódu …, What is the Cost to Diagnose the Code P0128 2014 Chevrolet Silverado? Labor: 1.0. To diagnose the P0128 2014 Chevrolet Silverado code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type., Fixing P0128 in the Chevy Silverado is usually a pretty easy thing to do since, 90% of the time, a stuck thermostat will cause the problem. Here are the most common causes of P0128: Thermostat Stuck Open – Far and away, the most typical cause for the P0128 code is a thermostat that is stuck open. When a thermostat is stuck open, it allows ..., If code P0128 is stored for a long period without being fixed, can it cause the sec air inj pump to - Chevrolet 2006 Cobalt question. Search Fixya ... Sep 08, 2009 • 2006 Chevrolet Malibu. 0 helpful. 1 answer. P0410 Secondary …, Codburt1214 Discussion starter · Oct 27, 2020 (Edited) My car 2004 chevy malibu v6 ls was throwing the p0128 code and thats the inly code it shows its been running with no issues i started the car the other day and it ran for about a minute and died (in cold temps) it wouldnt start back up. Went back later and it started for another minute and ..., SOURCE: cooling fans on 2001 chevy malibu will not come on unless ac on. the relays control circuit is grounded by ECM (computer) . to check this make sure the is hot enough for the fans to be commanded on by computer and check to see if you have voltage at relay and it has ground from computer . you may need ECM. good luck . Posted on …, Code P0651 sets if the PCM detects a potential issue with its 5-volt reference signal. If the PCM discovers a potential problem with this reference signal or if it doesn’t receive an input signal from one of the engine sensors, it will set the P0651 code., Mar 14, 2022 · What Does Code P0128 Mean? GM P0128 definition: Coolant Thermostat Temperature Below Regulating Temperature. Issue Severity: LOW– Continued driving for a short period of time is okay. Repair Urgency: Get this code fixed withing the next month to prevent the potential for overheating. Diagnosis: It is important to complete the entire ... , I would like to know where the coolant thermostat (p0128) is on a 2006 chevy malibu. Submitted: 12 years ago. Category: Chevy. Show More. Show Less. Ask Your Own Chevy Question. Share this conversation. …, Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST. P0480 code definition P0480 is a general OBD2 trouble code that refers to the a malfunction within the cooling fan control circuit. This code is similar to P0481 and P0482 codes. What the P0480 code means P0480 means that the..., What does this mean? What are the Possible Causes of the DTC P0128 Chevrolet? NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes. Leaking or stuck open thermostat Low engine coolant level Insufficient warm-up time Faulty Engine Coolant Temperature (ECT) sensor, 599 Answers. SOURCE: 2005 inline 4.2 trailblazer P0128 and P0304 can. PO128 is coolant thermostat (coolant temperature below thermostat regulating temperature). check the coolant level first. PO 304 is a misfire in the number 4 cylinder. hope this helps if you need more help get back to me, please rate my fix as i strive to be the best Thanks Ray., May 11, 2023 · To diagnose the P0128 Chevrolet code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour. , Original Question on justanswer: Chevrolet Malibu Maxx LS giving ODBII code P0128. I know what the code is, but not sure how to pinpoint the actual problem. Origianl Answer on justanswer: The code is basically saying that the engine coolant is not getting up to temp. If the gauge says the temp is up to operating temp then the most …, P0660 is the trouble code identified as "Intake Manifold Tuning Valve Control Circuit/Open Bank 1" and this indicates a general electrical fault or open electrical situation that has been detected by the ECM on bank #1. On multiple bank engines (e.g. V6, V8) bank #1 is the side of the engine that contains cylinder #1., **Check out the tools we used below. If the video was helpful, please give it a "thumbs up" and consider subscribing to the channel.**This is how to do coola..., 2002 chevy blazer 6 cyl, 4.3 engine, emissions inspection turned up two codes: P0101 and P0128. Runs fine, cleaned maf sensor and changed air filter, still getting codes. Are they related and tied into the..., P0128 Chevy: Wrap Up. To summarize, the P0128 code in Chevy translates to “Coolant Thermostat Temperature Below Regulating Temperature.”. This code means that your coolant is taking too long, or isn’t reaching the minimum operating temperature altogether. It should reach 160º F after 15 minutes., Sep 2, 2013 · P0128 sets when the minimum coolant temperature of 176 degrees is not attained within the specified engine run time, vehicle speed and distance traveled and accumulated engine air flow as determined by the MAF sensor. You replaced the thermostat which normally is the cause, the ECT sensor will usually set a different code if it's bad. , 2015 Chevy Cruze with P0128 code. Replaced water pump, thermostat, ... Chevrolet Malibu Maxx LS: P0128..pinpoint..theenginecoolant. Original Question on justanswer: Chevrolet Malibu Maxx LS giving ODBII code P0128. I know what the code is, but not sure how to pinpoint the actual problem., P0128 and U0401 Set Brand: Model: Model Year: VIN: Engine: Transmission:Brand: Model: from to from to Engine: Transmission: Cadillac XT5 2017 2017 LGX GMC Acadia (VIN N) 2017 2017 Involved Region or Country North America and N.A. Export Regions Condition Some customers may comment on the Steering Assist Reduced, Drive With Care …, 2001 chevy malibu 3.1 no ck engine light,temp gauge not working history codes P0128 fans on all the time with engine running scanner show engine temp … read more GM Tech (Cam), Fixing P0128 in the Chevy Cruze is usually a pretty easy thing to do since, 90% of the time, a stuck thermostat will cause the problem. Here are the most common causes of P0128: Thermostat Stuck Open – Far and away, the most typical cause for the P0128 code is a thermostat that is stuck open. When a thermostat is stuck open, it allows coolant ..., SOURCE: Check light on Chevy Malibu 2002. P0128 - Coolant Thermostat Below Thermostat Regulating Temperature REPLACE THE THERMOSTAT THE ENGINE IS NOT REACHING CORRECT OPERATING TEMPERATURE, 190-195 DEGREE'S FAHRENHEIT. Posted on Feb 19, 2009 , P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) P0300 - Random/Multiple Cylinder Misfire Detected. P0420 - Catalyst System Efficiency Below Threshold Bank 1., May 30, 2016 · Codes Related to P0128. P0128 code is closely related to P0125 “insufficient coolant temperature for closed loop fuel control.” The only difference is that P0125 indicates the engine has not reached sufficient temperature to enter closed loop (PCM feedback control of the onboard system). , P0128 CHEVROLET code possible causes. Leaking or stuck open thermostat; Low engine coolant level; Insufficient warm-up time; Faulty Engine Coolant Temperature (ECT) sensor; Engine Coolant Temperature sensor harness is open or shorted; Engine Coolant Temperature sensor electrical circuit poor connection, 2007 Chevy Cobalt with p0128 and "---" temp reading. I have a 2007 Chevy Cobalt that has been throwing a p0128 code recently couple with the fact that when it does the engine temp readout on the DIC reads "---" instead of a temp. I was told that the most likely culprit was the engine temp sensor (coolant sensor) which I had replaced a month ago ...