P0401: Faulty EGR (Exhaust Gas Recirculation) valve. P0455, P0446, P0442, P0440, or P0411: Problem with the evaporative system. P0305 or P0300: Engine misfires. P0175 or P0171: Faulty oxygen sensor. While these are the most common codes that the 7E8 engine code menu shows, they aren’t the only ones that the menu can have.Feb 4, 2010 · Remove thermostats and verify proper operation. Bring to boil in a pot of water and see what temps they open and close at. Start opening ~ 160 Fully open at ~ 180 Degrees F roughly. Could also be a bad ECT Sensor. You can do a resistance check at various temps. At 0 degrees F Res = 9420 ohms At 50 degrees F Res = 973 ohms at 100 degrees F Res ...Mar 18, 2019 · P0158 is an OBDII code that occurs in many vehicles, including the Chevy Silverado. The code is triggered when: The voltage at the O2 sensor remains above threshold for 20 seconds or more. Voltage to the sensor is to high (wiring problem, think short) Bad O2 sensor itself. There are also some less likely problems that can cause P0158.2006 Chevrolet Silverado 1500 4.3 engine . I have codes p0200 and p0300 . Blinking check engine light . I just replace the spider injection assembly and I have the same code . I'm assuming it's a wiring issue at this point .P0128 Code - Coolant Thermostat Malfunction. How to Fix. Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins. ... P0128 Chevrolet Engine Coolant Temperature Below Thermostat …Code P0128 ( low coolant temp) 2001 chevy s10, I have changed the thermostat and temp sensor but gage still showing - Answered by a verified Chevy Mechanic. We use cookies to give you the best possible experience on our website. ... I have a 2006 LBZ Chevy Silverado crew-can lwb srw. Been having a P0128 coolant running to cool come up on many ...Suddenly engine idle speed increased and the transmission shifts erratically up and down on my 2002 Chev Silverado 4.8 engine. ... code P0128 coolant temp below thermostat regulating temp, ... 2004 CHEVY TRAILBLAZER KEEPS SURGING AND CUTTING OFF SOME TIMES HAD IT CHECKED AND IT HAS GOOD FUEL PRESSURE ,AIR INTAKE OK, ...Question about 2006 Chevrolet Silverado 1500HD. Open Question. 06 4.3l chevy silverado - P0128 code comes and goes - i have had it reset and then sometimes it resets itself - fluid level good and engine temp consistently runs at 185 - i have heard this is common for chevys - any suggestions.P1467 EVAP PURGE CANISTER VALVE SHORT 2020 CHEVROLET SILVERADOHow to fix a Chevy or GMC P0700 Code: Malfunction with Transmission Control Module (TCM). Some scan tools also give a Transmission Control System (MIL Reques...P0128 2016 Chevrolet Silverado - Código DTC de falla OBD2; P0128 Jeep - Código DTC de falla OBD2; P0128 Dodge - Código DTC de falla OBD2; ... Hay múltiples factores que pueden llevar a la detección de un código DTC P0128 Chevrolet en un vehículo de motor. Algunas causas pueden incluir: Termostato con fugas o atascado en posición abierta;The code P0128 - Coolant ... In many GM cars and trucks (Chevrolet Trailblazer, Silverado, HHR and other models) the code P0128 is often caused by a sticking thermostat. In some GM cars when the code P0128 is set, the temperature gauge stops working and the radiator fans run constantly. Replacing the thermostat often solves the problem unless ...Un «mal funcionamiento del termostato del refrigerante» es el tema del código de diagnóstico P0128. Para mantener la temperatura ideal del motor, el termostato del sistema de enfriamiento del motor debe funcionar correctamente, de acuerdo con este código.. El termostato es una parte que regula el flujo de refrigerante al motor, abriéndose y cerrándose a temperaturas específicas para ...P0128 Code Chevy Silverado. Check Details. P0134 code chevy silverado. Thermostat p0128 failed smog test temperature regulating coolant belowSilverado chevy p0446 p0455 system evaporative emission code control vent circuit leak mount motor bad evap detected large malfunction diagnosis Silverado p0449 evap solenoid canister solvedP0446 code 2014 ...Low coolant levels, a stuck engine coolant thermostat, and issues with the coolant temperature sensor or its wiring can cause code P0128. Symptoms of the P0128 code include an illuminated check engine light, longer warm-ups, and significantly decreased engine temperatures while driving on a highway. Contentshide.What do I have to do to fix the code P0128 - Cool - Answered by a verified Chevy Mechanic. ... Hello my name is ***** ***** I am working on a 2017 chevy silverado 1500 6.2l that has been running the engine cooling fan's on wide open I have replaced the coolant temp sensor with no change.Greetings viewers. In this video I dove into a 2014 Chevy Express with the 5.3L engine having a check engine light illuminated and stored codes P0172 and P01...The diagnostic trouble code (DTC) P2A04 indicates "O2 Sensor Circuit Range/Performance Bank 2 Sensor 2.". It applies to the downstream oxygen sensor on the same side of the engine bank that doesn't have the #1 cylinder. Also called post-catalytic converter O2 sensors, they measure the oxygen level in the exhaust gases that have been ...P0171and p0174 code can be caused by : The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.U0422: Invalid Data Received From Body Control Module set within the Power Steering Control Module. Some technicians may find that the steering gear has been previously replaced. Cause. This condition may be caused by the P111E diagnostic calibration inadvertently causing the DTC to set under certain ambient conditions.Nov 9, 2022 · ESTO NO LO SABIA !!! 🤔 CHEVROLET CODIGO P0128 SE CALIENTA SE APAGA EL A/C 2007 2008 2009 2010 Chevrolet Silverado muestra que se esta calentando en el table...P0128 equinoxP0118 chevy coolant buick Chevy express p0440 codeSilverado chevy code p0121 p0442 p0171 p0304 misfire trouble common relatively obdii somewhat has do. Chevy coolant blazer temp vortec v6 2005 1996 p0128Chevy express p0440: evaporative emission control system malfunction Repairing p0128 trouble codeFix code p0118 p0119 coolant ...P0128 Chevrolet Silverado. Check Details. P0455 chevy silverado trouble code. 2015 chevrolet silverado 2500 hd 4wd hostile hammered 20x10 -24P0128 coolant temp below thermostat regulating temp Chevy cruze code p0128 sonicSilverado chevy p0446 p0455 system evaporative emission code control vent circuit leak mount motor …05' Chevy Colorado LS Crew Cab. P0128: Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature. 99.5% of the time it is caused by the thermostat stuck open. Very common GM problem. Still getting this P0128 Engine Coolant Temp code. Cant identify if its the Sensor or the thermostat.44.5 in. Front Shoulder Room. 66.0 in. To help keep your vehicles — and your business — running smoothly, Chevrolet Business Elite Dealers offer a range of services like dedicated dealer representatives, work-ready loaner vehicles and extended service hours. Experience the 2024 Chevy Silverado 1500 pickup truck equipped with advanced ...If it continues it's most likely the thermostat sticking open and actually over-cooling the engine. That also triggers the fans https://youtu.be/aEfgkxWdBYw?...May 13, 2017 · tim.rohrer Discussion starter. 68 posts · Joined 2016. #1 · May 13, 2017. My 2012 LML threw a P0128 code this morning. Engine coolant level is fine. Live logging during a 20min test drive shows temps primarily in the 160s. High reached was 176. We kind of need to do a hour drive (not towing) shortly.Advice, how-to guides, and car care information featured on AutoZone.com and AutoZone Advice & How-To's are presented as helpful resources for general maintenance and automotive repairs from a general perspective only and should be used at your own risk. Information is accurate and true to the best of AutoZone's knowledge, however, there may be omissions, errors or mistakes.P0108 is a generic OBD-II trouble code. It indicates your Chevy Silverado's MAP (manifold absolute pressure) sensor's voltage reading is outside of the normal operating range. The voltage is too high. It's most commonly caused by a bad MAP sensor, wiring issue, or vacuum leak. The MAP sensor measures the air pressure coming into.2009 Chevy Silverado 4.3L - P0128 - Engine Temp/AC Off Warning comes on ... I drive an 01 chevy silverado ls 2wd with the 5.3. im having a bit of an engine temp problem. i drive all day and the engine will only get to around 170 degrees. which consequently set off my service ...19 Oct 2021 ... In today's video, I change out a bad thermostat in my Chevrolet Sonic LT 2015 1.8 vehicle. The OBD II Code that was thrown was P0128, ...1. Check For Other Codes. Additional codes can offer critical info about your Silverado’s condition. Rarely does P0175 Chevy show up alone (if it does look for a vacuum leak, bad O2 sensor, or dirty MAF).. 2. Spot The Weird Odor. While the engine operates, a strong gas smell could be coming from a leaky injector or a fault with fuel …Silverado chevy thermostat 2006 replace sensor temp coolant engine do cheverolet ectChevy cruze engine code p0128 sonic P0446 code 2014 chevy silverado. Check Details. Check Details. 2013 Fairway Metallic Chevrolet Silverado 1500 LT Crew Cab 4x4. Check Details.El código P0128 del Chevy Colorado es un diagnóstico de falla en el sistema de control del motor, también conocido como OBD-II. Este código significa que la temperatura del motor no alcanza el nivel de funcionamiento adecuado dentro de un lapso de tiempo determinado. ... ¡Tienes un Chevy Silverado y le has detectado el código P0455? ¡No ...Save over $500 doing it yourself . This is how i fix my check engine light for code p0128 which suggested i change the thermostats . My engine would not heat...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.P0128 is an extension of OBD-II code P0 which indicates a problem with your car's coolant thermostat. P0 codes are displayed as P0XXX, with the third numeral in the code sequence signifying ...How to fix a P0128 code and service engine soon light on GM vehicles. Since a P0128 code is defined as Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature, many people automatically replace the thermostat. It's not an expensive part, but it most likely won't fix the P0128 code and it will pop up again.Steering Message and Code- P0128 - Op Code for service 0401 and 4032680 Covered under 5 year/60k Miles Powertrain Warranty. Only 44k miles on 2019 Blazer. Will monitor and report back if any issues. ... Chevy Silverado EV Forum 2K+ members. Home. Forums. Chevy Blazer Complaints, Issues, Problems, Defects. 2019+ Chevy Blazer Complaints, Issues ...P0120 code is defined as “Throttle/Pedal Position Sensor ‘A’ Circuit.”. The powertrain control module (PCM) triggers this code when it detects abnormal voltage readings from one of your car’s throttle position (TP) or accelerator pedal position (APP) sensors. The P0120 code can be caused by either a faulty TP or APP sensor, damaged ...Today we have a 2019 Chevrolet Silverado with the 4.3 V6. It has a check engine light and the cooling fans would run for about 5 minuted after the vehicle as...In this video we'll be changing the coolant temperature sensor on my 2014 Chevrolet Silverado 5.3 V8 Lt.. this problem of it reading 160 as I'm on the highwa...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.P0174 is thrown when your carotruck's B2S1 O2 sensor detects the air-fuel mixture is "lean" (too much air or not enough fuel). Your Silverado's PCM will add more fuel to the mixture to bring the air-fuel mixture where it needs to be for optimal combustion. It also throws the code P0174 to let you know it has done this.Code P0128 2016 Chevrolet Silverado Description. The Engine Control Module monitors the temperature of the engine coolant for engine control and as enabling criteria for …My 2012 LML threw a P0128 code this morning. ... A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Come join the discussion about modifications, towing, classifieds, troubleshooting, maintenance, and more! ... Chevy Silverado EV Forum 2K+ members. Home. Forums. Chevy / GMC Duramax 11-16 LML Forums ...2009 Chevy Silverado 4.3L - P0128 - Engine Temp/AC Off Warning comes on - Scanner shows 140 deg but gauge reads 180 deg - Temp climbs normally as engine warms up but gauge reads 20-25 deg higher than scanner output until …2015 chevrolet silverado 2500 hd crew cab problems, online manuals and Silverado ld Chevy chevrolet silverado 2500 / 3500 service repair manual 2001-2005 2019 chevy silverado 1500 2500 3500 ... P0128 Code Toyota Camry. posts 13 Nov 2023. P0740 Jeep Wrangler. posts 25 Oct 2023. P0152 Jeep Wrangler. posts 29 Nov 2023. Plaza Chrysler Dodge Jeep ...P0108 is a generic OBD-II trouble code. It indicates your Chevy Silverado's MAP (manifold absolute pressure) sensor's voltage reading is outside of the normal operating range. The voltage is too high. It's most commonly caused by a bad MAP sensor, wiring issue, or vacuum leak. The MAP sensor measures the air pressure coming into.The P2176 code is related to the Throttle Actuator Control System. It indicates that the idle position is not learned. The Engine Control Module (ECM) monitors the throttle valve and the throttle position sensors. If both throttle position sensors were greater than a predetermined voltage during the minimum throttle learn procedure for more ...28 Jan 2024 ... DIY Fix – Fault Code P0128 (Coolant Temperature Below Thermostat Regulating Temperature) · Comments31.The P0128 code can also be triggered by malfunctions in the engine coolant temperature sensor or its circuit. If the sensor is sending incorrect readings to your engine control module, it may think that the engine is running at a lower temperature than it actually is. This can cause the P0128 code to be triggered.=====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code CHEVROLET P0053 Saving Re...The 2015 Chevy Silverado has a gross vehicle weight rating, or GVWR, of 9,500 lbs. This is the maximum operating weight as specified by the manufacturer. The gross value weight rat...a couple weeks ago I had code P0128 pop up, as well as the fans default on and the vehicle would not warm up. ... '23 Silverado LTZ 6.2 - '20 Traverse High Country AWD Ski Doo's - Boats - FLHR - Spyder F3S. Save Share. Like. A. ajparry89 Discussion ... Chevy Malibu Forum is the best place for owners of the sedan to connect with the community ...Use the FIXD Sensor and app to diagnose and fix P0172 yourself, see the most likely fix and cost for your car, access our Mechanic Hotline, and much more! Common Reason: Code P0172 is often related to a vacuum leak. Combustion engines run most efficiently when they maintain an air-fuel mixture ratio of 14.7 parts air to 1 part fuel.Chevrolet gallery: p015d chevrolet silverado Chevy silverado p0305: cylinder 5 Chevy silverado p0446 p0135 p0305 evaporative emission p0455 vent obdii detected fairly obd2 cylinder misfire evap. Chevrolet Gallery: P015d Chevrolet Silverado Silverado p0741 p0121 p0700 obdii somewhat 2013 chevrolet silverado 1500 ext. cab pickup truck in oklahoma ...The P2176 code is related to the Throttle Actuator Control System. It indicates that the idle position is not learned. The Engine Control Module (ECM) monitors the throttle valve and the throttle position sensors. If both throttle position sensors were greater than a predetermined voltage during the minimum throttle learn procedure for more ...The powertrain control module (PCM) is responsible for monitoring the reading of the air temperature entering the intake. The PCM looks for the 5-volt reading from the IAT sensor. If it comes back higher than that, the P0113 trouble code gets set in the computer. The PCM uses this measurement to adjust the fuel-air ratio.Silverado red rear brake drum calipers 1500 stop performance power brakes. How to replace rear brake pads & rotors 2002 chevrolet 2500 hd2007 chevy silverado 1500 rear brakes Brake wilwood rear calipers silverado truck chevy 2001 kit coated disc gmc powder brakes yukon gm h2 2500 1999 inchHow to replace rear calipers 1999-2007 chevy silverado 2500.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. It is common for most auto repair shops to charge between $75 and $150 per hour.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.A P1174 & P1175 trouble code means that your air to fuel ratio is either running too lean or too rich. Engines will have two banks. In traditional V-shaped engines, the 2-4 cylinders (depending on whether it is a V4 or V8, etc.) on the left side are considered “Bank 1” and the cylinder on the left are considered “Bank 2”.28 Sept 2022 ... How to Replace Thermostat 07-14 Chevrolet Suburban. 1A Auto: Repair Tips & Secrets Only Mechanics Know · 144K views ; DIY Fix – Fault Code P0128 ( ...P0128 equinoxP0118 chevy coolant buick Chevy express p0440 codeSilverado chevy code p0121 p0442 p0171 p0304 misfire trouble common relatively obdii somewhat has do. Chevy coolant blazer temp vortec v6 2005 1996 p0128Chevy express p0440: evaporative emission control system malfunction Repairing p0128 trouble codeFix code p0118 p0119 coolant ...Chevy reduced power mode, codes p0220, p2135 persistent and will notSilverado gmc z71 autotrader wt 2000 chevy silverado high rpm's code p0507P0446 code 2014 chevy silverado. Chevy p0507 code silverado 2000 rpmSilverado chevy code p0121 p0442 p0171 p0304 misfire trouble common relatively obdii somewhat has do Chevy silverado p0446 obdii code ...Hello my name is ***** ***** I am working on a 2017 chevy silverado 1500 6.2l that has been running the engine cooling fan's on wide open I have replaced the coolant temp sensor with no change. The codes on the truck before repair were engine codes- P0128, P0300, ABS Codes- U0401, Body Control Module codes- C0750, C0755 Chassis Control Module ...How to fix a Chevy or GM P0455 engine code: Evaporative Emission System Large Leak DetectedHow to Test a Purge Valve https://www.youtube.com/watch?v=5rQelbI...Service engine light was on. Pulled codes and discovered the "lean codes" P0171 and P0174, There was also a transmission related code, which was not unexpected. Next steps: Removed the transmission and took it for bench rebuild, flushed cooling lines and installed the rebuilt transmission with new torque converter. Cleared codes and road …The P0128 code is connected to the cooling system. After the driver starts the engine, the coolant should reach a temperature of 160° F in 15 minutes. Once it does, the coolant temperature sensor is there to keep the temperature above 160° F. If the coolant temperature doesn't reach that temperature, or it takes it too long, the P0128 ...Engine Temp Sensor Codes. If your Silverado's PCM doesn't know the engine temperature, it'll keep the fuel mixture rich. When this happens, the exhaust the O2 sensors see will be out of range, and it could throw P0430. You should see P0128 and (likely) P0420 along with this code. O2 Sensor Codes.Mar 3, 2022 · With a P0128 code, the first step is to get it properly diagnosed to figure out what is causing the malfunction in the coolant temperature circuit. Using the live data function of the FIXD sensor and app allows you to read and analyze engine temperatures to properly diagnose a P0128 code. >Click here to get FIXD for just $19.99 for a limited time!P0128 Definition: Coolant Temp - Below Thermostat Regulating Temp. The P0128 OBD-II trouble code is a generic powertrain diagnostic code (it has the same meaning for the Chevy S10 as any other vehicle). Coolant Temperature. The coolant temp sensor is responsible for telling the Engine Control Module (ECM) the engine's coolant temperature.When your check engine light illuminates due to a problem related to a P0128 code, the issue is most likely related to one of the following culprits: A stuck opened thermostat; A bad coolant temperature sensor; Malfunctioning wiring in the cooling system circuit A missing thermostat How do I know if it’s the P0128 code? Symptoms of the …Dec 17, 2019 · P0108 is a generic OBD-II trouble code. It indicates your Chevy Silverado's MAP (manifold absolute pressure) sensor's voltage reading is outside of the normal operating range. The voltage is too high. It's most commonly caused by a bad MAP sensor, wiring issue, or vacuum leak. The MAP sensor measures the air pressure coming into.Apr 13, 2012 · A P0128 means that it is taking too long for the coolant to come up to temp, not that it's not hot enough. Replace the thermostats and it will go away for good. This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.Check Details Tahoe chevrolet. P0449 chevy silveradoTrouble code p0101 Chevy p0507 code silverado 2000 rpmThe famous p0463. Tahoe ltz taupe gray 4x4 chevrolet metallic color ebony colors gtcarlot interiorI have a 2014 chevy silverado ltz crew cab with the 5.3. i currently Motor upgrades causing problems // 2004 chevy silverado build pt 102011 mocha steel metallic chevrolet tahoe ls #53327807.A P0128 means that it is taking too long for the coolant to come up to temp, not that it's not hot enough. ... 2006 K3500 Silverado, LBZ, 243K miles Raptor 150GPH lift pump and fuel lines, PPE race plug, Magnaflow cat-delete 4in exhaust, 42% over Industrial Inj.CP3, Rebuilt Injectors 30% over, 4094VVT stage 2 turbo, autometer gauges, EGR …44.5 in. Front Shoulder Room. 66.0 in. To help keep your vehicles — and your business — running smoothly, Chevrolet Business Elite Dealers offer a range of services like dedicated dealer representatives, work-ready loaner vehicles and extended service hours. Experience the 2024 Chevy Silverado 1500 pickup truck equipped with advanced ...4 Feb 2023 ... chevythermostat #thermostat #chevrolet #2014chevysilverado My truck stopped heating up like it should so I replaced my thermostat to fix the ...Jan 26, 2022 · Silverado 2017 engine running or engine off the radiator fan motor contnues running code P0128. engine coolant temperature ECT below threshold regulation. Silverado 2017 engine running or engine ...With a P0128 code, the first step is to get it properly diagnosed to figure out what is causing the malfunction in the coolant temperature circuit. Using the live data function of the FIXD sensor and app allows you to read and analyze engine temperatures to properly diagnose a P0128 code. >Click here to get FIXD for just $19.99 for a limited time!Dec 28, 2019 · To date, I have done the following; - Check coolant level. - Checked mass airflow sensor (MAF) by swapping it with my work truck MAF; nothing changed. - Checked ECM relay. - Checked J-Case fuses for cooling fan 1 & 2. - Changed temperature sensor. - Changed thermostat (replaced coolant as well) - Connected a code reader, no codes identified.Code P0300 Chevrolet Description. A misfiring cylinder causes slight variations in the rotational speed of the crankshaft. The Engine Control Module ( ECM) is able to detect these variations by closely monitoring the crankshaft position sensor signal. The signals of the camshaft position sensors are used to determine which cylinder is misfiring.The P0123 trouble code indicates that the Engine Control Module (ECM) or Powertra, P0128 Chevrolet Silverado. Fix code p0126 p0128 chevrolet cruze chevy sonic. engine, Severity & Symptoms. Since a P2A01 code means that the downstream O2 sensor has faile, =====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈=====Engine Code CHEVR, 1999-2006 chevrolet silverado 1500 ss rear step bumper ss chromeSilverado ss rear bumper 2003-07 chevy silverado, Fpcm p0172 chevy truck p0174 P0332-code-chevy-silver, Aug 29, 2022 · The best way to fix P0128 is to find the root cause of the problem and repair it. A, 2015 chevrolet silverado 2500 hd crew cab problems, online manuals an, DTC P0128 Diagnostic Instructions. ... A forum community dedicated , Bought new. 25,700 miles. Hello, looking for help troubleshooting a, =====Claim your FREE engine code eraser 👉 https://free.nonda, 2015 Chevy Silverado 1500 Code P0128. Author Prof. , It’s official: a fully electric Chevy Corvette is coming — with new ba, Por lo tanto, es importante revisar y reemplazar el sensor de temperat, How to replace both thermostats on 2008 GMC 2500HD 6.6L Duramax Diesel, P0128 Chevrolet Silverado. Fix code p0126 p0128 chevrolet c, Threw code P0128 2 months ago, indicating possible stuck-open thermo, It almost goes without saying that checking and changi.