How to Fix P0128 Engine Code in 3 Minutes [2 DIY Methods / Only $7.34]

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Engine Code P0128 Saving Repair Parts:

This video shows you How to Fix Engine Code P0128 in the easiest, quickest, and cheapest way. 2 practical solutions to fix the P0128 error code. 2 simple DIY solutions to repair P0128.

Engine Code P0128: Coolant Thermostat Malfunction. his means that after starting the engine the powertrain control module has detected that the engine has not reached the required temperature level within a specified amount of time. How to inspect the ECT Sensor. How to replace the ECT sensor. How to Use a Multimeter. coolant temperature sensor. engine coolant temperature sensor. Jiggle Valve. How to replace the thermostat. Tips and tricks for replacing the Thermostat in your car and fixing code P0128.

Fix Engine Code P0128 Easy DIY Method A | The ECT sensor
1. Inspect the ECT Sensor
2. Replace the ECT Sensor

Fix Engine Code P0128 Easy DIY Method B | The Thermostat
1. Remove the Used Thermostat
2. Install a new Thermostat

Related Codes and Their Repairing Methods:

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0:00 What is P0128
0:34 Method A - The ECT Sensor
1:12 Method B - The Thermostat
1:52 Claim a FREE Engine Code Eraser

[nondainc]

Hi, I'm Steve, nonda's lead mechanic engineer.
Feel free to leave your comments here if you have any mechanic questions, I will be glad to help you out!

[hansanderson]

I had a P0128 trouble code in a 2002 V6 (3.8L) Camaro. No leaks, had heat in the passenger
compartment, but the temp gauge wouldn't move from "cold", and the cooling fans were
running on "high", even when the engine was cold (below freezing). Replaced the ECT sensor,
did not fix the problem. Replaced the thermostat, cleared the trouble code, after 2 miles,
the temp gauge was working normally, the fans stopped spinning on the radiator, and the
car ran smoother. Put the "bad" thermostat in some boiling water, it opened just as it
should have, and closed when I dropped it in some cold water. One thing though, when I
pulled the old thermostat out, the jiggle valve was not in the "up" position, it was in the
"3 o'clock" position, so perhaps that was the cause of my problem. Engine only had
59, 000 miles on it, and the thermostat wasn't "dirty" at all.

[garywinthorpe]

Love the video!!! but hard to watch because that alarm sound gives me ptsd from mornings😂

[alejandronava]

Good morning Steve I have a p0128 code, I bought the car off my neighbor he had replace the thermostat and hoses as most people do. Car ran fine then I got and secondary 02 code, fixed the issue then the p0128 came back, using logic it can be assumed that the ECT can be the cause

[Hoss]

Hey Steve I got a Honda civic 2012 and it’s throwing this code. Replaced thermostat but not thermostat housing. I have a metal housing and I really don’t think that’s the problem like some videos say. I see a lot of people changing out their housing because it’s rubber or plastic which makes sense. Anyways I also changes ECT Sensor and the car still runs like crap. I’ve heard of “Flashing your car and making sure no air is in the cooling system witch is what I’m going to try next.

[gursewaksandhu]

Hi steve, your videos are very helpful. I have acura RL 2005 and it’s showing code P2183, P0128, P 0111 and P 1717. I’m bit confused that the fault is in censor 2 or thermostat pls help me. Thank you

[AndrewPardee-sbnw]

I put in a180 thermostat program fans to come on at 185. Throws 128 code. About every other time, when the gets to 185

[jamesward]

Replace the cap. Got to have 20 psi to get the right temperature. Less pressure means lower temperature.

[onlyme]

2018 Elantra 2.0 random p0128 shop said to replace thermostat housing with thermostat built in. Did that in November 2023. In January 2024 it came back and got a replacement u der warranty. Now its April and its happening again this time i saw a smal stream of fluid as i drove off on my drieway. The drip pan under the engine bay is wet but can't find where the fluid came from i get heat still and used the torque app and temp shows 199. And these factory ones are 212 boiling point thermostat. Not sure what to do. Are these just junk thermostats or is the ecu or pcm needing some dealer update? Any thoughts or alternative solutions please share.

[armandolfo]

Greetings friend. I see that my 2002 Chevrolet Tracker 2.0 or what would be the Suzuki Vitara does not reach the temperature, so I might think that it does not have a thermostat. I connected a scanner to it and performed a real-time analysis and the temperature varies between 50 and 77 °C, that is, it can be at 77 then it goes down to 65 then it goes up to 70 and then it goes down to 55 and so on. Do you think the fault could be that the coolant temperature sensor is damaged? The scanner marks the code P0128, P0113 and also P0335 of the CKP sensor. According to two mechanics who reviewed it, they say that this CKP code is normal for this vehicle, but for me what doesn't work is them because it can't be normal. The IAC valve was also changed but it is a compatible generic one.
Anyway, if you can help me, I would greatly appreciate it because when the car is hot it shakes and the revolutions drop, and it also uses too much gasoline.
Thank you very much and excuse my English, I really speak Spanish and I used the translator.

[damienc]

Very easy to follow video...nice job 🤙

[autoexcellence]

Love from Pakistan..
Thanks for sharing

[jeremymartin]

Hey Steve. I have a 2016 Kia Optima. I recently changed my oil on my car and the following day I noticed the engine light was on. Came up as code P0128. I have noticed little to no changes though. Car gets to normal temperature, heat works like normal, coolant levels are good. I’ve noticed an occasional white smoke from the back even when car is at running temperature. Any advice?? Thoughts on what I should do or check?

[barknbars]

Hi Steve, I have a 2016 BMW 228i Xdrive and recently after getting my housing valve cover gaskets replaced by a bad mechanic my car got a U1408 and P0128 Codes right after they deliver me the car. By any chance do you know what might be the fix or the issue is? Thanks a lot!

[udaykanth]

I have the issue with my Mini Cooper 2013. Just 1 day ago, one bad mechanic fixed my brakes. I am getting an error like an engine check. I went to O'Reilly to check why the engine light is on . So i got two error codes 1.P173B
And 2.P0128
Even while my fan is not shutting off for 10mins even though I turned off my engine 🙃
any leads or suggestions please

[G-Malo]

I have P0128 in my 2014 Dodge Caravan. I replaced the coolant sensor and Thermostat and still have the error code. Any ideas?

[zachjansheski]

I have a 6.6 lbz duramax 280k with egr intact oem. I am puking coolant… my temp stays at 160 for 20 minutes then spikes to 240. For 10 seconds then drops to 180.. low coolant light pops on. Then sits at 190. Which is operating temp. I have heat the whole time and no loss of power or smoke. No coolant in oil.. it’s a diesel.. I haven’t changed thermostats yet. The mechanic I brought it to 3 years ago found a crack in my housing I think he re used old t stats

[robertokristen]

if this engine check light code was not repaired for long time, what will happen ?
i hear loud noise after 20 - 30 min of driving which is increased with pushing on accelerator !!! is it related to unrepaired coolant thermostat ?

[johntrovy]

Hey Man. Very nice and informative video. I got code P0128 on my 2010 ML550. Want to check coolant temp sensor before going to thermostat. Would u mind posting the video from very beginning till u get to sensor? Want to locate the sensor in my ML550? Or if u can share a pic or video where i can locate the sensor?

[tomrivers]

The check engine light went away by itself after this code appeared any reasons why?