DIY Fix - Fault Code P0128 (Coolant Temperature Below Thermostat Regulating Temperature)

[@zhanandryan2277]

Love it the way he is explaining very clearly very well and not complicated to be hard to understand thanks very very much

[@8020Media]

Z - Thanks for the feedback. We hope it helped!

[@rickfiji4486]

Great explanation! Nice job breaking it down into a way the normal person can understand.

[@8020Media]

R - Thanks for the feedback! That's our goal with all of our DIY type videos.

[@JTahgs]

I had this code and changed the therm and housing. Engine light is still on. Gonna check out these other possible issues, thanks man!

[@8020Media]

J - Thanks for the feedback! Keep us posted.

[@iproject1850]

Did you reset the codes? The light will stay on, even after the fix is made, if you don’t reset the codes with a scanner.

[@8020Media]

I - Correct!

[@THEHELLHOUND456]

Thanks for explaining the diagnosis likelihood involving sevondary symptoms and other codes to narrow the most likely cause

[@8020Media]

T - Thanks for the feedback. We hope it was helpful!

[@Tony-v9z]

Great explanation of p0128 code. Thanks

[@8020Media]

U - Thanks for the feedback! We hope it helped.

[@tanvirbains0001]

i got all the symptoms, excellent explanation. thanks buddy

[@8020Media]

T - Thanks for the feedback! We hope it helps.

[@ahoye1]

Thx 4 the in depth explanation of code P0128, this code just came on my Honda Insight and wanted to know what it meant and I went to many google searches and none really explained all of the causes like yours (I mean numerous, many etc...) you're the man, Gracious ;-)

[@8020Media]

A - Thanks for the feedback! Glad you found it helpful.

[@qquizz]

Thanks for the tips. I have heard though that you want to keep those hose clamps exactly like they were when reusing them.

[@8020Media]

Q - Thanks for the feedback and insight!

[@blazeandcyrus]

Really appreciate the tips on coolant temp sensor diags.

[@8020Media]

B - We hope it's helpful!

[@RhetoricWolf]

Very well spoken and clearly explained. Thank you for this.

[@8020Media]

R - Thanks for the feedback! We hope it helped.

[@manolotech1110]

Excellent and complete breakdown.

[@8020Media]

M - Thanks for the feedback! We hope it was helpful.

[@austinmartin6918]

I just got this fault code, but my thermostat is maybe a couple months old at most. Is it likely that I need to replace the sensor, or would it probably be the thermostat again? Edit, in case this helps: my heat is working fine. I actually had it on pretty high when the check engine light came on. The engine temperature gauge was showing that it was running cooler than normal then. Everything seems to be working fine since then, besides the increased fuel consumption.

[@8020Media]

A - We would check the sensor and go from there.

[@TheLionInTheArea]

hey man, im getting p0128. if it is the fan running alot even in cold temperatures what can be the cause, is there something like a fan sensor on the fan or something else that may need to be checked or changed. thankyou

[@8020Media]

Probably the coolant temp sensor - if the sensor is bad and sending wrong readings the fan might think it needs to stay on.

[@michaelelliott2946]

Excellent information and presented very well!

[@8020Media]

M - Thanks for the feedback! We hope it was helpful.

[@robmyers1956]

THANK YOU FOR A GOOD QUALITY VIDEO YOUR PRESENTATION WAS EXCELLENT

[@8020Media]

R - Thanks for this feedback! We hope it was helpful.

[@aaroncarpenter759]

Great explanation, thank you!

[@8020Media]

A - Thanks for the feedback! We hope it was helpful.

[@MikeBaessler]

Great video and expalation. Thank You.

[@8020Media]

M - Thanks for the feedback! We hope it helps.

[@stanislav9608]

Great video. I subscribed. After replacing thermostat and coolant temperature sensor, my vehicle is not reaching the operating temperature, and the heater blows warm air only when temperature is set for 29 C. (84.2 Fahrenheit). I installed OEM parts and looks like the Thermostat is defective and is staying partially open. I order another OEM thermostat. Could you please advise how to test it before the installation.

[@8020Media]

S - Thanks for the feedback. There are ways you can do this! There's plenty of youtube videos on this that are helpful.

[@johngavina1]

Thank you. I now feel like I'm not just tossing parts at it. Mine was quite low on fluid so I'm thinking air pocket. Then I'll get a thermostat if that doesn't solve it.

[@8020Media]

J - Thanks for the feedback. Hope the video was helpful!

[@tynitty6082]

What if your heat works tho? I changed my sensor my thermostate and wire harnesss and I still get the code my temp drops to C and fan turns on my A/C don’t work but my heat still if I clear the code the A/C will start back working and it a come off of C but engine still doesn’t warm up

[@firstlast-pt5pp]

disconnect the negative battery terminal for 5 minutes and reconnect

[@DigDugFTW]

Maybe it’s a thermostat rationality issue if you can replace a thermostat that might help it thermostat is stuck in open with agent starts it won’t begin and close the loop that’s the age it will be warmed up for feeding it’s going to the radiator as a result it’ll run colder than required and this cord is for to the heater core if the heater core is supplied with cooler coolant then it’ll have an issue with producing shit. And this point the translation option for Apple sucks so much I’m not gonna give any more time try to explain I’m probably wrong have a nice day thanks

[@josemagana-vasquez8204]

Thank you for this video

[@toliyk.8152]

Thank you, great information

[@8020Media]

T - Thanks for the feedback! Hope it helped.

[@aarond33]

Can this result in remote starter to stop working in a chevy blazer?

[@8020Media]

A - Not likely.

[@alonzabarnes6711]

I changed thermostat in my 2018 p0128 and the check engine light went out two weeks ago later back on any advice on what to do next

[@8020Media]

A - Is it the same engine code showing?

[@RobertHinson-p1h]

Very informative

[@8020Media]

R - Thanks for the feedback! We hope it helps.

[@malcolmrichard4283]

So i have a zzp aluminium thermostat, i just changed both sensors and the cod went away after the sensors were changed, but a day later fan kicked on but no engine light, car also makes it up to full temp at idle, system is fully bled to my knowledge. So what now? What could be wrong ?

[@8020Media]

M - Do you have any engine codes?

[@Ckimble]

Does the code need reset or will it go off over time (after replacing thermostat)?

[@8020Media]

C - It would be best to reset, but it will go off after being driven for 50-100 miles if the issue had been addressed.

[@albertg8917]

Informative video. Thanks

[@8020Media]

A - Thanks for the feedback. We hope it helps!

[@kevinmetcalf6371]

GREAT video... tks

[@8020Media]

Kevin - Thanks for the feedback! We hope it helps.

[@tdoteastend2540]

Got my thermostat replaced almost 2 months ago. This was after noticing my temp gauge stayed at the coldest position all the way left (2017 gmc terrain) and later the C.E.L came on with code P0128. A few times since, with a couple week space in-between each time, I noticed the temp gauge would stop working or stay at the coldest position for a brief period (less than a day) then start working again. Just yesterday the gauge stopped working again. And today the C.E.L came on. I scanned it and code P0128 came back. Also the fan stays on for a minute or 2 after the vehicle has been turned off (same thing happened the first time when thermostat was replaced) Could this be a faulty thermostat that I bought to replace the old one? Or maybe a sensor?

[@8020Media]

T - It certainly could be a sensor related issue. Sounds like it is intermittently failing.

[@tdoteastend2540]

Someone just told me could possibly be a small leak in the thermostat housing. Could this be a possibility as well?

[@8020Media]

T - Could also be a possibility. However, the temp gauge fluctuating points to sensor.

[@user-dz2pz3ol7p]

Change temp sensor common on those trucks

[@michaelkryzanski]

Great video. Thanks!

[@8020Media]

M - Thanks for the feedback. We hope it helps!

[@DamonTheJedi]

Thanks, great video

[@8020Media]

Thanks for the feedback!

[@MichaelNassios]

Where should I order a new thermostat?

[@8020Media]

M - Need some more information.. What vehicle do you have?

[@MichaelNassios]

@@8020Media 2018 Nissan Murano

[@maritesmhayayson8743]

Can we still use the car with this code?

[@8020Media]

M - You can, but we wouldn't advise driving on it for very long. Make sure to stay on top of your coolant levels if you are needing to drive on it.

[@Motorsports_3]

Can p0135 and p0030 be caused by p0128?

[@8020Media]

M - It's possible.

[@wandacaddell5013]

Do this cause check engine light?

[@8020Media]

Yes, any sort of active fault code will cause a check engine light

[@eiyekeye]

Thanks!

[@8020Media]

Eiyekeye - Thanks for the support! We hope it helped.

[@kdeh21803]

Give me a few more ideas.... I have a CEL 128 and I've replaced the themostat and the coolant temp sensor 2 times for both of these and the code won't go away??

[@8020Media]

K - Have you cleared the code?

[@kdeh21803]

@@8020Media I have 6 scanners.... Yeah I've cleared the code and it keeps coming back.......

[@8020Media]

K - Cooling fan, intake air temp sensor, PCM?

[@kdeh21803]

@@8020Media cooling fan is working and I changed intake temp sensor.... No luck , and I checked with a service department and gave my vin and they said there was no update to PCM.......

[@8020Media]

K - Could be a silly question, but is the coolant at proper levels?

[@invisibletrailglow836]

Logical, thanks

[@8020Media]

I - Thanks for the feedback!

[@jaydee5156]

Okay, let's assume that I've changed the thermostat. The engine is cold. There's new coolant in the system and it's also cold. How will the PCM know? What's going to turn off the check engine light?

[@8020Media]

You can delete the stored code(s) which will get rid of the check engine light. The other option is driving the vehicle until the engine is up to operating temperature. Once the ECU detects the problem is no longer present, it should automatically get rid of the code and CEL.

[@jaydee5156]

@@8020Media Thank you. My daughter is dealing with this on her car. I'm the only one she trusts to fix it for her.

[@8020Media]

J - Keep us updated!

[@thaiebony]

I have a 2019 GMC acadia with this code. Repairs at the dealership to change thermostat is $2300. 😢

[@8020Media]

T - Sorry to hear! Thanks for sharing your experience.

[@matthewebel2960]

Yep! I have a 2020 blazer that did the same. I said no way and changed it myself along with the temp sensor. Pain in the butt but worth saving that much.

[@8020Media]

M - Thanks for sharing your experience!

[@eiyekeye]

Thanks!

[@8020Media]

T - Thanks for the feedback and support!