Coolant temperature sensor issue

[iksplizit]

My fan was constantly running and killed my battery. Code reader said coolant temperature sensor was bad, so I replaced it and during the process I busted the lock on the connector. So i replaced the pig tail and it worked just fine. Week later temperature wasn't reading. I figured in my haste I didn't have a solid connect on the wires. So i redid everything and made it look pretty. Worked just fine. Two weeks later it's not reading again and the fan is going crazy.

What is going on? Did i miss something? Why does it start working then randomly goes out?

Update: I deleted the codes and my fan came back on and temperature started reading correctly ‍

Next day happened again. Code p0128 it seems to only happen when I'm on the freeway for more than 15 minutes.

 

[iksplizit]

It ended up being the thermostat. It was stuck open and during the cold weather on the freeway, it would get so cold that it would send the system into panic mode where it shuts off the temp gauge and puts the fan to full speed

 

[Tahoe14]

Glad you got it fixed and thanks for reporting back with the fix. This may help someone in the future.

 

[OR VietVet]

Please remember, in the future, that a code reader or a scanner will NEVER tell you a sensor or switch or just about anything, is bad. They are pointing you to a circuit/system. We are not at A I yet.

Parts store employees, that pull codes, will tell you a code means "this or that" is bad. Not NO but HELL NO. It is a circuit or system. Does not tell you that one particular thing is bad. Parts sellers, sell parts. They are not, I repeat NOT, diagnostic specialists!

Not saying that a parts store told you the part needed, is just an example and your reader is no different.

 

[iksplizit]

Please remember, in the future, that a code reader or a scanner will NEVER tell you a sensor or switch or just about anything, is bad. They are pointing you to a circuit/system. We are not at A I yet.

Parts store employees, that pull codes, will tell you a code means "this or that" is bad. Not NO but HELL NO. It is a circuit or system. Does not tell you that one particular thing is bad. Parts sellers, sell parts. They are not, I repeat NOT, diagnostic specialists!

Not saying that a parts store told you the part needed, is just an example and your reader is no different.

True, when I pulled the code, I went with the most simple, cheapest solution. I ended up breaking the clip and making the whole thing more difficult than it needed to be.

 

[The guitar zombie]

I am confused. How do you know your open thermostat caused the temp guage to shut down?

 

[GEMINI]

BRUH.......thanks for this post,...hell...site. I am living this story right now, minus the broken clip.....I was thinking thermostat after changingthe sensor...."what ever can cause the sensor to be DIRTY can possibly cause the thermostat to stick"...thanks for the share!!!!