I've been having this problem for months, my check engine light wont go off, and when i scan the code I get is:
SCANCODE P0116 - Engine Coolant Temperature Circuit

I've changed, the fan relay, thermostat, cooling temp sensor, still same problem

Please help

 

Very strange OEM parts?

 

yeh I was worried thats what you were gonna say... aggghh
yes all OEM parts... what should I do?

 

Can you read realtime with your scanner?
If so see what the coolant temp is reading.

 

yes I think I can get that, I'll have to check tonight and let you know... what should I be looking for?

 

See what the temp is saying it is.

 

after the car was on for about 6-7 mins, reading 82, sounds about right?
could it have anything to do with the computer... hope not

 

Try driving it for about 15 minutes and then let it idle for a few and see if it is still the same.

 

did that, went to 84.. when I turn the car off the fan stays on for about 5-10 mins

 

Maybe something wrong with the new sensor.
Is it low when cold?

 

yeh its a little low when cold... I have a spare sensor lying around that I'll try, maybe I'll try a new thermostat as well, no harm in that....

Could it be the computer though? Sending a wrong signal? I hope this doesnt turn out to be a HUGE problem thats not worth the cost... I luv this car too much

 

The computers aren't known to have problems like this.

 

Tech.. you are the man!

Thanks for your help, I had a spare sensor and thermostat hanging around soI changed them both.. and Voila... four days.. no problem! I brought them both back to volvo, and they gave me a refund on the thermostat.. it was faulty!

I guess this is why I had no cabin heat and a problem starting in sub zero temps

glad its over

 

Congrats!!