jeffalex1020

The other day my CEL came on while driving to work. The oil temperature was normal but didnt seem to move fast (usually blinks between 2 temps)

Code is p0939- Hydraulic Oil Temperature Sensor Circuit Low. Now it will not display temperature at all. Car runs just fine but I have only driven it once since then. I will be taking it in but I am curious if others have seen this and if its just a new sensor needed.

2010 c63 44xxx miles

Tlnt60

Might be a silly question, but have you checked your oil level as well?

Mort

Sounds like a bad sensor to me. See what the shop says.

Good idea to check your oil level. Probably nothing to do with it but can't hurt.

jeffalex1020

You would think I would have check the oil! Will do that today. Getting married this weekend so have to put off taking the car in for about a week

Tlnt60

Ha! Yea totally get it! Congrats on the wedding! So I think best practice is to get the car up to temp and then let it sit for 10 min then check the oil. But I think given your situation I wouldn't run the motor if you don't have to if it is low oil. If it's so low that it's causing this, then it should register either way I would imagine.