Thread: Warning light: oil temp Gearbox

Ah, now let me see!
Dead sender?
It's very common for the sender to leak in a little water and then short circuit. It happened to my RRC with my trans overtemp light where one of the senders is located behind the rad in the cooler line.
If yours is an auto it probably also has a sender in the cooler line as well as the one in the transfer case.
To check which one disconnect the wires of one then the other and see when the light goes out. I have never checked the wiring diagram but I am pretty sure they ground parallel not in series.
I bet on the one in the cooler line.
Regards Philip A

Originally Posted by discomarsh

The transfer case oil temperature warning light ...

I mis-described the problem: it's not the transfer case light, but the gearbox oil temperature light.

Well ditto on my earlier post.
Regards philip A

Have to agree, dodgy sensor, VERY common problem.

Checked the ATF today, & it's full, as expected (recently serviced). So oil temp & level are not the reason for the warning light, I have to agree with my learned friends that the sensor is stuffed.

The sensor must be a bugger to replace, considering its location. Anyone know the costs?

The sensor is not expensive, about £20 UK, so $40 "ish" ?

Part Number UBI100030

I Replaced mine by removing the cooler assy completely, but I dont think you need to tbh, after doing another (gearbox cooler pipes) job I noticed you can most likely swap the sensor through the wheel arch liner access panel near the front anti roll bar.

If you have a nosy through this, you will see it in a few of the piccys.

www.discovery2.co.uk / Gearbox Oil Cooler Pipes

Thanks for that link UP.

I wonder how one might prevent water ingress into the sensor in future.

The sensor is a sealed unit, i doubt water finished it off, I know of sensors that have failed on cars never even been in a puddle lol