XC90 reverting to rear-wheel drive

MHarrison56 · Post by **MHarrison56** » 10 Dec 2018, 09:35

Hello,
Looking to fix my 2013 XC90. Something is making a rubbing noise, kind of a light metal sound. And the car is only rear-wheel drive. 100%. Any ideas where to look first?
Thank you in advance.
Martin

Post by **Rattnalle** » 10 Dec 2018, 09:53

Strange since pretty much all AWD errors I've read about previously are about cars loosing the rear wheels not the fronts.

It'll be interesting to read what the community comes up with on this one. I haven't got a clue. To me AWD is something that just cost extra to buy, drive and maintain.

MHarrison56 · Post by **MHarrison56** » 10 Dec 2018, 10:58

Knowing only a little about the system in the Volvo, best I can guess is no power is going to front wheels therefore forcing all power to rear. However I'm not even sure what component to look at first.
M

Post by **ggleavitt** » 11 Dec 2018, 08:14

I'll look forward to someone trying to explain this. FWD car with a bevel gear to transfer power to the back, engagement of rear differential controlled by a wet clutch as a function of front wheel spin.

See diagram-

: XC90_DEM_TF-80SC.JPG (86.42 KiB) Viewed 1232 times

edit 121218- Replace diagram

Post by **jimmy57** » 11 Dec 2018, 11:54

It is conceivable that you could have an axle failure of one of the front axles and have RWD only. Tell us more.

Post by **ggleavitt** » 12 Dec 2018, 10:38

No check engine light on dash, no antiskid service required message, no DTC, just a light metal rubbing sound and the car is 100% RWD?

So yes, agree, there's more to be told in this story in order for the scenario to fit.