I inherited a 2004 XC70 when I got it they told me the bevel gear was bad but the car drove normally. No unusual noises coming from the car. Well I’ve thinking if the bevel gear is bad wouldn’t the car be making noise? I do not have power going to the rear wheels. That was confirmed last winter. What could be the problem with the car? I have been looking online for info but all I have found is a video of someone driving their XC90 with a bad angle gear and it sounded like he was driving down a loose rock road with rocks hitting the bottom of the car. I have also seen people talking about a whirling noise on desceleratoin. I have none of that. Any help would be appreciated. Thank you I and looking forward to any answers.

 

A good start would be scanning the car and seeing what codes are in the DEM (differential module) . VIDA will give you the most info. DEM failures are common and sometimes expensive to fix - you can find basic trouble shooting info here -

https://xemodex.com/us/knowledgebase/dem-flow-chart/

https://xemodex.com/us/knowledgebase...c90-2005-2010/

If you can get all 4 wheels off the ground safely you can try to turn the driveshaft by hand with the car out of park - or spin both front wheels. If the angle gear is still intact the driveshaft and front wheels move together. There is a coupler between the trans and the angle that can fail also - more often on the higher powered cars (R's and modified r's)

So if you can turn the driveshaft and the front wheels don't move or you can turn the driveshaft with the shifter in park - you have a stripped coupler or something seriously wrong in the angle gear.

If that all checks out you have a haldex problem.

I jumped ahead too quickly - is the driveshaft and angle gear still mounted in the car?

 

Yes the whole thing is there. I have run it for codes and the only one that comes up is the Radio. I replaced the factory radio. I will try to lift the carand after that I will get back to you.. Thank you for the quick response.

 

What scan tool did you use?

 

ICarsoft scanner.

 

The DEM is not considered a emission related module - Can you access DEM codes?

 

It does more then that. I can look at the entire electrical system with it. The different modules and such. If the right rear turn signal is out I can see it on that scanner.