The awd does not engage the back wheels on the 04 xc90 Volvo how ever the "w" does appear on dash
There are quite a few things that can cause this. It should be as simple as a software upgrade to the differential electronic module or as expensive as an angle gear.
I don't know of a safe way to check if the driveshaft is turning without raising the car off the ground, but that's where you'll need to start.
If the driveshaft turns but the rear wheels are not engaging then the codes will need to be pulled and the system diagnosed.
If the driveshaft does not turn then the angle gear or the collar that connects the transmission to the angle gear is stripped
The only thing I could tell you that might actually help right now is... Remove the battery cover in the rear of the vehicle, it's under the load floor. Disconnect the battery cables and leave them off for two minutes. Reconnect them and drive the car. If the AWD engages then a software upgrade may fix it, or there's an intermittent electrical fault in the sensor system.
Volvo has a complimentary (free to the customer) software upgrade available for all cars sine 2001. Some dealers do it, some not so much. Ask for it, most of the software packages I've seen include the updates to the differential electronic module (DEM) if they have anything available anyway.
Hope this helps and good luck.
Feb 19, 2015 |
2004 Volvo XC90