Question about 2004 Volvo XC90

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2004 XC90 T5 2.5 ltr AWD- 88,000 kms (canadian car). Dealer reports a problem with the rear differencial caused by a faliure in a computer known as D.E.M. part # 46030.

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  • twadlo Feb 03, 2009

    WTF is this with volvo? 2004 2.5T XC90, 60,000 miles, brake failure light, now saying I need a new DEM at 1600 bucks for part alone.

    I am done with VOlvos for sure if they will not cover this. Honda and Toyota here I come!



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Get Honda CR-V!!. lol.

A knight....

Posted on Jul 26, 2008


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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

1 Answer

Were is the abs hidraulic valve on a 2004 xc90 2.5t awd

Driver's side below the master cylinder. It is the pump motor on top of the control module

Feb 17, 2015 | 2004 Volvo XC90

1 Answer

Awd is not working

check for codes stored in the DEM. the most common cause is the oil pump and pressure sensor

Feb 23, 2013 | 2004 Volvo XC90 2.5

1 Answer

Rear dvd

Salvage yard in your area or dealer. You might get lucky if you search online at

Jan 31, 2013 | 2004 Volvo XC90

2 Answers

How do i get rid/ reset message xc90 "transmission service urgent" i have already taken to volvo dealer about six months ago. they could not pin point issue on diagnostic. Cheers

You first have to retrieve fault codes from your computer network then you have to diagnose the systems/circuits indicated by the fault codes to determine what the cause of the failure is, then you must repair the system/circuit at fault and then reset the computer system. If the dealer cannot do this, I don't know who can. Did they tell you what fault codes they were getting? If so, we can look up the troubleshooting charts for those codes as well as do a Technical Service Bulletin (TSB) search to see if this is a known problem with a known fix. Without the codes, your guess is as good as mine.

Sep 11, 2011 | 2004 Volvo XC90

1 Answer

2004 AWD Aztek - AWD Disable light on.

I had this happen to my car and paid entirely too much to the dealer to get it fixed. For me, it was the harness that you think it is, and it affected the battery- I needed to replace it- and also the computer. I'm not sure if mine was frayed, but I've heard that this harness has been known to become frayed and shorts out because of that, which is what I imagine causes the failure, and the shorting out is what destroyed my battery and fried my computer.

Jul 19, 2010 | 2001 Pontiac Aztek

1 Answer

2005 XC90 T6 AWD making a whirling noise upon acceleration

Add me to the list. Just got back from a Volvo dealership in Chicago and was told the 'winding' noise we're experiencing during deceleration in our 2004 XC90 is due to a failing transmission,so i would suspect the same accelerating. hope all works out for you

Jul 14, 2009 | 2005 Volvo XC90

5 Answers

I have a 2004 Pont. Aztek. The AWD Disabled light is on

AWD Light is caused by your Rear Wheel Hub(s) one or both are going bad. Dealer cost is $500.00 part at Auto Zone is $129.00. Not to difficult to replace if you are some what mechaniclly knowledgable

May 03, 2009 | 2004 Pontiac Aztek

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