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Discussion Starter · #1 · (Edited)
I recently noticed my AWD not working a couple snow falls ago and brought it in to the local Volvo expert and he said my diff pump was not working and gave me an estimate but I have been working on cars since I was 17 so I figured I would give it a go. It was a pretty simple repair and dropped the vehicle down and took it for a test drive to have the AWD still not working. I have no codes at all so my question is do I need to reset something to get the new pump to work? If the diff fluid is a little low will that cause the AWD to not work or can there be something that can also cause it not to work without any codes whatsoever.

3.2l

Thanks
DH
 

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Add engine info please for your 2007 XC90 AWD, could make a difference in this case.

Might be good to omit mechanical from the mix as a first step- https://forums.swedespeed.com/showt...king-or-Not-Angle-Bevel-Gear-Mechanical-Check , it'll look just like the problem you're having, with no codes being thrown. Couple variations on the theme, check with the car on a lift if you're not sure about the "test" with all four wheels on the ground.

If mechanical is sound, walk through the Xemodex troubleshooting flow for DEM- https://xemodex.com/us/diagnostic-flow-charts/ , see how far you get.

Good luck with your repair.
 

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Discussion Starter · #3 ·
Thank you for that info, my mechanicals are fine but it failed the REM test, I tested the old motor which the repair shop told me was bad and it was working fine on 12 volts, I then checked the REM at fuse #23 and nothing, it looks like I get to have my REM repaired.
 
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