XC90 Haldex/AOC / rear diff noise

Klawo · Nov 20th, 2023, 08:58

Hello,

I have XC90 D5 185 hp, manual transmission with AWD.
About a month ago a noise started to be heard at some speeds. Mostly it happens when car is cruising at about 80 km/h / 50 Mph.
I recorded a short video where the buzz can be heard. The car was travelling at around 80 km/h. Noise comes from rear side of the car. When a clutch pedal is pressed the noise remains, if additionally brake pedal is pressed noise dissapears.
https://www.youtube.com/watch?v=kfGVo1umOic
Below is a description of the moments in the video:
00:00
00:08 - Noise is louder
00:09 - Clutch pressed
00:14 - Brake pressed gently
00:17 - Clutch released
00:22 - Noise is louder again
00:33 - Clutch pressed
00:38 - Brake pressed gently

I checked oil levels in Haldex/AOC and rear diff - OK. Oils were changed 2 years ago.
Noise do not appear when the F23 fuse is removed.
Here is my question:
Based on this description, can you indicate which component (Haldex or rear diff) should be replaced/repaired? Does it point to any particular bearing?

Phil S · Nov 25th, 2023, 08:41

It's difficult to hear on the video - but I am experiencing some drive issues myself at the moment.

Over the summer we did a long European trip in the car and I noticed a fairly loud what I thought was wheel bearing noise on a motorway in Switzerland - at the time I put it down to road surface, but forward wind 3 months and I am experiencing a drive issue - see here:

https://www.volvoforums.org.uk/showthread.php?t=336493

Not got to the bottom of it yet - but I don't do a huge mileage, so if this is related you may start to experience similar soon

Klawo · Dec 4th, 2023, 08:25

The noise is definitely not a clicking or ticking. As phone app showed frequency is about 200-230 Hz.

Nov 20th, 2023, 08:58	#1
Klawo New Member Last Online: Apr 22nd, 2024 11:49 Join Date: Nov 2023 Location: Milanówek	XC90 Haldex/AOC / rear diff noise Hello, I have XC90 D5 185 hp, manual transmission with AWD. About a month ago a noise started to be heard at some speeds. Mostly it happens when car is cruising at about 80 km/h / 50 Mph. I recorded a short video where the buzz can be heard. The car was travelling at around 80 km/h. Noise comes from rear side of the car. When a clutch pedal is pressed the noise remains, if additionally brake pedal is pressed noise dissapears. https://www.youtube.com/watch?v=kfGVo1umOic Below is a description of the moments in the video: 00:00 00:08 - Noise is louder 00:09 - Clutch pressed 00:14 - Brake pressed gently 00:17 - Clutch released 00:22 - Noise is louder again 00:33 - Clutch pressed 00:38 - Brake pressed gently I checked oil levels in Haldex/AOC and rear diff - OK. Oils were changed 2 years ago. Noise do not appear when the F23 fuse is removed. Here is my question: Based on this description, can you indicate which component (Haldex or rear diff) should be replaced/repaired? Does it point to any particular bearing?

Nov 25th, 2023, 08:41	#2
Phil S 2015 V70 T6 AWD Last Online: Dec 1st, 2023 08:02 Join Date: Aug 2006 Location: Macclesfield	It's difficult to hear on the video - but I am experiencing some drive issues myself at the moment. Over the summer we did a long European trip in the car and I noticed a fairly loud what I thought was wheel bearing noise on a motorway in Switzerland - at the time I put it down to road surface, but forward wind 3 months and I am experiencing a drive issue - see here: https://www.volvoforums.org.uk/showthread.php?t=336493 Not got to the bottom of it yet - but I don't do a huge mileage, so if this is related you may start to experience similar soon

Dec 4th, 2023, 08:25	#3
Klawo New Member Last Online: Apr 22nd, 2024 11:49 Join Date: Nov 2023 Location: Milanówek	The noise is definitely not a clicking or ticking. As phone app showed frequency is about 200-230 Hz.

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