XC70: General - high pitch noice

big_yin · Sep 25th, 2022, 11:10

Hi

I am a new owner of a 2010 XC70 D5 AWD Automatic

I took it on a long drive yesterday from Hexham down to Peterborough and back. Car behaved very nicely but on the way back I had twice a high pitch noice coming from what I think was the back and the second time there was some whitish dust / smoke behind the car. It happened after I was stuck behind a car that was going from 70 down to 50 mph back to 70 mph and that happened a couple of times before he moved over.
The car was shifting constantly between gears when this happened.

This was around Doncaster and after that it didn't happen again and the car drove normal without any problems.

I read the codes this morning with iCarsoft V2.0 and no problems where found. All fluid levels are also normal.

Maybe it is nothing and that it was something on the road itself, but maybe somebody experienced something similar and knows what it could have been?

Simmy · Sep 25th, 2022, 11:55

sounds like the car was doing a dpf regen its a normal thing to happen dont worry to much it will do one at regular intervals . warning lights and messages will warn you when there is a problem .

big_yin · Sep 25th, 2022, 14:22

Thank you for your answer Simmy.
I haven't had a car with DPF before so wasn't aware that this was going to make a noise.

Simmy · Sep 25th, 2022, 17:29

dpf regens dont normaly make any noise but the whitesh /dust will be burnt soot/ ash.

yostumpy · Sep 25th, 2022, 19:40

Dont't think it should have changed down a gear at 50?

FreshAir · Sep 26th, 2022, 13:41

Quote:

Originally Posted by yostumpy

Dont't think it should have changed down a gear at 50?

It is possible that it changed down to keep the revs up to maintain the regen.

In a manual the gear change guidance will suggest changing up at higher speeds than normal.

big_yin · Sep 27th, 2022, 01:38

Quote:

Originally Posted by yostumpy

Dont't think it should have changed down a gear at 50?

The speed was changing a couple of times between 50 and 70 mph.

Sep 25th, 2022, 11:10	#1
big_yin Senior Member Last Online: Apr 19th, 2024 11:52 Join Date: Aug 2006 Location: Hexham, Northumberland	high pitch noice Hi I am a new owner of a 2010 XC70 D5 AWD Automatic I took it on a long drive yesterday from Hexham down to Peterborough and back. Car behaved very nicely but on the way back I had twice a high pitch noice coming from what I think was the back and the second time there was some whitish dust / smoke behind the car. It happened after I was stuck behind a car that was going from 70 down to 50 mph back to 70 mph and that happened a couple of times before he moved over. The car was shifting constantly between gears when this happened. This was around Doncaster and after that it didn't happen again and the car drove normal without any problems. I read the codes this morning with iCarsoft V2.0 and no problems where found. All fluid levels are also normal. Maybe it is nothing and that it was something on the road itself, but maybe somebody experienced something similar and knows what it could have been? __________________ 2004 V70 D5

Sep 25th, 2022, 14:22	#3
big_yin Senior Member Last Online: Apr 19th, 2024 11:52 Join Date: Aug 2006 Location: Hexham, Northumberland	Thank you for your answer Simmy. I haven't had a car with DPF before so wasn't aware that this was going to make a noise. __________________ 2004 V70 D5

Sep 25th, 2022, 19:40	#5
yostumpy Senior Member Last Online: Today 06:29 Join Date: Mar 2021 Location: Gravesend	Dont't think it should have changed down a gear at 50? __________________

Sep 25th, 2022, 11:55	#2
Simmy Premier Member Last Online: Yesterday 21:43 Join Date: Mar 2017 Location: Manchester	sounds like the car was doing a dpf regen its a normal thing to happen dont worry to much it will do one at regular intervals . warning lights and messages will warn you when there is a problem .

Sep 25th, 2022, 17:29	#4
Simmy Premier Member Last Online: Yesterday 21:43 Join Date: Mar 2017 Location: Manchester	dpf regens dont normaly make any noise but the whitesh /dust will be burnt soot/ ash.

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