Loud rattle at start up (intermittent)

Faults and Technical chat for the Volvo XC40
RogerM
Posts: 1
Joined: Tue Jan 14, 2025 7:54 am

Post by RogerM »

I have a 24 B4 and it’s exactly the same. Only started during this current spell of extremely cold weather. Never done it since I got the car in April 24. Otherwise it runs well.

riskymoth
Posts: 79
Joined: Fri Dec 08, 2023 2:17 pm

Post by riskymoth »

I've booked mine into the garage to get it looked at - will report back in a couple of weeks what they find (if anything). I did video the car starting up on a very cold morning, and it obligingly made the noise, so can try and work out how to post here if anyone's interested. Also, I looked under the bonnet to see if there was anything obvious, and I did notice that all the bolts holding the heat shield to the rear of the engine bay were all quite loose - I tightened them up just by hand, and it's not made the noise since, but then again it's not been nearly as cold - and I'm not sure the banging noise it was making could be down to this rattling around...
poleposition
Posts: 129
Joined: Tue Jan 04, 2022 11:45 am

Post by poleposition »

Something very wrong with the heat shield bolts if you could tighten them further by hand?
XC40 MY23 B4P Plus AWD 7 Speed Auto AAOS
riskymoth
Posts: 79
Joined: Fri Dec 08, 2023 2:17 pm

Post by riskymoth »

Yes, exactly my thought - they'd obviously not been torqued up either at manufacture or during the recent service - but I'm not sure why they'd have needed to remove this part, and the noise has happened before the service. I'll get the garage to check when it goes in shortly.
riskymoth
Posts: 79
Joined: Fri Dec 08, 2023 2:17 pm

Post by riskymoth »

An update on the issue where my MY24 B3 XC40 was making a loud clanking noise when starting around freezing outside after a few days of no use. This was diagnosed as due to a faulty mild hybrid auxiliary belt tensioner, which has now been replaced (along with the belt). Hopefully this will mean no shredding belt in the near future...

Video for anyone who might suffer from this in the future:

https://www.youtube.com/shorts/OQa3TR8EsaQ
poleposition
Posts: 129
Joined: Tue Jan 04, 2022 11:45 am

Post by poleposition »

That's good you got it sorted before it failed completely. The video shows the sound very well.

When my belt failed there was no warning at all.
XC40 MY23 B4P Plus AWD 7 Speed Auto AAOS
Mervin
Posts: 29
Joined: Sat May 01, 2021 1:32 pm
Location: London

Post by Mervin »

Hi Polepostion, How many miles did you have on your car when your belt failed.

Thanks
2023 B4 Plus Dark AWD.Driver Assist and BLIS Tinted Rear Windows. Spare Wheel. Black
Jaycee750
Posts: 130
Joined: Sat Oct 05, 2024 7:56 pm

Post by Jaycee750 »

Are they still sending cars from the factory with this tensioner issue? If not when was the cut-off date?
Sept 2024 Volvo XC-40 B4 Plus Dark in Cloud Blue
JFDIT
Posts: 1687
Joined: Tue Sep 28, 2021 5:21 pm

Post by JFDIT »

I've been told by a Volvo Recovery Technician that it was an issue with the Serpentine Belt rather than the tensioner causing the reported failures. The belt has subsequently been redesigned. He had never seen a failed tensioner but many failed belts, although not so many this last year. Of course that doesn't mean a tensioner cannot fail. He carries a Serpentine belt kit with him and can replace at the roadside.

Looking at mine, there appears to be a V belt that drives the water pump as well although it could be the serpentine belt, hard to tell from the video.

Screenshot_20250205-150149.png

XC40 MY24 B4 Ultimate Dark, Black Leather, Crystal White, 20" Rims
Lincolnshire England.
poleposition
Posts: 129
Joined: Tue Jan 04, 2022 11:45 am

Post by poleposition »

Mervin wrote: Tue Feb 04, 2025 7:41 pm Hi Polepostion, How many miles did you have on your car when your belt failed.

Thanks
About 3000 ...
XC40 MY23 B4P Plus AWD 7 Speed Auto AAOS
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