Hi folks,
I've just purchased a 57 plate C5 2.2 auto, with the usual niggles of heater flaps - from postings here a common fault.
However, one curious thing that I've never encountered before is that when the ignition is off there's a quiet humming from behind the passenger side of the dashboard. You can only hear it with the doors closed. Obviously something's still running even after switching off and removing the key. It's not a fan in the engine, but it has been suggested to me that it could be one of the myriad relays behind the console, or something to do with the EGR valve. If I disconnect the battery it stops, but obviously I don't want to have to reconnect every day and reset everyhting on the Navidrive each time.
So - any ideas folks?
Best wishes,
David.
Quiet motor noise on a C5 when switched off
Moderator: RichardW
-
- Posts: 51
- Joined: 25 Nov 2013, 12:13
- Location: Ludlow Shropshire
- My Cars: '03 C5 2.2 Exclusive Estate.
In the past:
'07 C5 VTX+ 2.2. 170hp Estate auto
03 C5 2.0 Exclusive Estate.
95 XM 2.5D Exclusive
94 Xantia 1.9D Estate
92 XM 2.0i
90 XM 2.0
Various CXs (CX22, CX Pallas, CX GTi, CX Estate)
81 GSA Pallas
1974 DS23 Estate
1974 DS23 Pallas
1970 DS21 Pallas EFI - x 3
-
- Posts: 1503
- Joined: 26 Feb 2003, 10:52
- Location: Yorkshire
- My Cars: Current:
Volvo V60 D4 180
Previous:
BX16RS (two of),
BX19TZI,
Xantia 2.0i saloon,
Xantia 2.0 Exclusive CT turbo Break,
Peugeot 807 2.0 HDi 110,
Renault Grand Scenic, 2.0 diesel (150bhp)
C5 X7 2.0 HDi 160 which put me off French cars possibly forever - x 16
Re: Quiet motor noise on a C5 when switched off
Ours would hum until the doors were locked. No idea what it was, just assumed it was normal behavior.
- Michel
- (Donor 2022)
- Posts: 2207
- Joined: 29 May 2017, 13:50
- Location: Nothanks
- My Cars: Some cars and a motorbike
- x 659
Re: Quiet motor noise on a C5 when switched off
It's just all the systems shutting down, the noise will stop after a minute or so once you get out the car and lock it, or at least it should. Both my C5s, C4 and C4 Grand Picasso did it to some extent. My Skoda Octavia also does it
-
- Posts: 123
- Joined: 17 Nov 2018, 12:08
- Location: Norfolk uk
- My Cars: Xsara picasso exclusive 2.0 hdi MPV 2004
- x 11
Re: Quiet motor noise on a C5 when switched off
Maybe the same adage,,Does the light go OFF When you close the fridge door.lol.
-
OnlineGiveMeABreak
- Forum Admin Team
- Posts: 37006
- Joined: 15 Sep 2015, 19:38
- Location: West Wales
- My Cars: C3 Aircross SUV HDi Flair Peperoncino Red (The Chili Hornet)
C5 X7 2.0 HDi Exclusive Mativoire Beige (The Golden Hornet)
C3 1.6 HDi Exclusive Aluminium Grey (The Silver Hornet)
C5 MK II 2.0 HDi Exclusive Obsidian Black
C5 MK I 2.0 HDi SX Wicked Red
Xantia S2 2.0 HDi SX Hermes Red
C15 Romahome White
XM 2.0 Turbo Prestige Emerald Green Pearlescent
XM 2.0 Turbo Prestige Polar White
XM 2.0 SX Polar White
CX 20 Polar White
GS 1220 Geranium Red
CX 2.4 Prestige C-Matic Nevada Beige
GS 1000 Cedreat Yellow - x 5646
Re: Quiet motor noise on a C5 when switched off
Ignore it. It is in fact the EGR valve resetting to default position after the engine is stopped.detheridge wrote: ↑12 Feb 2019, 07:11 However, one curious thing that I've never encountered before is that when the ignition is off there's a quiet humming from behind the passenger side of the dashboard. You can only hear it with the doors closed. Obviously something's still running even after switching off and removing the key. It's not a fan in the engine, but it has been suggested to me that it could be one of the myriad relays behind the console, or something to do with the EGR valve. If I disconnect the battery it stops, but obviously I don't want to have to reconnect every day and reset everyhting on the Navidrive each time.
Please Don't PM Me For Technical Help
Marc
Marc
-
- Posts: 51
- Joined: 25 Nov 2013, 12:13
- Location: Ludlow Shropshire
- My Cars: '03 C5 2.2 Exclusive Estate.
In the past:
'07 C5 VTX+ 2.2. 170hp Estate auto
03 C5 2.0 Exclusive Estate.
95 XM 2.5D Exclusive
94 Xantia 1.9D Estate
92 XM 2.0i
90 XM 2.0
Various CXs (CX22, CX Pallas, CX GTi, CX Estate)
81 GSA Pallas
1974 DS23 Estate
1974 DS23 Pallas
1970 DS21 Pallas EFI - x 3
Re: Quiet motor noise on a C5 when switched off
Many thanks for the replies folks - I can breathe easly again! The thing was that this was new for me because my former 2003 C5 Exclusive (2.0 litre 8 valve) never did anything like this.
- myglaren
- Forum Admin Team
- Posts: 25367
- Joined: 02 Mar 2008, 13:30
- Location: Washington
- My Cars: Mazda 6
Ooops.
Previously:
2009 Honda Civic :(
C5, C5, Xantia, BX, GS, Visa.
R4, R11TXE, R14, R30TX - x 4889
Re: Quiet motor noise on a C5 when switched off
detheridge wrote: ↑12 Feb 2019, 10:26 Many thanks for the replies folks - I can breathe easly again! The thing was that this was new for me because my former 2003 C5 Exclusive (2.0 litre 8 valve) never did anything like this.
I had to fit a new headlamp bulb in mine a couple of weeks ago and heard something similar.
Ignored it and it went away
Engine will probably fall out now.
-
OnlineGiveMeABreak
- Forum Admin Team
- Posts: 37006
- Joined: 15 Sep 2015, 19:38
- Location: West Wales
- My Cars: C3 Aircross SUV HDi Flair Peperoncino Red (The Chili Hornet)
C5 X7 2.0 HDi Exclusive Mativoire Beige (The Golden Hornet)
C3 1.6 HDi Exclusive Aluminium Grey (The Silver Hornet)
C5 MK II 2.0 HDi Exclusive Obsidian Black
C5 MK I 2.0 HDi SX Wicked Red
Xantia S2 2.0 HDi SX Hermes Red
C15 Romahome White
XM 2.0 Turbo Prestige Emerald Green Pearlescent
XM 2.0 Turbo Prestige Polar White
XM 2.0 SX Polar White
CX 20 Polar White
GS 1220 Geranium Red
CX 2.4 Prestige C-Matic Nevada Beige
GS 1000 Cedreat Yellow - x 5646
Re: Quiet motor noise on a C5 when switched off
Depends on the engines / year / technology used. Later models and engines use a lot more of these electrovalves and with the addition of particle filters they are also used with regeneration.detheridge wrote: ↑12 Feb 2019, 10:26 Many thanks for the replies folks - I can breathe easly again! The thing was that this was new for me because my former 2003 C5 Exclusive (2.0 litre 8 valve) never did anything like this.
Please Don't PM Me For Technical Help
Marc
Marc
-
- (Donor 2017)
- Posts: 278
- Joined: 31 Oct 2017, 15:52
- Location: Glasgow
- My Cars: Citroen C5 Tourer 1.6 eHDi VTR+NAV
- x 59
Re: Quiet motor noise on a C5 when switched off
my mk2 C5, C4 and x7 C5 have all done this. I never worried about it, just thought it was the car getting ready for shut down.