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Unknown Sound

LMWT

Ready to race!
Another question I have re. my Golf Mk8 Diesel:

Car is parked and locked at my house - when I go outside (no car fob) to check on things, especially at night when it's very quiet, I approach or walk past the car I hear what sounds like a quick Shhhhhhh, a valve releasing air pressure or maybe a relay operating, it repeats maybe three times and that's it. Any ideas on what that sound is?
I think myself maybe it's something to do with the central locking and maybe it causes the battery to loose voltage - pure speculation :confused: made a recording of it but cannot attach it.
 

Carlosfandang0

Drag Racing Champion
I noticed mine was making random clicks or whirring noises in similar situations when the key was not present, I presumed it’s the auxiliary water pump doing its thing, whatever it is, in my case it hasn’t effected the battery in any way.
 

LMWT

Ready to race!
Thanks for the reply, your description of the sound is spot on. After taking it for granted up to now and desperately looking for what is causing the constant errors popping up and the battery voltage issue, thought it might have something to do with those - bad battery voltage = not enough power to run certain features.
Normally my car fob is quite close to the car when parked at my home, tonight I removed it from that usual position - further away, walked out and approached the car - no sound, put the fob back to its usual position, approached the car and the sound occured. Is there a link, does this mean anything - I don't know, will bring it up with the dealer next week. Final note I'm not sure that even the VW dealers understand the mysteries that the MK8 throws up for some owners :unsure:
 

Carlosfandang0

Drag Racing Champion
It may well be that the key is not shutting down or is still within range and has been disturbed before you hear the noises, I’ve left my key indoors reasonably close to the car in the past and have noticed the the cars lights come on as I walked past the key that happened to be sat inside on a table near the front door, that table sometimes wobbles due to dodgy floorboards, in my case this probably activated the key and prompted the headlights to come on as I walked past the table, the key is usually kept further away from the car though, if you cannot keep the key elsewhere perhaps consider placing the key in a faraday pouch or box, my spare is always kept in a faraday pouch as it doesn’t get used, it may not be necessary as it kept quite a distance from the car, but in my mind it means that key is ‘shut down’ and as I already had the pouches from my previous keyless mk7 I use it anyway, I did initially keep the main key in a pouch to but stopped doing so when I realised these latest keys turn off if not moved for a few minutes, as mentioned, I generally keep this key away from the car and have had zero car battery issues, anybody that is having car or fob battery problems/drain should probably look at where they keep the key, and how often it may be disturbed in that location while not ‘in use’, the red light on the key will rapidly flash if it is currently communicating with the car, even if within range this flashing will stop after a couple of minutes if the key is not disturbed thus stopping communication, but if disturbed before you went to the car it would wake the car up, hence the noises, pay attention to the light on the key before you go outside and in what instances it’s flashing, you’ll soon work out what’s going on, but as I said, a faraday pouch will stop communication even if the key is disturbed thus saving the cars battery if this is happening very regularly.
This is the pouch I use, there are many other types available but I can only vouch that these block the signal.
https://www.ebay.co.uk/itm/28438586...p2LCNeJSEm&var=&widget_ver=artemis&media=COPY
 

LMWT

Ready to race!
Thank you for the super reply :)

Firstly can I state that I use one of these - https://www.amazon.co.uk/kwmobile-Cover-Compatible-Golf-Button-black-white/dp/B08JLRPQM3/ This particular cover doesn't show the flashing red LED light. I will get one of those pouches or a faraday box for future use.

From your reply I will change my key arrangement, thing is I have my back door house key on the same keyring as the fob and always park the car at my back door, lock it, lock the house door and leave the keys in the door until bed time, hence anytime I go outside the key moves and obviously "wakes up" the car. From now on I will keep the car fob separate from the house key and see how things go re. that sound (still would love to know what it is exactly)
Unfortunatley this wouldn't explain all the error messages I continue to get on the car - some would appear as soon as I started the car at home but most appear after driving maybe sixty or seventy km - no set pattern / location for any of the occurrences.
Thought the fob issue might explain the battery voltage warning but if that was the case why has this only happened twice at the house (have the car fourteen months now and had a battery replaced some months ago) :unsure:
 

SRGTD

Autocross Newbie
From now on I will keep the car fob separate from the house key and see how things go re. that sound (still would love to know what it is exactly)
it could be the sound of the fuel pump pressurising the fuel system. Normally, this happens when the driver’s door in unlocked and / or the driver’s door is opened after the car has been parked up for some time (e.g. overnight).

With VW’s latest ‘sleeping’ key fobs, pressurising the fuel system might happen when the key fob is ‘woken up’ and is in range of the car, rather than when the car’s unlocked and the door opened - the assumption being that moving the key fob waking it after a (long) period of inactivity means the car is going to be used, so it pressurises the fuel system in readiness for starting the car.
 
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LMWT

Ready to race!
it could be the sound of the fuel pump pressurising the fuel system. Normally, this happens when the driver’s door in unlocked and / or the driver’s door is opened after the car has been parked up for some time (e.g. overnight).

With VW’s latest ‘sleeping’ key fobs, pressurising the fuel system might happen when the key fob is ‘woken up’ and is in range of the car, rather than when the car’s unlocked and the door opened - the assumption being that moving the key fob waking it after a (long) period of inactivity means the car is going to be used, so it pressurises the fuel system in readiness for starting the car.
Thanks SRGTD,
Your second paragraph makes great sense as I wouldn't be actually unlocking the car, just checking things out.
Going to keep the key fob away from the car in future and see how things work out 🙂 I'll be back!
 
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LMWT

Ready to race!
Thanks SRGTD,
Your second paragraph makes great sense as I wouldn't be actually unlocking the car, just checking things out.
Going to keep the key fob away from the car in future and see how things work out 🙂 I'll be back!

Carlosfandang0 & SRGTD

Final word on this, thanks to both of you for explaining the possible source / reason for that sound, convinced now that it as SRGTD wrote - the fuel pump pressurising the fuel system. Did my experimenting with the key fob as before - close to the car always and then kept at a distance.
With the key fob in the house but close to the car and disturbed, I go outside, approach the car the sound occurs, repeat with the fob removed no sound - convincing results. What I did find also is that when the engine is still hot from a journey there is no sound in either case meaning I suppose the fuel system is still ready for another engine start.

Probably a piece of useless information for most MK8 diesel drivers, but it got me thinking re. the low battery voltage I have had recently, a lot of approaching the car without driving might well have a bearing on the problem!
 
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