Facelift Beeping sound after turning off?

[Mark_86]

For some odd reason that I haven't figured out, when I turn my car off, I sometimes get a beeping sound. It's quiet, sounds like it's coming from the engine bay... anyone else have this or know what it is?


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[azibux1]

This is quite common if it is the same sound I'm imagining, with various cars. Quite a long beep / squeal potentially of varying tones / keeps coming and going within seconds?

Never really looked into what it might be.

 

[RichardT]

Count down to self destruction?

 

[lou15p]

Possibly the hydraulics


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[Svenedin]

I think I've heard the same sound when I've just gone to the car and opened the bonnet to top up the screen wash (not started the car). I don't know what it is but thought it might be a pump of some kind. Thought it slightly strange with a cold engine and without the ignition on. The only thing I could think of was that maybe the fuel pump pressurises the fuel system when the car is unlocked (and before the ignition is turned on) in preparation for starting -I have no evidence for this, it's just a guess (and probably wrong). Hopefully somebody can tell us what it is!

 

[Tom.H]

I've heard it on mine as well.

 

[HulkRS3]

Think it's the ECU talking to the car in some way, mine does it too. Lots of high pitched wines, squeals etc too.

 

[Svenedin]

Think it's the ECU talking to the car in some way, mine does it too. Lots of high pitched wines, squeals etc too.

Yes, that is exactly what it sounds like

 

[azibux1]

Think it's the ECU talking to the car in some way, mine does it too. Lots of high pitched wines, squeals etc too.

Yup that's it! Better description than mine lol

 

[Tom.H]

 

[Mark_86]

It just sounds like a few different length beeps to me lol. I wondered if it was something to do with the turbo?


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[SILVAF0XX]

I actually only just noticed this tonight in the garage... figured it was some alarm/immobiliser thing as I'd just locked the car.

 

[Rideen]

56k modem obviously guys.

 

[S32B]

56k modem obviously guys.

Ohh remember them with AOHell.

 

[Spinstorm]

lol it’s not the ECU - since when do computers sound like C3PO (as above). It’s either hydraulics/pump. My Golf R does the same sometimes.


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[richinsoton]

Quite often it can be fuel pumps priming or the car moving swirl flaps, ABS pumps or throttle bodies etc to check everything is correct / calibrated. Think of it like a pilots pre flight checks when they move the rudder etc.

 

[Ormesome]

Quite often it can be fuel pumps priming or the car moving swirl flaps etc to check everything is correct / calibrated. Think of it like a pilots pre flight checks when they move the rudder etc.

Yeah i thought fuel pump priming myself too. Happens on my diesel A3 so must be a part shared by all A3's and not engine specific.

 

[richinsoton]

Yeah i thought fuel pump priming myself too. Happens on my diesel A3 so must be a part shared by all A3's and not engine specific.

To clarify it'll be the lift pumps in the tank priming rather than the engine mounted high pressure one (which won't pump until the engine rotates). Under bonnet it could be the ABS pump priming.

After switching off could be an electrical coolant pump circulating the coolant.

 

[paradigital]

lol it’s not the ECU - since when do computers sound like C3PO (as above)

Two things. 1) C3PO spoke in an audible humanoid language 2) "as above" is R2D2

 

[Svenedin]

I was under the bonnet today. I needed to take off the engine cover to check which size socket is required to unscrew the oil filter housing (32mm) because I am considering doing a DIY early oil change. With the engine cover off the high pitched noise was much more obvious. It carried on for a few minutes and then stopped. Seems to be to do with fuel pump but it's certainly engine related.