2004 Buzzing Sounds

I have a 2004 that has a barely audible buzzing or beeping sound while running, very high pitch. No Lights and no codes. When you turn the key off it beeps a couple of times and then you can hear a relay shut off and it stops after a couple seconds. It does have an EGR delete on the engine. Anyone else experience this? Video of sound is down a couple replies.

Could it be your "aux heater"? Ours has a pretty high pitch to it if we have it on. When turning the van off, it continues to run just for a little bit.

I have not used the aux heater yet, so I don't think that is it. Also, it changes from a whine to a beep when the key is turned off. Thanks for the suggestion thou!

The LP fuel pressure relief valve is known to make a howling/moaning sound...
Annoying but harmless (and relatively easy to RnR).
-dave

https://www.youtube.com/watch?v=wJJ4-KuDdTA

Thanks for the reply, but it is definitely an electrical noise and it beeps when it is turned off. I will try and get a recording of it...thanks for your input!

Check your mass air flow sensor. Mine emits high pitch after shutdown.



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Here is a sample of the sound, easiest to hear when the ignition is shut off and it starts beeping. Thanks

https://www.youtube.com/watch?v=0oNWv4Q3JgU

Hmmm. My 2004 has never made a noise anything like that.
Do you have any 3rd party devices?
Perhaps your stereo is picking up interference?
You could pull the stereo fuse (10amp, #15, right side) under the steering column and see if it stops.

-dave

Mine did that at one point... unfortunately I forget what else changed to make it stop (or did it ever? I don't remember).

Either way, it was harmless, but annoying.