buzz from the pcm with the key on???

kbobob · Post by **kbobob** » Sun Mar 11, 2007 4:14 pm

hey has anyone else noticed a buzzing or humming coming from the pcm when the key is in the on position.

plugged in an extra pcm ....turned the key to the on position(was gonna leave it on for a while)....but heard this humming/buzzing sound, quite noticeable. so plugged my pcm in and it does the same thing.....just wondering if this is a normal thing, never noticed it before.

60trim · Post by **60trim** » Sun Mar 11, 2007 4:21 pm

Buzzing? sure its not the starter? or maybe the fuel pump pressurizing the system? Never had that happen to me.

Panhead · Post by **Panhead** » Sun Mar 11, 2007 4:44 pm

you are probably hearing the humming/buzzing noise from the fuel pump on the on position. it stays on for a few seconds. other than that, i didnt hear a humming/buzzing noise from my pcm.

kbobob · Post by **kbobob** » Sun Mar 11, 2007 4:47 pm

yeah...with the hood open its coming from the pcm area......so...would really doubt its the other things

hansken_yo · Post by **hansken_yo** » Sun Mar 11, 2007 5:54 pm

mine does that hum right before I start the engine... I always thought it was the feul pump.. I guess it could just be the drivers starting up too.. I can hear my hard drive in my computer spin up and then it goes quiet like....

underway · Post by **underway** » Sun Mar 11, 2007 10:27 pm

ya dude im sure its the fuel pump... but sumone said the humming goes away...mine never does.....does this mean mines no good?

03blackrt · Post by **03blackrt** » Sun Mar 11, 2007 11:32 pm

I get the same thing too with my '02. None of my other four neons did it though. It is definitly not the fuel pump. It almost sounds like a short circuit. I just ignore it.

snkmug · Post by **snkmug** » Mon Mar 12, 2007 12:43 am

its common for the pcm to buzz, some do it some dont...

Cbussilver01es · Post by **Cbussilver01es** » Mon Mar 12, 2007 3:44 pm

I had the same thing happen in my 1gn, I couldnt tell you what it was tho.. So far I hasnt happened to my 2gn.

Thunderstruck · Post by **Thunderstruck** » Mon Mar 12, 2007 3:56 pm

My 96 Neon used to have a high pitched whine when you shut it off. My 05, nothing.