Somebody in my trunk! - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 39 (permalink) Old 04-18-2008, 03:00 PM Thread Starter
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Somebody in my trunk!

Does anybody know what might cause a knocking coming from the back of the vehicle. It really does sound as if somebody was knocking on the trunk lid from the inside. The first time it happened when I just started the engine, just three knocks in quick succession. I shut it down and restarted, same thing. Then nothing for about two weeks and one morning it happened again when I started her up. This time I was able to determine itís definitely originating at the rear of the vehicle. I immediately thought, "fuel pump" although there has so far not been any effect on the engine's preformance. This afternoon when I got home and shut down, I remained in the car for about five minutes reading something from work when I heard it again, without the electrical on. Although it didnít sound as loud as before, it was four distinctive raps coming from the back end. Itís only happened about half a dozen times since late February, once while driving and rounding a turn (if that could mean anything). I plan on telling my dealer when I take it in for an oil change but Iíd like to have some kind of idea what it is when I do. Other then this the car runs like a dream. Any ideas out there?

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post #2 of 39 (permalink) Old 04-18-2008, 03:08 PM
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OMG I thought I was the only one hearing that! I don't know what it could be, but it really does sound like somebody knocking. Only thing I can think of is something or other heating up/cooling down, but I honestly don't know.


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post #3 of 39 (permalink) Old 04-18-2008, 04:00 PM
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I am pretty sure the fuel pump is in the back near the trunk.



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post #4 of 39 (permalink) Old 04-18-2008, 04:22 PM
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holy SHYT i hear it too!!!

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post #5 of 39 (permalink) Old 04-18-2008, 05:36 PM
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dude i hear it too!!!! i always freaked out but now i try to jump out of my car after i shut it off to hear where its coming from. it always happens about 20 seconds after my car turns off.

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post #6 of 39 (permalink) Old 04-18-2008, 06:03 PM Thread Starter
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At quick glance the first thing that came to my attention is our's are all '07s, anyway it's just an observation. I'm leaning towards the fuel pump, but the fact that I still heard it when I had the ignition off and no electrical power going to the pump makes me rethink.

You don't like your job, you don't strike. You go in every day and do it really half-assed. That's the American way. -Homer Simpson
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post #7 of 39 (permalink) Old 04-18-2008, 06:19 PM
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i have heard mine driving down the road... never when it is shut off tho

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post #8 of 39 (permalink) Old 04-18-2008, 06:51 PM
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Any of you guys have the premium sound package?????

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ill be the DRUNKEST mofo there btw can someone keep an eye on my kid while i go get another beer?
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post #9 of 39 (permalink) Old 04-18-2008, 08:36 PM
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Mine does it too. Some days it happens and some days it doesn't...I too have an '07.

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post #10 of 39 (permalink) Old 04-18-2008, 09:02 PM
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06 Cobalt

Mine does it too. I have an 06 Cobalt LT. I dont think it is the sound system because it used to do it when I had regular speakers in the doors and now it still does it when I upgraded everything on the inside of my car. It is always three knocks about 20 to 30 seconds after I turn the car off.
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