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Old 02-22-2013, 03:57 AM   #1
Senator Atkins
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Question Knocking Noise in the Rear - 2013 2LT Auto

Hey Guys...

This only happens once in a while, so I haven't discussed it with the dealer yet. Not being able to duplicate the noise on command will certainly make this an up hill battle, unless I get my ducks in a row.

On colder days, when I'm puttering around town... At lower speeds on neighborhood streets, or in a parking lot... There is sometimes a knocking sound from the rear.

It goes: Knock....... Knock...... Knock.Knock.Knock.Knock.Knock.Knock.Knock.

It's always the 2-3 inital knocks, followed by a series of 6-10 quick repetitive knocks.

Has anyone had this problem? Any suggestions?

Thanks,

Senator
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Old 02-22-2013, 06:33 AM   #2
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Sounds like the clutch packs by your description. Call the dealer and explain the issue. See what they say.
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Old 02-22-2013, 07:39 AM   #3
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Does this always happen within a few minutes of starting?

There is a brake self-calibration sequence that sound like what you are describing. It happens only once in a while.
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Old 02-22-2013, 11:05 AM   #4
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Quote:
Originally Posted by Rock-It Man View Post
Does this always happen within a few minutes of starting?

There is a brake self-calibration sequence that sound like what you are describing. It happens only once in a while.
It only happens once in a while. So is the calibration thing normal?
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Old 02-22-2013, 11:06 AM   #5
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Originally Posted by Hannibal View Post
Sounds like the clutch packs by your description. Call the dealer and explain the issue. See what they say.

Thanks man! I will mention it to them!
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Old 02-22-2013, 03:22 PM   #6
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Quote:
Originally Posted by Senator Atkins View Post
Hey Guys...

This only happens once in a while, so I haven't discussed it with the dealer yet. Not being able to duplicate the noise on command will certainly make this an up hill battle, unless I get my ducks in a row.

On colder days, when I'm puttering around town... At lower speeds on neighborhood streets, or in a parking lot... There is sometimes a knocking sound from the rear.

It goes: Knock....... Knock...... Knock.Knock.Knock.Knock.Knock.Knock.Knock.

It's always the 2-3 inital knocks, followed by a series of 6-10 quick repetitive knocks.

Has anyone had this problem? Any suggestions?

Thanks,

Senator
Senator Atkins,

I’m sorry you are experiencing this issue. I have researched my resources; however, there are currently no known “knocking” issues available at this time. I second the advice of “Hannibal”, have your dealer take a quick look.

Please keep us posted.

If you have additional questions or concerns, please feel free to contact me.

Louis (assisting Brandon)
Chevrolet Customer Service
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Old 02-22-2013, 03:28 PM   #7
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If I remember correctly, someone here described it as the gas tank vacuum self check. You won't hear it with a full tank though, only at some point when you have less than a full tank.

I just call it the tapping of my kidnap victims in the trunk
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Old 02-22-2013, 03:32 PM   #8
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Ah, the better technical answer....

It's the EVAP system doing diagnostics

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Old 02-23-2013, 06:13 AM   #9
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These cars do not have a baffle in the fuel tank. At low speeds when you have half tank or less, the gas will smash around in the tank and create a very pronounced knocking sound inside the car. It certainly has a liquid sound if you listen beyond the initial "knock" sound. The best way to eliminate the far worse clutch pack issue suggested, is to stop the car (with half tank or less) and see if you hear the knocking sound immediately. If you do, it's extremely likely to be just the fuel slamming the tank, which is normal.
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Old 02-23-2013, 09:42 AM   #10
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while my lemon was in the shop a bunch i had the ...well not an honor but the chance to drive most of the chevy fleet and I can tell you they all do it.
So +1 for it not apparently bieng an issue.
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Old 02-26-2013, 11:03 PM   #11
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I hear this noise also.
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Old 11-20-2013, 11:40 PM   #12
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same here on my 13 LS3 M6 with 3k miles. just noticed it today
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Old 11-21-2013, 05:40 PM   #13
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Originally Posted by mongooseboy000 View Post
same here on my 13 LS3 M6 with 3k miles. just noticed it today
mongooseboy000,

Sincere apologies to hear about the knocking noise on your 2LT. Any frustration this causes is certainly understandable and I understand you're seeking community opinions and responses here. If needed, feel free to message us privately and we'll exhaust our options to help resolve your concerns.

William R.
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Old 11-21-2013, 09:10 PM   #14
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Originally Posted by Chevrolet Customer Svc View Post
mongooseboy000,

Sincere apologies to hear about the knocking noise on your 2LT. Any frustration this causes is certainly understandable and I understand you're seeking community opinions and responses here. If needed, feel free to message us privately and we'll exhaust our options to help resolve your concerns.

William R.
Chevrolet Customer Care
Thanks, i have an appointment tomorrow. hopefully they can shine some light on it so i can relay it to the fellow members here and help out if possible
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