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Old 10-21-2010, 01:03 PM
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Exclamation GC 5,7 HEMI engine knock sound problem !!!

HI guys ,,

It's my first time posting a thread , and hope finding some solutions.

OK , I have a 2009 grand cherokee overland 5,7 HEMI engine
Made in Austria( WH export model since I'm in Saudi Aribia ).

The problem is when starting the car after been cooled down (about 3 hours) and start moving, A KNOCK SOUND APPEAR RIGHT WHEN SHIFTING FROM 1st TO 2nd GEAR !!
I went to the dealer ( under waranty ) and they say they are not catching the sound or source of it.
I forgot to mention no error codes appear.

Don't know if my ENGLISH is clear for you
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Old 10-21-2010, 05:36 PM
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Re: GC 5,7 HEMI engine knock sound problem !!!

I understand you mate.

Do you also feel a knock or are you just hearing it?

Is the shift harder than it should be?

Does it do this all the time?
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Old 10-21-2010, 06:42 PM
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Salam, good luck with the problem! Sorry I am of no help
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Old 10-21-2010, 10:45 PM
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Re: GC 5,7 HEMI engine knock sound problem !!!

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Originally Posted by Marlin View Post
I understand you mate.
Good to know.

Do you also feel a knock or are you just hearing it?
Sometimes I can barely feel it under my feet that's when the sound is stronger than ever.

Is the shift harder than it should be?
No , I think the shifting procedure is OK.

Does it do this all the time?
Not all the time , but almost.

Thanks & I appreciate your interest.
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Old 10-21-2010, 10:48 PM
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Re: GC 5,7 HEMI engine knock sound problem !!!

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Originally Posted by GR33N D3M0N View Post
Salam, good luck with the problem! Sorry I am of no help
Salam , and thanks for your reply.
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Old 10-21-2010, 10:51 PM
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Re: GC 5,7 HEMI engine knock sound problem !!!

My gut tells me you just need the PCM reflashed, or even just re-set.

There is a how-to on here somewhere on how to reset it yourself. Just do a search mate.
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Old 10-21-2010, 11:39 PM
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Re: GC 5,7 HEMI engine knock sound problem !!!

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Originally Posted by Marlin View Post
My gut tells me you just need the PCM reflashed, or even just re-set.

There is a how-to on here somewhere on how to reset it yourself. Just do a search mate.

I assume you mean by PCM is the computer of the car , if it's that , the dealer did reflash it but it's no use.

anyway , again I appreciate your help mate
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Old 10-22-2010, 12:15 AM
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Re: GC 5,7 HEMI engine knock sound problem !!!

The Powertrain Control Module.....

If you can, disconnect the battery overnight and see how that goes. It "wipes" the memory of the computer.
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Old 10-23-2010, 09:35 PM
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Re: GC 5,7 HEMI engine knock sound problem !!!

Thank you Marlin , I'll try it.
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