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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 1667
Experience:  GM Grand Master Technician 2007. 14 year experience.
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MY 2005 HAS A THUMPING NOISE PARKED NOT PARKED, SOMETIMES,

Customer Question

MY 2005 HAS A THUMPING NOISE PARKED NOT PARKED , SOMETIMES , SOMETIMES AND THEN QUITS. IT APPEARS TO BE IN THE RIGHT REAR PANEL AREA INSIDE. I HAVE LOOKED UNDER THE CARRIAGE. UNDER THE COMPARTMENT ALL THROUGHT THE BACK ARE . THERE IS NO PATTERN.
HAVE AN IDEA?
Submitted: 11 months ago.
Category: GMC
Expert:  FIX IT MAN replied 11 months ago.

Hello, my name is Bobby. Thank you for the question. Can you tell me if it makes the noise only from the rear? Does it do it as it sits with the vehicle off also?

Customer: replied 11 months ago.
NO ONLY WHEN I TURN THE ENGINE ON
Expert:  FIX IT MAN replied 11 months ago.

Okay. So the clarify, if the engine is running you get a knocking from the rear of the vehicle? Is it a constant and rhythmic knock or does it occur every now and then?

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