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Question DetailsAsked on 10/18/2013

I can hear knocking sound at the rear end of my car, what causes it?

my car is a 2004 sunfire Pontiac with about 129,000 on it. The front struts, shocks and stabilizer bushing has been replaced last 2 months ago. At first the knocking sound ceased but after sometime it came back. The sound is prominent while stepping on the brakes, and also while turning either left or right.

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2 Answers


Assuming you have nothing hanging down under the car and dragging, or something rolling around in the trunk or a loose spare tire:

Could be a lubrication failure in the differential or the universal joints or a loose axle, but since it occurs more when braking or turning my first guess would be a wheel bearing, as it would be under the most load at those times - would be a repetitive noise while turning in most cases.

If only one knock one any given turn or stop, could be loose or badly worn suspension system parts.

One other possibility would be loose lug nuts or a wheel mounted loosely - like it was tight on the hub but cockeyed when the lug nuts were tightened, so the wheel wobbles a bit. If you know how to change a tire, jack it up, remove tire/wheel, look for wear on the inside edge of the wheel and at the lug bolts and lug bolt holes in the wheel, then if no severe wear there put back on - be sure it is tight to the hub or drum before tightening nuts.

If not a loose wheel, I would recommend taking it to a general auto repair shop, or to a GM dealer if you go to dealers for your repairs. If not loose or poorly mounted wheel, then will likely require pulling rear hubs or drums and maybe disassembly of axle, so not a minor job - I would guess, very roughly, in the $300+ range to possibly much more if a differentiall problem.

Answered 7 years ago by LCD


I would let the guy out the trunk. LOL!

Answered 5 years ago by Guest_9234115

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