While car is in motion, a loose sound coming from the rear, as if something is loose and knocking around in the trunck. Checked trunck and everything is tied down. This knocking is getting louder as time passes. (rear axle, shock, etc.?????) This started after sitting for a full day in the rain. The next day, it was rattle & clunk.
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One possible cause is a drum that is out of round and / or loose brake shoes. Another could be a loose backing plate or suspension mount.
Have you had the brakes checked ?
if the knocking is occurring while vehicle is in motion it can be a driveshaft cv joint bad..if it occurs while not moving but in gear, it could be the exhaust rattleing under the car..may also be the front end suspension bushings worn..
Open trunk and inspect rubber weatherstripping,something could be in the way when it is shut causing the weatherstrip not to seal or it's coming loose.Close trunk,get waterhose,water trunk and see actually where it's leaking.
It is likely that you have worn rubber bushing in one or more of the suspension control arms, check them all. Also check for loose suspension bolts on all control arms. Have you checked the free play of the wheel?
If the ABS light comes on immediately it likely has something to do the actual ABS control unit. Those are expensive, ask the place that did the work if they made any adjustments. Typically ABS control systems should only be serviced by the OEM. If the light comes on when you are driving, or if there is a catastrophic short in one of the wheel sensors it would also cause this and be far cheaper. Since the traction control light is also coming on it may very well be a wheel sensor since the same sensor is often used to detect wheel slippage and motion stop (for traction and ABS). The sensor price varies, for my Chevy Corsica is was 60+ for the front ones, and a lot for the rear since the sensor was housed in the hub. (if you have disc brakes in the rear, the price should be the same. i own a repair shop,and its not as bad as it sounds on this one,it could just be maintenance reminder on it causing this to happen they will do this ever so many miles,but i would have it checked,because when they was doing the brakes on it they might have hit a sensor and knocked a wire loose on it or something,but its not a big major thing with it,but take it back and have it checked,at this time there would be no way as to guess the cost of fixing it,if its a loose wire,probably 0 cost on it,but have it checked to be sure,good luck i hope this helps
If the vehicle is on, but not moving, the only thing in that area that would be "in motion" and capable of causing a 'knock' is the electric fuel pump. That should be your problem. The only other possible cause would be if you have some sort of electric/computer controlled ride system which is trying to pump up and is making a knocking sound. There is nothing else in that area of the vehicle that can cause that when you are parked.
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