What is the cause of the slight clunking noise in the BMW X5?
2 Answers
It may be caused by a transfer case malfunction. Here are the relevant details: 1. BMW: BMW, the Chinese full name being Bavarian Motor Works, is a German luxury automobile brand. BMW's vehicle series include the I, X, Z, and pure numeric models, as well as the 1, 2, 3, 4, 5, 6, 7, and 8 series, along with the M series, which is based on improvements to the various series. 2. Transfer Case: The transfer case is a gear transmission system whose input shaft is directly or through a universal drive device connected to the second shaft of the transmission. It has several output shafts, each connected to the drive axles via universal drive devices.
My BMW X5 has a slight knocking sound, and I always feel a rhythmic small noise coming from underneath the car body, especially noticeable during low-speed turns or when going over speed bumps. This is most likely an issue with the suspension system, such as worn-out control arm bushings in the front suspension—when the rubber parts crack, the loose components collide and produce noise. It could also be due to loose caliper bolts in the brake assembly or worn universal joints in the drive shaft, causing imbalance and knocking sounds when the shaft rotates. I suggest first identifying the sound's location: if it only occurs when turning, check the tie rods first; if it happens during braking, inspect the brake pads. It's best not to delay too long, as these parts in older cars can deteriorate easily, affecting safety. For a quick check, you can jack up the car and shake the tires to see if there's any looseness. Of course, for a thorough solution, it's best to take it to a professional repair shop where a mechanic can diagnose it with tools—BMW models have complex electronic systems, and DIY attempts might make things worse. Addressing it promptly can prevent bigger issues and extend the car's lifespan.
