Suspension components: Worn or damaged suspension components, such as shock absorbers, struts, control arms, and ball joints, can cause squeaking noises when they move over bumps. This is because they are no longer able to properly absorb the impact of the bumps, and the friction between the parts causes the squeaking sound.
Anti-roll bars: The anti-roll bars in a car's suspension system can also cause squeaking noises if they are not properly lubricated or if the bushings that hold them in place are worn out.
Body panels: If the body panels of a car are not properly aligned or secured, they can rub against each other and cause a squeaking noise when the car goes over bumps.
Interior trim: Worn or damaged interior trim pieces, such as the dashboard or door panels, can also cause squeaking noises when the car goes over bumps.
Brake components: Problems with the brakes, such as worn brake pads or a loose caliper, can also cause squeaking noises when the car goes over bumps.
When it is not immediately clear which one caused the noise, It's often a good idea to get the car inspected by a professional to locate the exact source of the squeaking noise and make necessary repairs to eliminate it.
