Why Does the Car Make a Squeaking Sound While Driving?

[JulietLynn]

Here are the reasons why a car makes a squeaking sound while driving: Sound from the belt: Generally, this indicates that the friction coefficient of the belt surface has significantly decreased, and the belt is excessively worn. If the sound occurs when the vehicle is under load, observe one of the drive belts. You may notice that the resistance or tension on the belt automatic tensioner or the belt tensioner pulley abnormally increases. Most belt automatic tensioners have a set of belt wear length indicators somewhere along the sliding direction between the bottom of the tensioner and the tensioner arm. This indicator consists of a pointer and two to three marks, indicating the working range of the belt tensioner. If the pointer exceeds this range, the belt is likely overstretched and should be replaced. Sound from the flywheel bearing: This has a significant impact on the car's performance, but the main technical performance can still be maintained in the short term. Such sounds are usually loud, and the wear on the components is also considerable, so timely repair is necessary. If such sounds occur during driving, they can be temporarily ignored. Malignant sounds, such as severe noise from the crankshaft bearing or connecting rod bearing accompanied by a drop in oil pressure, significant gear impact noise from the transmission, or strong vibration noise from the differential, have a serious impact on the car and may cause or have already caused severe damage to the components. Such faults must be taken seriously, and the car should be stopped immediately for inspection. Do not continue driving under any circumstances, as this could easily lead to major mechanical accidents.

[PrestonAnn]

I also encountered squeaking noises while driving last year, which was quite annoying at first. The sound usually comes from worn brake pads, as the small metal tabs on them are designed to make noise when the pads are worn to their limit. It could also be a belt issue, like when the alternator belt ages and becomes loose, causing friction noises that are more noticeable during RPM changes. Additionally, don’t overlook the suspension system—especially the rubber bushings on the shocks of older cars, which can crack and squeak on bumpy roads. A mechanic friend also mentioned that lack of lubrication or wear in the ball joints of the steering system can produce similar sounds. I’d recommend checking the brake pad thickness and trying to pinpoint where the noise is coming from. If you can’t tell, just take it to a repair shop—they can easily locate the issue with a lift. Don’t delay, as it could increase safety risks.

[DeJonathan]

Last time when I just started my car, it made a squeaking sound, like a small animal chirping. I specifically went to the 4S dealership to ask about it, and the technician said these are the common culprits: First, the brake disc surface is rusty or has sand particles stuck to it, causing a sharp noise when braking; Second, the engine belt has aged, the rubber hardened and slips, creating friction noise; Third, the plastic underbody shield is loose, scraping against the chassis when going over bumps; Fourth, it might be the aging window seals, although the sound is not obvious, it can still be bothersome at higher speeds. Another easily overlooked cause is unsecured items in the trunk, making noise when swaying during turns. In short, it's best to determine the issue based on when the sound occurs, such as during cold starts, braking, turning, or driving at a steady speed on flat roads, as different situations correspond to different problems.

[DelLeo]

I've been driving for over 20 years and have heard countless squeaking sounds. The most common issues are with the suspension system, especially rubber bushings and control arm ball joints—they'll squeak once they age and crack. Pay special attention to the belt system as well; insufficient tension or cracks in the belts for the AC compressor and alternator can cause noise. The braking system also needs checking—loose brake pad return springs can lead to friction. Additionally, small stones stuck in tire treads can create a tapping sound, which is easily confused with mechanical noise. If you notice unusual sounds, don't rush onto the highway. Park on level ground and check if all four wheels have the same temperature. If a wheel hub is scalding hot, the brake caliper might be stuck, which requires immediate attention.