Why has the in-car Bluetooth sound quality suddenly deteriorated?

[VonCassandra]

Here are the reasons why the in-car Bluetooth sound quality has suddenly deteriorated: Poor design structure: If the signal is not intermittent or has noise, then it is not a Bluetooth signal issue. Poor sound quality is mainly due to inferior speakers and an unreasonable internal design structure of the cavity. Low Bluetooth chip version: Using a low version of the Bluetooth chip, during digital signal transmission, because the protocols are different, the output analog signal has already altered the original sound. Many domestic brands manufacture in-car Bluetooth headsets only for making and receiving calls, and they are mono, so don't expect in-car Bluetooth to deliver the same effect as wired headphones.

[VanAmelia]

I noticed the sudden degradation in Bluetooth audio quality in the car, which is typically related to several key factors. Bluetooth signals are susceptible to electromagnetic interference—for instance, when multiple Wi-Fi routers or microwave ovens are operating nearby, the connection between your phone and the car’s system weakens, causing audio distortion. Another common issue is a malfunctioning phone Bluetooth module, possibly due to software conflicts or incompatibility after an app update. I’d recommend restarting the phone’s Bluetooth. Additionally, a loose antenna or aging circuitry in the car’s system itself can degrade audio quality, so it’s worth checking the vehicle’s electronic components. Environmental factors also play a role; weak signals in tunnels or high-rise areas may improve by placing the phone near the dashboard. Don’t delay addressing this issue, as it could impact driving safety. Prompt troubleshooting or consulting a professional can prevent bigger problems.

[Luna]

My car's Bluetooth suddenly started making a hissing sound when playing music, which really annoyed me. That day while driving and listening to music, the sound quality suddenly became terrible, like it was crackling. At first I thought it was a phone issue, but after reconnecting a few times it got slightly better, though not completely normal. Later I realized it might be due to signal interference in the parking lot, or my phone's Bluetooth settings automatically reducing quality to save power. Sometimes the car's infotainment system needs a soft reset - turning the ignition off and on can restore signal strength. Another lesson is that Bluetooth transmission becomes unstable when phone battery is low, easily degrading audio quality. My suggestion is to keep devices updated, stay away from interference sources, and ensure reliable connections. Fixing this early means fewer noise distractions to ruin your driving mood.

[MacAiden]

When the car Bluetooth audio quality deteriorates, quickly check these points. I found that unstable Bluetooth on the phone or app crashes are the main causes—turning Bluetooth off and on again often solves it. Poor positioning has a big impact; weak signals make the sound muffled, so moving the phone to the front of the car helps. Low battery can also degrade audio quality—try charging it. Full device storage or outdated software are potential issues—clear memory or update the system. Interference from nearby Bluetooth devices can be resolved by turning them off. After fixing, maintain regularly, like cleaning connection ports to prevent aging. These small steps save time and won’t delay your drive.