Has a Solution Been Found for the Low-Frequency Resonance in the 2021 Volvo Models?
2 Answers
The solution to Volvo's low-frequency resonance issue involves installing high-efficiency soundproofing cotton to reduce noise. Below are the relevant details: 1. Low-Frequency Resonance: The principle of low-frequency resonance occurs when sound waves transmitted through the air reflect off the car body, creating low-frequency resonance. Certain frequencies of reflected sound waves align with the vibration direction of the original sound, amplifying that frequency. Conversely, other frequencies may have reflected waves that oppose the original sound's vibration direction, thereby weakening those frequencies. 2. Noise Frequency: Since low-frequency vibrations and noise frequencies are close to those of human organs, they can cause resonance, significantly impacting internal organs. Prolonged exposure can lead to irreversible damage to the heart, lungs, spleen, kidneys, and more. Some sensitive individuals may experience adverse reactions such as headaches, palpitations, and brain swelling. This can also have long-term effects on mental health.
I've been repairing cars for over ten years, and the low-frequency resonance issue in Volvo's 2021 models is indeed quite troublesome, especially in models like the XC60 and S90. There's a noticeable humming noise at low RPM ranges that causes ear pressure. This problem likely stems from the overlapping vibration frequencies of the exhaust system or engine mounts. Solutions have progressed since 2021, with Volvo officially releasing a technical notice recommending owners return to authorized dealerships for a TCM software upgrade to optimize transmission control. Alternatively, adding soundproofing materials under the carpet and in the trunk can reduce noise transmission. Some owners have shared that reinforcing suspension mounts or modifying exhaust hangers also helps. In short, don't delay—early inspection and resolution will save you from frustration on long drives.
