What causes the rear seat vibration in the BYD Song Plus DMI?

[IvanRose]

Song Plus DMI rear seat vibration is caused by the poor performance of the shock absorbers. The BYD Song Plus DMI is a highly impressive compact hybrid SUV under the BYD brand, and it is the hybrid model in the Song Plus series. Smooth and linear acceleration: During normal driving, the vehicle exhibits the advantages of an electric car, with smooth and linear acceleration. Significant advantages: The vehicle operates very quietly in pure electric mode, combining the characteristics of an electric car with the range advantage of a fuel-powered car. Strong power: Whether on highways or long uphill mountain roads, the vehicle performs exceptionally well, especially in terms of front-end power from 0 to 100.

[FrankMarie]

Last time I drove the Song Plus DM-i on a long trip with my family, we experienced vibration issues in the rear seats. I specifically went to the 4S store to have it checked, and the technician said it was caused by power transfer during the switch between the engine and electric motor. Hybrid vehicles may have slight jerks when switching between battery power and engine engagement, especially noticeable during deceleration and re-acceleration. Additionally, loose rear seat mounting clips can amplify the vibrations—in my case, it was a clip issue plus the detachment of the driveshaft balancing weight. It's recommended to focus on checking three areas: whether the screws on the chassis guard plate are loose, the condition of the motor mount rubber bushings for aging, and the tire dynamic balance data. If vibrations are detected, it's best to address them promptly to avoid potential wear on the half-shafts.

[VonDonovan]

With over a decade of repair experience, I've identified three common failure points for rear seat vibration in Song DMi. First, unbalanced driveshafts – especially noticeable during high-speed rotation where vibrations transmit to the rear. Second, aged rear subframe bushings – cracked rubber leads to failed damping. Third, loose bolts at seat frame-body connection points. Additionally, pay attention to engine start-stop logic – stronger vibration occurs during forced engine starts at low battery levels. Try turning off the AC compressor as compressor vibration can transmit through the body. For such issues, always inspect the chassis using a lift – don't just replace tires or perform wheel balancing.

[LeCharlie]

I drive the Song Plus to take my kids to school every day and have particularly noticed vibrations in the rear seats. They are most noticeable during cold starts and when climbing hills, resembling the buzzing of a phone in vibration mode. The manual suggests it might be a calibration issue with the hybrid system, where torque fluctuations from the motor are transmitted to the body. Additionally, I found that placing heavy items in the trunk worsens the vibrations because the rear suspension springs compress and deform. During a recent maintenance visit, the mechanic adjusted the height of the engine mounts, which significantly reduced the vibrations. It's also recommended to check if the tire pressure is consistent and if the spare tire is securely fastened, as these details can have an impact.

[MicahDella]

As a hybrid car owner, I've researched rear vibration issues. There are three main dimensions: powertrain level - torque fluctuations during the coordinated operation of dual motors and the 1.5L engine; chassis level - bushing wear in the multi-link suspension makes vibrations more noticeable; assembly level - loose battery pack mounting brackets can cause resonance. Last time, the vibration in my car was caused by deformation of the rear drive motor mounting bracket, which was resolved after replacement. When troubleshooting, it's best to connect an OBD scanner to check motor speed fluctuation data rather than replacing parts blindly.

[ParkerFitz]

After driving the Song Plus for two years, I noticed that the rear vibrations come in two types: high-frequency and low-frequency. The low-frequency rumbling is usually caused by tire deformation or out-of-round wheels—I experienced this after patching a tire without doing a wheel balance. The high-frequency, fine vibrations are often due to motor bearing issues or excessive gear clearance in the reducer. I remember one time after driving on a rough road, the vibrations worsened, and an inspection revealed that the battery pack guard plate had deformed and was pressing against the frame. Here are some habits I recommend: check the screws on the underbody guard plate after driving on bumpy roads; inspect the motor mounting bracket every 10,000 kilometers; and avoid letting the battery level drop below 15% during charging to prevent forced startup vibrations.