Can the Rear Seat Vibration in BYD Song Plus DM-i Be Resolved?

[StBentley]

BYD Song Plus DM-i rear seat vibration is a manufacturing issue that cannot be resolved. Below is a detailed introduction to the BYD Song Plus DM-i: 1. Exterior: The front fascia features a large-sized grille with silver chrome trim. The side profile adopts flowing line designs, presenting a dynamic and stylish overall appearance. 2. Dimensions: The BYD Song Plus DM-i measures 4705mm in length, 1890mm in width, and 1680mm in height, with a wheelbase of 2765mm. 3. Powertrain: Equipped with a dedicated 1.5L Xiaoyun plug-in hybrid engine, delivering a maximum power of 110 horsepower and peak torque of 135Nm. For the battery, the BYD Song Plus DM-i utilizes Blade Battery technology, offering two versions with pure electric ranges of 51km or 110km.

[StAnna]

Last time I worked on my friend's Song Plus DMI, I encountered the rear vibration issue and spent quite some time figuring out the cause. The most common reason for this is improper tire dynamic balancing—missing wheel weights or incorrect tire pressure can easily cause vibrations. Hybrid cars have an additional quirk: if the engine speed is unstable during startup, the vibration can be particularly noticeable. The solution is straightforward. First, take it to a professional shop for a four-wheel dynamic balance, and remember to clean even the mud inside the wheel rims. Also, ask the technician to update the transmission software to the latest version—post-upgrade, the engine engagement is much smoother now. If the vibration persists, check the rear suspension for oil leaks, and tighten any loose seat buckles yourself with a wrench. As a last resort, adding a soft seat cushion can solve the problem for just around a hundred bucks.

[ElliotLee]

Having driven the Song Plus DM-i for over two years, I've deeply experienced the rear seat vibration issue. Initially, I thought it was due to uneven roads, but later noticed the vibration was particularly noticeable during the low-speed transition from charging to driving. After some research, I found that the DM-i system frequently starts and stops the engine at low speeds, transmitting vibrations through the chassis to the rear seats. The solution involves several steps: First, visit the 4S shop to request an upgrade of the electronic control program, as the new version optimizes the engine start logic. Then, check if the seat mounting brackets are deformed—mine were knocked askew by a mechanic during the last service. Regularly clean the mud accumulation inside the wheel hubs, which is more effective than wheel balancing. Finally, switching to quieter tires made a big difference; after I changed to Michelin tires, both tire noise and vibrations reduced significantly, making the rear seats finally comfortable enough for a peaceful sleep.

[LeJesse]

The rear vibration issues in Song Plus DM-i can be addressed in three main scenarios. For engine engagement vibrations, an ECU software upgrade is needed to optimize the starting RPM. When dealing with tire-related problems, ensure all four wheels undergo dynamic balancing—don't fall for roadside shops that only service the front wheels. Loose seat buckles can be fixed personally by lifting the seat cushion and tightening the screws with a 10mm wrench. A hidden issue lies in the trunk: improperly secured spare tires or disorganized tools may cause resonance sounds, which can be resolved by wedging foam blocks tightly. Lastly, if vibrations are pronounced on rough roads, there's an 80% chance the rear shock absorbers are leaking oil, requiring full replacement. These repairs typically cost a few hundred yuan, making them far more economical than replacing the vehicle.

[BraxtonRose]

When maintaining my Song Plus DM-i, I pay special attention to rear vibration issues. The key lesson is that tire dynamic balancing must be done every 10,000 kilometers, especially immediately after tire repairs. For engine vibration, focus on checking the engine mount rubber pads—replace them if the rubber shows aging. There's a practical trick for rear seat vibration: remove the seat and apply 3M soundproofing foam at the bracket contact points. A more thorough solution is installing vibration dampers on the chassis cross members, which are readily available at repair shops. Lastly, don't overlook vibrations during charging—poor grounding of home charging piles can cause electrical interference. Just have an electrician measure the grounding resistance. These methods have been proven effective by car club members, with costs generally not exceeding 500 RMB.

[Kathy]

Just finished dealing with the rear vibration issue on my Song Plus DM-i yesterday, sharing some practical experience. The unique problem of hybrid vehicles is that during energy recovery switching, motor torque fluctuations can cause vibrations. Besides the conventional tire dynamic balancing, the key solution is to check the battery pack mounting brackets. Some car owners have encountered cases where the deformed chassis guard plate rubs against the battery box. Another clever trick is to adjust the driving mode: turn off the intelligent battery maintenance in the settings and switch to forced battery maintenance, reducing the number of engine starts and stops, which naturally decreases vibrations. Finally, applying some grease to the seat rails can significantly reduce metal friction noise. If the vibration persists after these treatments, have the 4S shop check the half-shaft balance, which requires professional equipment for detection.