BYD Song Plus PHEV Reliability and Ownership Guide: What Cautious Buyers Should Know

When assessing a used BYD Song Plus PHEV, pay close attention to the hybrid system's engagement smoothness. A rough transition between electric and petrol modes can indicate wear in the e-CVT or clutch pack. Look for consistent EV range – if the claimed electric range is visibly degraded, the battery may have experienced accelerated aging. Check for any dashboard warning lights related to the battery management system or electric motor. Early 2024 models had occasional software glitches causing false alarms, so a vehicle with a recent over-the-air update history is preferable.

Routine maintenance is straightforward: annual visits for oil changes, cabin filter replacement, and hybrid system checks. The petrol engine is reliable but requires proper care due to infrequent use; ensure the engine runs occasionally to prevent seal drying. Brake pads may wear unevenly because regenerative braking reduces mechanical pad usage, so inspect rotor surfaces. High-voltage battery cooling fins must be kept clean; debris blocking airflow can shorten battery life. Expect to replace the 12V auxiliary battery more frequently than in conventional cars, typically every two to three years.

BYD's global warranty typically covers the entire vehicle for a limited period and the high-voltage battery for a longer term, but terms vary by market. In many regions, the battery warranty offers replacement if capacity drops below a certain threshold, though exact thresholds are not published uniformly. After-sales support quality is mixed outside China: some markets have well-trained dealers, while others rely on third-party service networks. Confirm local warranty applicability before purchase, as parallel imports may lack full support. Spare parts availability for body panels and interior trim can be slow in less established markets.

The rotating infotainment screen is a standout feature but can develop squeaks after prolonged use due to dust ingress. The touchscreen interface is responsive, though slow start-up times occur occasionally. Over-the-air updates have improved initial software bugs, but major infotainment updates are still dealer-installed. The ADAS suite, including lane-keeping and adaptive cruise, works adequately on highways but may disengage unexpectedly on sharp curves or in heavy rain. Physical buttons for climate control are prone to becoming sticky after exposure to sunlight in hot climates.

Inspect the charge port door for smooth operation – misalignment is a known issue. Check the underside of the battery pack for any impact damage or corrosion, as the battery is mounted low. Test the EV-only driving range on a full battery; a significant discrepancy from the original estimate suggests degradation. Verify that the petrol engine starts and idles smoothly after the battery depletes. Examine the condition of the hybrid system's high-voltage orange cables; any fraying or discoloration is a red flag. Also, listen for unusual whining from the electric motor during acceleration.