Why won't my BYD Song start with one-button ignition?

[DelGrace]

There are several reasons why a BYD Song may fail to start with one-button ignition: 1. Battery depletion: Low temperatures in winter or forgetting to turn off certain electrical devices can prevent the vehicle from starting; or prolonged short-distance low-speed usage in winter may cause battery voltage to drop below rated levels, making the starter unable to operate normally. 2. Fuel flow obstruction: Lack of oil pressure in the engine fuel supply line caused by long-term dirt accumulation in fuel pipelines; extremely low temperatures can cause water and debris to mix and block fuel lines, resulting in failure to start. 3. Poor ignition system performance: In cold weather, low intake air temperature leads to poor fuel atomization in the cylinders. Combined with insufficient ignition energy, this can cause cylinder flooding - where excessive fuel accumulates in the cylinders beyond the flammable concentration limit, preventing ignition.