What Causes an Automatic Transmission Car to Suddenly Stall While Driving?

[McLorenzo]

Automatic transmission cars may suddenly stall while driving due to issues with the vehicle's battery, faults in the high-voltage circuit, or blockages in the engine's fuel supply system. Vehicle Battery Issues: When the battery reaches the end of its lifespan, its capacity and output voltage decrease, which can directly lead to abnormal starter operation, excessively low voltage, and the engine's spark plugs failing to produce sparks. In severe cases, the engine may stall and become difficult to start. Solution: Replace the battery. High-Voltage Circuit Faults: Inspect the high-voltage circuit for signs of aging, detachment, short circuits, or open circuits. Engine Fuel Supply System Blockage: Irregular fuel supply can interrupt the engine's stroke, or severe carbon buildup or erosion in the spark plugs may cause unstable ignition, making the engine difficult to start. The engine may also stall abnormally when the throttle changes. Solution: Perform regular cleaning and maintenance on the engine's oil circuits (including the fuel supply and lubrication circuits), promptly inspect and replace spark plugs, and if necessary, conduct a carbon removal treatment inside the cylinders.