What Causes an Automatic Transmission Car to Stall When Shifting Gears?

[DelAbigail]

Automatic transmission cars may stall when shifting gears due to battery issues, high-voltage circuit faults, or fuel line blockages in the engine. Battery Issues: When the battery reaches the end of its lifespan, its capacity and output voltage decrease. This can directly lead to abnormal starter operation, low voltage, and issues such as the engine 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 circuits for signs of aging, detachment, short circuits, or open circuits. Engine Fuel Line Blockages: Abnormal fuel supply can cause interruptions in the engine's stroke, or severe carbon buildup or erosion in the spark plugs may lead to unstable ignition, making the engine difficult to start. The engine may also stall abnormally when the throttle changes. Solution: Perform regular cleaning and maintenance of the engine's fuel lines (including fuel supply and lubrication lines), promptly inspect and replace spark plugs, and if necessary, conduct a carbon removal treatment inside the cylinders.