What Causes the Engine to Stall in D Gear?
2 Answers
D gear, also known as the drive gear, engages the corresponding forward gear hydraulic circuit automatically based on throttle opening signals and vehicle speed signals when the gearshift lever is in this position. Under normal road conditions, we can drive continuously using D gear. However, when driving on mountainous roads, it's necessary to downshift at appropriate times, such as shifting to a lower gear when climbing hills. Reasons for stalling in D gear: Insufficient fuel in the vehicle's tank or a damaged fuel level sensor. Incorrect signals from engine sensors, such as the camshaft position sensor, oxygen sensor, crankshaft position sensor, intake pressure sensor, or mass airflow sensor. Poor contact due to loose fuses, excessive gaps in wiring connectors, or short circuits/open circuits in the wiring harness, which may disconnect due to road vibrations, causing the engine to stall. Poor fuel quality leading to engine misfires, or carbon buildup in the throttle body, fuel injectors, or internal engine passages. Malfunctions in the fuel system, such as a damaged fuel pump causing insufficient pressure, a clogged fuel filter, or obstructed fuel lines. Solutions: If the engine stalls in D gear, you can shift to P (Park) or simply press the brake pedal to restart the engine. Neither method will cause damage to the transmission.
Last time I was on the highway, my car suddenly stalled while in D gear, which really scared me. This situation is mostly caused by a power system warning, so it's important to check the fuel line, fuel injectors, and transmission oil pressure. When the engine loses power, the steering wheel can suddenly become heavy, and the brake assist might also weaken, so you must immediately turn on the hazard lights and pull over to restart. If the engine warning light comes on after restarting, don't force it to drive—it's likely you'll need to clean the throttle body or check the transmission valve body. I remember my neighbor's car had a similar issue last month, and it was finally resolved by replacing the crankshaft position sensor.
