What Causes an Automatic Transmission Car to Stall When Reversing?
2 Answers
The reason for an automatic transmission car stalling when reversing may be due to electrical circuit failure, excessive carbon buildup in the fuel injector and spark plugs, or circuit issues. Causes of stalling when reversing: During driving, stalling can occur due to low-voltage power failure, excessive carbon buildup in the spark plugs causing unstable ignition leading to occasional stalling, or severe engine operation conditions caused by excessive carbon buildup in components like the throttle body and fuel injector, making the car prone to stalling at low speeds. Automotive electrical circuit failure: Electrical circuit failure refers to stalling during driving due to low-voltage power failure. In such cases, you should primarily check the ignition and starter switch, as well as the fuse box. Stalling caused by a short circuit in the low-voltage circuit results in intermittent stalling. Inspect the low-voltage circuit for any component failures.
I think the main reasons for an automatic transmission car stalling while reversing are unstable idle speed or control system malfunctions. From my daily driving experience, when the engine RPM of an automatic car drops too low, this issue can occur—for example, due to clogged fuel lines or dirty fuel injectors causing idle speed to drop to its limit, making stalling more likely. Additionally, insufficient transmission fluid pressure can lead to rough gear shifts, especially when reversing requires more power; the system can't handle it and shuts down. I've also encountered cases where a faulty mass airflow sensor caused the ECU to miscalculate, resulting in unstable fuel supply. It's advisable to regularly inspect the fuel system and idle speed. If stalling happens frequently, have a repair shop run diagnostics to avoid dangerous situations like stalling on an uphill stop—this issue shouldn't be delayed.
