Should an automatic transmission car be started in Neutral or Park?

[SanMary]

Starting an automatic transmission car in Neutral (N) or Park (P) has the same effect, but starting in Park is safer from a safety perspective. Below is an analysis of whether to start an automatic transmission car in Neutral or Park: 1. First, the structural difference between Park (P) and Neutral (N) is only a locking gear. When the transmission is in Park, the locking gear engages the output shaft of the transmission, preventing it from rotating and enabling parking, without affecting the connection between the transmission and the engine. Whether in Park or Neutral, the load on the engine during startup remains unchanged, and the power transmission to the transmission is also the same, so the impact on the vehicle is identical. 2. Secondly, from a safety standpoint, starting in Park is safer. During startup, since various components of the vehicle, including the braking system, are not yet operational, shifting the transmission into Neutral at this time could lead to a rolling accident if the foot brake's stopping power is insufficient.

[ColemanFitz]

I've been driving for over a decade, and it's best to start an automatic transmission car in P (Park) gear. This is because the P gear has a locking mechanism that secures the transmission system, preventing the car from rolling even if the brake isn't pressed during startup—especially important when parked on a slope. Once, I was in a hurry and started the car in neutral, forgot to press the brake, and nearly hit a wall, which gave me quite a scare. Actually, many cars can start in neutral, but the car manual clearly states that starting in P gear is the standard procedure, which is also better for the transmission's lifespan. Developing the habit of checking the gear position is crucial: press the brake, confirm it's in P gear, then turn the key—the whole process takes less than two seconds but adds an extra layer of safety.

[LeAbigail]

Last week I accompanied a friend to get his car repaired. The mechanic mentioned their shop frequently receives vehicles damaged due to starting in Neutral. When starting in Park (P), the electronic system immediately disengages the power transmission chain while the parking pawl locks the gear, creating dual protection. Many people habitually start the engine by just pressing the brake pedal, but human error is inevitable - especially during rain/snow when slippery surfaces increase rollaway risks. Most modern vehicles now have safety mechanisms: the engine won't start unless in Park. If your car ever starts in Neutral (N), it likely indicates a programming fault requiring immediate service.