Should an automatic transmission car be started in P or N gear?

[StJulian]

An automatic transmission car can be started in either P or N gear. The correct starting procedure and precautions for an automatic transmission car are as follows: Correct starting procedure for an automatic transmission car: Turn the ignition key to the second power position, allowing the car's computer system to begin self-checking for at least 6 seconds or more; press the foot brake and shift the gear from P to N; release the foot brake and turn the ignition key to the start position to ignite the engine; press the foot brake again and shift the gear from N to D, then release the handbrake; slowly release the foot brake to start moving; according to road conditions, smoothly press the accelerator to increase speed and drive safely. Precautions when starting: Starting in N gear can pose certain risks, especially the phenomenon of rolling, which is a problem everyone should avoid.

[BrookeFitz]

Having driven automatic transmission cars for over a decade, I can confidently say that starting in P (Park) is always the right choice. The P position has a small hook that locks the transmission, preventing any vehicle movement. While theoretically you could start the car in N (Neutral), it's risky - especially on slopes where the car might roll. A friend of mine once tried starting in Neutral out of convenience, and his car unexpectedly rolled back half a meter, nearly hitting a wall. Many modern vehicles now have safety features that prevent key removal unless in Park. Even when parking on level ground, I always engage the parking brake as an extra precaution. Always remember to firmly press the brake pedal before starting - this protects your transmission from damage.

[JulietDella]

When repairing cars, I often encounter owners asking this question. From the perspective of the transmission structure, in P (Park) mode, the internal parking pawl locks onto the gear, effectively putting a lock on the car. N (Neutral) mode is just a free-spinning state where the wheels are completely unrestricted. Manufacturers designed the gear lever to pass through R (Reverse) mode before reaching N mode, essentially guiding everyone to develop the habit of starting the car in P mode. Some older car manuals allow starting in N mode, but newer models have mostly switched to mandatory P mode starts. The initial current impact during startup is significant, and P mode provides better protection for the transmission gears.

[VonOmar]

As a driving instructor, I repeatedly emphasize that automatic transmission vehicles must be in 'P' (Park) position when starting the ignition. Every time a student forgets to shift to 'P' before turning the key and the engine fails to respond, it serves as the perfect teaching moment. Starting the engine in 'N' (Neutral) poses three risks: the vehicle may roll on slopes, sudden acceleration may occur if the accelerator is mistakenly pressed, and it can damage the transmission. I remember one heavy rain when a student tried to start the car on a slope in 'N', and the car slid straight toward the drainage ditch. Additionally, for vehicles with start-stop functionality, restarting after a brief engine shut-off must also be done in 'P' position.

[SanJuliana]

During car reviews, I specifically researched this detail. Modern automatic transmission TCUs (control units) by default only recognize the P-gear start signal. The engine control unit only powers the starter when you press the brake and shift to P-gear. Most models simply won't start in N-gear, and those that do will trigger a warning light. Once during filming, I deliberately tried starting in N-gear three times consecutively, and the transmission locked itself in 3rd gear. Manufacturers design it this way to prevent user error, as P-gear startup is the least damaging option for the vehicle.

[VonTeagan]

Actually, 99% of automatic transmission cars are factory-set to start in P (Park) gear. A friend who works at a 4S dealership mentioned they've handled complaints caused by starting in N (Neutral) gear: first, tire slippage when starting after rain, causing the car to suddenly lurch forward when in N gear; second, repeated ignition in N gear damaged the gear position sensor, costing over 3,000 yuan in repairs. N gear should only be used in special circumstances (like when being towed). Developing the habit of starting in P gear for daily use is more worry-free. Also, remember the correct sequence after parking: shift to P gear first before turning off the engine, otherwise, the key might get stuck and be unable to be removed next time.