Why does the Audi A6 automatically shut off when shifted to P gear?

[KingFitz]

When the driver shifts into P gear, it is equivalent to informing the vehicle's computer that the car has come to a complete stop, and it can be turned off at any time. The engine can be turned off in any gear: In fact, the car can be turned off in all gears. If the engine is turned off in D gear or R gear, the car may suddenly lurch when restarted, which is quite dangerous; if the engine is turned off in N gear, the car can be moved by external force, which also poses potential risks. It is best to turn off the engine in P gear: P gear is actually similar to N gear, as both can cut off the power transmission inside the transmission. However, P gear has an additional locking mechanism compared to N gear, which locks the output shaft, preventing both wheels from rotating in the same direction.

[SanAdalynn]

I've encountered a similar issue while driving my Audi A6—the engine automatically shuts off when shifting to P gear. This is typically a normal function of the vehicle's start-stop system, designed to reduce fuel consumption and emissions when parked. Audi's system is quite intelligent; when the gear is shifted to Park, the engine automatically stops, helping you save money and be eco-friendly. However, if it frequently shuts off when it shouldn't—such as on a slope or right after a cold start—it could indicate a problem. Possible causes include a malfunctioning P-gear position sensor sending incorrect signals, insufficient battery charge triggering a protection mechanism, or even outdated engine control unit software. As a first step, check the vehicle settings menu to see if the start-stop function is enabled or disabled. If the issue persists, use an OBD tool to scan for error codes. Don’t forget routine battery maintenance to avoid low charge. This feature is very useful for city driving, though it won’t shut off if temperatures are too low or if there’s high demand for air conditioning, so occasional non-operation is normal. In short, don’t panic during normal use, but get it checked promptly if abnormal behavior occurs.

[McCaroline]

As a frequent driver of an Audi A6, the automatic engine shut-off when shifting to P mode is part of the start-stop technology and quite common. This system turns off the engine to save fuel when parked, especially noticeable when shifting to P mode in congested traffic or at red lights. If it shuts off incorrectly, such as malfunctioning while driving, troubleshooting is necessary. Potential causes include a faulty transmission control module sending incorrect commands, unstable idling triggering automatic shutdown, or interference with the vehicle's electronic systems. I recommend starting with the basics: check if the start-stop button is turned off and test whether shifting to P mode at idle follows a regular pattern. If abnormalities occur frequently, visit a professional repair shop immediately to prevent damage to the engine or transmission. Regular maintenance is crucial—cleaning gear sensors and updating software can minimize issues. While this feature benefits energy efficiency, extra attention is needed if the battery is aging.

[SanFaith]

My car is an Audi A6, and sometimes it shuts off when I shift to P gear. At first, I thought it was broken, but later I heard that this is a fuel-saving design of the car. The start-stop system automatically stops the engine in parking gear to reduce exhaust emissions. However, if this happens every time or the engine shuts off at unreasonable times, there might be a problem. Common causes include poor contact in the gear switch, leading to signal transmission errors, or battery voltage fluctuations affecting control. It is recommended to check the manual to confirm the function settings—no need to worry if everything is normal. If abnormalities occur, promptly visit a 4S shop to have a technician inspect it. Simple maintenance can prevent issues.