When starting out at an automatic car wash that uses a track to pull the vehicle into the car wash you need to shift the Model Y into Neutral. You may be better off selecting the Free Roll setting (same as Neutral) from within the Car Wash mode (Car Wash mode is found under the Service Settings) rather than pushing up on the shift lever half way for ~1 second. Pushing up too far on the lever will cause the Model Y to shift into Reverse. You have to be stopped, with your foot on the brake pedal to enter Free Roll.
You can also use Car Wash mode when hand washing the Tesla Model Y or using one of the stationary automatic drive-in bay car washes. Car Wash mode automatically performs multiple functions so you don't have to remember them all. Car Wash mode will unlock the doors, lock the charging port cover, turn on recirculate cabin air (this setting should help keep water from the car wash from entering the HVAC system) and close the windows. (At one time Car Wash mode would automatically close the windows, not sure if it still does.) You can optionally fold the mirrors. You must manually select the Free Roll function to activate this function.
The trickier part is when exiting an automatic car wash with a track you need apply the brake pedal briefly in the Model Y before you can shift from Free Roll (Neutral) into Drive. The Tesla Model Y's wheels may jump out of the track when the brakes are applied. If there is a vehicle behind the Model Y and the Model Y gets hung up exiting the car wash there is a chance of the following vehicle hitting the rear of the Model Y. You don't need to turn off Car Wash mode when driving away from the car wash as the Tesla Model Y will automatically exit Car Wash mode when the Model Y is being driven faster than XX miles per hour (this is a low speed, I forget the value).
Thanks for the sanity-check. This is what I assumed, I just think Tesla is a little crazy assuming the general population can handle this. I"m sure they think it's a safety issue to force the brake application between D&N. I can't think of another car brand that forces this. I did NOT know you could drive in car wash mode, so that is very helpful.
In a related idiosyncrasy, every morning when I get in the car I immediately step on the brake, put the car in drive, start creeping forward, put my phone in it's mount, close the garage door, and buckle my seatbelt as I'm pulling into my street. If I let my foot off the gas pedal and the car senses it is coasting without the driver's seatbelt fastened, it slams the car into park - full stop. I'm sure that is all safety-based, but it makes me keep my foot on the gas while multi-tasking the morning departure routine. ( I guess I better put my flame suit on)
Thought I'd drop this here, though not particularly helpful:
Car Wash Mode
When taking Model Y to a car wash, Car Wash Mode closes all windows, locks the charge port, and disables windshield wipers, Sentry Mode, walk-away door locking, and parking sensor chimes. To enable, touch Controls > Service > Car Wash Mode. Your vehicle must be stationary and not actively charging.
If using an automatic car wash, Enable Free Roll keeps your vehicle in Neutral and activates free roll for the duration of the wash, while preventing Model Y from applying the Parking brake if you leave the driver's seat. To enable, press on the brake pedal and touch Enable Free Roll; or shift into Neutral.
Car Wash Mode disables if the vehicle's speed exceeds 9 mph (15 km/h) or by touching Exit on the touchscreen.
CAUTION
Failure to put Model Y in Car Wash Mode may result in damage (for example, to the charge port or windshield wipers). Damage caused by car washes is not covered by the warranty.