Failure to reach designated speed

Tim_Farrell

Following the latest software update, my Model Y fails to accelerate to the designated speed while not on a highway. I must manually increase to the designated speed, regardless of whether autopilot is on. Is anybody else encountering the same issue? Am I perhaps overlooking a setting?

yellercat

Additional details would be beneficial. Does it fail to accelerate from a standstill? Are you suggesting that it no longer adheres to the established pace as it previously did?

bebbmi

I have the same problem, and it frustrates me immensely. Despite the speed restriction being 25, if I configure the vehicle to 30, it indicates my intention for it to go at that pace.

yellercat

I suspect the new adaptive Max Speed control is affecting you. It may be deactivated, but it does not fully revert to the previous behaviour.

Marvinio

I presume you own Full Self-Driving capability? Since FSD V12, the user lacks the capability to establish the maximum speed while not on limited-access highways. Despite disabling the automatic speed feature, it often fails to reach the maximum speed you have configured. During a recent drive on a straight length of road with no traffic and a speed limit of 55 mph, I set my speed to 62 mph, but the vehicle maintained a steady speed of 50 mph. It was exasperating. Modifying the FSD setting to enable speed determination was ineffective.

My answer is to create an additional driver profile with Enhanced Autopilot and Full Self-Driving disabled. This enables me to adjust the speed, and it works well.

Another concern I have encountered, which has compelled me to use the EAP profile instead of my FSD profile, is to curvilinear mountain routes where it displays inaccurate speed limits. I was on a road where the speed limit was under 30 mph, but the vehicle erroneously detected the limit as 55 mph, resulting in significant acceleration when activating FSD. One of my most terrifying situations with FSD. Another aspect of my EAP profile settings is its activation based on my current speed, rather than the potentially inaccurate speed restriction. FSD prohibits that control.

mezy

This precisely. The recent 1400-mile road journey was challenging. Upon returning to town, I have found the mechanised pace to be rather soothing.

It is somewhat below my established speed; yet, I have consistently seen exceptional efficiency with FSD in operation. On this specific segment of road where I make a left turn, the speed limit is 45 mph, but the designated speed for FSD is set at 52 mph. The FSD transitions onto the roadway and consistently does not exceed 40 mph. I am on the route for barely a minute before it veers right into another road. I contend that FSD computes the energy required to get 52 mph and concludes that accelerating to that predetermined speed is unnecessary, opting instead to maintain 40 mph as the optimal velocity to approach the subsequent bend.

That is my hypothesis, and I will adhere to it!