Autopilot and Cruise Control Disabled by G-Forces???

[SSonnentag]

I have noticed that in both our S and X, EAP and TACC are disabled if I drive through sharp dips in the highway at a high rate of speed. These aren't ditches or anything, but areas here in the desert where the roads follow the terrain down and through normally-dry washes. To be fair, if I drive the speed limit (65 mph) I have no issues and the speed control systems stay active, however, there are a couple of washes that will suddenly disable EAP and TACC if I drive through them at 70 mph.

I'm just curious if others have run across this "feature" and if anyone has any better ideas as to what sensor triggers the disarming of EAP and TACC. My best guess is too much vertical G force, e.g. rising up out of a dip too quickly.

 

[SSonnentag]

Example Location:

You can see where oil? drips from cars on the upside of this dip. This is the same location EAP/TACC are disabled if driving a bit over 65 mph.

Photo courtesy of Google.

 

[willow_hiller]

Interesting. Does it disable going up the slope, down the slope, or both?

If it's disabling going down the slope, I can imagine it being a panic disable thinking the tires have lifted off the ground!

 

[Bill_75D]

I get TACC disabled with a warning beep in the big dips of Hwy 138 east of Palmdale, CA. I think the radar "sees" the bottom of the dip as an obstacle in front of the car and panics.

 

[SSonnentag]

It seems it's on the compression/upslope side that I get the warning bells and disabling. I'm definitely not going fast enough to catch air. LOL!

I've considered Bill's idea too, and it is a possibility.

 

[Simon21]

Never happened to me. I can't really go that fast with all the traffic these days, even in the carpool lane

 

[Dithermaster]

Only the Roadster 2.0 is supposed to go airborne, so you're freaking out the computer.

 

[dsnows]

I have the exact same problem. The car suddenly slows as I approach the bottom of a dip in the highway or higher speed secondary road. Most pronounced at 65 mph and higher. Usually slows 10-15 mph before speeding back up on the upslope. I wonder if it’s a camera misalignment issue. Started back in May, and hasn’t improved with several recent updates.

 

[ucmndd]

I regularly get this in a few areas as well, related to dips in the road. TACC disengages with a "cruise not available" message.

 

[dsnows]

I regularly get this in a few areas as well, related to dips in the road. TACC disengages with a "cruise not available" message.

I've also had that error message. Have an appointment at SC in a couple weeks to get it checked.