Pre-Collision and Cruise control are not working

just posted in another thread on codes, & code reading tools. Our readout (intermittent, so the dealer couldn't find it) on our scanner detected it, as well as what the apparent cause was ... a speed sensor. After they replaced it (under warranty) no more intermittent failures.
even so ... it could be any number of other causes.
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Check the sensors are clean (windscreen and LOGO in the grille).

 

Yeah I had the same issue just the other day. The glass in front of the camera had misted up in the cold weather. Fixed itself the glass when it was clear again. So stuff obscuring the camera can definitely cause this.

SM-T813 ?

 

Yes, I think I saw that mentioned in the manual somewhere.

I had my first occurrence of rain interfering with the CC the other day when I was driving in really hard rain. I have seen it mentioned in the handbook, but it was the first time in over 3 years actually experiencing it. It felt very odd when the car suddenly started speeding up, so I decided to turn it off until the heavy rain had passed

 

Yep - in cyclonic rain - or severe storms, it's not reliable. Only had it ½ doz times in 4½ years though. Also immediately afterwards when there is a lot of spray on a fast busy wet motorway - spooks the DRCC.