2018 Tacoma TRD Off-Road Pre-Collision system

Hi there,
2018 Tacoma TRD Off-Road, completely stock, no mods at all. 2300 miles and I start getting this warning of "Pre-Collision System Unavailable---Clean Sensor". The warning message on the center cluster would disappear without acknowledgement within 5 sec but the orange icon would stay on. Would happen randomly from 2 to 30 minutes into a drive. No weather issues, grille and windshield were clean, random traffic or no traffic at all, day time and night time. If I turned the truck off and back on it would clear. Took to dealer after a few days of dealing with it on every drive and the tech couldn't replicate the fault on 2 drives. He took a drive with me for about 25 minutes to explain to me how things work, the same drive he had done twice that day, he pushed every button etc etc on the drive to try to re-create the problem to no avail, then as we were pulling into the dealership lot to check out the warning came on for him and he admitted it wasn't right. Pushed more buttons, ran thru the dealer car wash etc and couldn't make it go away until he shut the ignition off and started back up. At that point he said something was wrong, bring it back in when you can, which since I didn't have a ride at the time I schedule an appt a few days later. Did that this morning and now they say after contacting Toyota tech support that everything is operating properly and I need to keep the vehicle clean and out of reflections etc etc since they can't see any codes or find anything out of spec. Any thoughts?

 

Thanks to oretaco for posting this!

 

I got same exact thing. I don't care about any pre-collision stuff. I am only annoyed because the radar cruise control then says "unavailable". Regular cruise works.
I figure I'll cry about it more seriously to the dealership a few months before warranty is up.

 

I don't know about "regular cruise", once I got the message that said the PCS was unavailable I was unable to actually use my cruise control. Btw my issue started they day after the bomb cyclone blizzard here in Colorado on 3/13/19, I was driving in some pretty serious snow/wind on the way home that day, wind speeds at the airport here were over 100mph and I was driving in that, white knuckle drive to say the least. The day after when things started warming up a bit and melting is when I first had the PCS system fault. I noticed that the radiator behind my grille was seriously coated with snow/ice prior to that drive, only reason I noticed was I was clearing snow and stuff off the windshield and headlights prior to going to work.

 

I got the "clean sensor" message. I pulled over and washed the perfectly clean radome off. "Unavailable" stayed on. Of the 2 cruise controls available, radar was then unavailable, while regular still worked. I bet there's corrosion in a plugin.

 

Luckily I had my truck in before the service campaign announcement for this issue, I think my sensor is compromised to say the least even though its gone away for now, I'd like to see Toyota replace it and not just try to epoxy the sensor and in essence seal in some moisture thats already there since the sensor is already having issues.

 

This happens to me from time to time when it rains hard. They should've put the sensor inside the cabin up in the top of the windshield like Jeep just did with the Gladiator.