Toyota Tundra Truck When Stopped on Hill and Stopped It Rolls Back

Hi all. New here and seeking your knowledge.
I wanted to test out the possible hill assist with my 2018 platinum 4x4 so I parked on a slope that was enough to roll back a bit. When doing so the truck did nothing at first but about 20 feet into the backwards roll it did a noticeable jolt and then stopped. Then it seemed like the motor shut off. No throttle response and check engine light appeared. I turned the key into the off position. Started it up and I feel like it took a bit longer than normal to start. Truck then performed normal, then I put it into gear and a left.

any ideas? Does my tundra have a shut off feature like this. I should add that no check engine light remains once I restarted it.

thank you
Danman34 New Member

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Tundras do not have hill assist. How were you letting it "roll backwards" ?
I was on maybe a 10% grade in drive at a stop. Took my foot off to see if it had a hill assist and let it roll back a bit with nothing happening. Then the shutter and then the stall.
Thanks for the read. Seems like It's "normal" ? Put me at ease a bit but still strange. I was just messing around with the truck to see what it could or couldn't do and I ended up scaring myself thinking I just messed up the truck after owning it for two days.
I don't know what years have the hill start assist but this is from the manual in my 2021. Also a thing to note is that it helps when going from reverse to drive like when putting a boat in, I'm not so sure it helps when you are on a steep hill in drive and you let off the gas, I haven't tested that yet.
Also this at the bottom.
But I don't think he was activating a start assist. I think he was already running and let it roll backwards. Truck probably shut itself off to protect itself and not tear anything up.
Yeah, that's what I thought, that he just wasn't in the right conditions for it to activate.
This happened to me as well, somewhat steep hill. I probably should have put the truck into [R] before backing up but I'm used to driving a stick shift and would naturally have the clutch pushed in.
Thank you for the responses everyone.
TundraMcGov. Your friend. Your foe. Not yo Ho.

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That is insane. I'm looking inside my 1997 T100 for the buttons to engage all those features. But...........alas, nowhere to be found. Unless I overlooked. Here. You can look with me and tell me if I missed them.
Take a look inside your 2017 Super White Tundra.