Crawl control problem.

The difference between 1 and 5 is less than 2 mph. Your system is working as intended.

 

I know they nerfed the CC on the 2020 models. Perhaps this is a side effect?

 

I wasnt aiming my opinion or comment at you, just what I thought for myself.

 

Asphalt Parking lot CC test
Level 1 - speedo reads 0mph, very jerky, ABS noises from every wheel, buzzing, whirring, generally obnoxious
Level 2 - speedo reads 0, less jerky, much less noise from ABS
Level 3 - speedo reads 1, fairly smooth, occasional braking
Level 4 - speedo reads 1-2, moves smoothly, didn't notice any ABS noises
Level 5 - speedo reads 2-3, smooth, quiet, feels approximately like if you were just putting along at idle

The manual doesn't list any speeds in the CC section. It does list what driving conditions for which each level would be appropriate.

 

It’s because you have the pre 2020 off road. I believe Toyota screwed up the 2020 crawl control .