If you sold a fully depreciated truck (depreciated value = zero) you have a gain on the sale above the original price of $2,224. Since you sold it for more than you originally paid for it (Congratulations!), you have a gain on the sale of $276.
You also have a depreciation "recapture" of $2,224 from the depreciated value of zero because it was not worth zero when you disposed of it.
Since you did have business use in 2018, I would leave it on the schedule of listed property. If TurboTax removes it, let it go.
