I just picked up a 2017 Colorado Z71 V6. I have the standard gears P, R, N, D, L. Can someone explain what the gear 'L' means in the automatic transmission? Low? Is 'L' also used for manual mode? It's not clear in the user manual.
Yes, it is a manual mode. If you drop from D to L while cruising, it'll drop 2 gears. If you shift up through the gears using L, it'll hold the gear you stopped at, and not go higher, but act as D for lower gears with auto downshifting.