Despite his 2017 performance, Davidson was the crew member of the number 8 Toyota entry who was moved aside to allow Fernando Alonso to contest the 2018–19 FIA World Endurance Championship. Toyota switched Davidson backward into a test and reserve role, and he did not compete in the first two races of the 'superseason', including the 2018 24 Hours of Le Mans. He made his first race appearance in 2018 at Silverstone, driving in the LMP2 class for American team DragonSpeed, where he finished fourth in class.