Pagenaud ran 12 seconds behind his team-mate as both he and the Audi R8 (19) of Alex Riberas broke from braking, though it was not clear if the pair was in contact.
The rumpled nose From number 6 Acura, Pagenaud undertook to halt about five minutes earlier than the rest of the prototypes, and he dropped to third place behind the current rival of the Acuras, the # 10 Wayne Taylor Racing Cadillac DPi-VR by Renger van der Zande.
He was 45 seconds behind Castroneves and 3 seconds ahead of Pagenaud until a full course intention flew shortly after the 10th hour because the Juncos Racing Cadillac had spilled a wheel shortly after a pit stop.
That The Nissan DPi from Romain Dumas was raced by CORE autosport this year to get closer to the top three, just ahead of Pipo Derani, who just took over from Eric Curran in the # 31
In sixth place is Misha Goikhbe rg's JDC-Miller Cadillac, if only a lap, with Harry Tincknell driving the # 55 Mazda RT24-P one more lap behind.
Pastor Maldonado and Henrik Hedman continued in the LMP2 category in the LMP2 standings with 1-2 points, while Kris Wright is still five laps behind performance Tech Motorsports Oreca.
In GT Le Mans, the battle has become hot: Miguel Molina leads the class in the Risi Competizione Ferrari 488 – although he needed a pit stop just under 22 minutes ago, his next pursuer, Mathieu Jaminet, in the Porsche 911 RSR # 912 and 18 Minutes earlier than Antonio Garcia's Corvette C7.R # 3 in third place.
The # 66 Ford GT by Joey Hand is in fourth place and lies with Molina on the same pit stop strategy ahead of Corvette by Marcel Fassler, the BMW M8 of Colton Herta and the Porsche of Frederic Makowiecki.
GT Daytona sees reigning champions Bryan Sellers and Paul Miller Racing in the Lamborghini Huracan ahead of the Montaplast of Land C8 by Austin C indric's AIM Vasser Sullivan The Lexus RC F and the Grasser Racing Team Lambo by Rolf Ineichen
Scott Hargrove in the PFAFF Motorsports Porsche 911 GT3 R fifth place ahead of Ben Keating, the well-powered Mercedes AMG GT of Mercedes AMG GT and Dominik Farnbacher's Scuderia Corsa Ferrari 488th