2009 350 6.4 was this failsafe

[ranwel]

135000mi pulling camper up long hill east of tuson,az did not have it in tow//my fault ,temp guage in middle, all dash inst blinked off, spedo went to zero,for 10 sec lost all power sounded like maby failsafe ,I slowed down ,shifted to tow drove ,ever thing came back on ,drove another 700 mi never turned on a code