Supersedes Technical Service Bulletin Group 01 number 12-55 dated October 22, 2012. MIL on. DTCs are stored in the engine control module (ECM). Engine may have reduced power without significant loss of power or stalling. A deformed oil seal behind the potentiometer causes a linkage of the intake manifold flap adjustment to stick, which sets the DTCs. When the potentiometer is removed, the oil seal can be seen.