Supersedes Technical Service Bulletin Group 01 number 13-20 dated August 2, 2013. MIL on. DTCs are stored in the engine control module. There may be slight power reduction at high RPMs. One of the vacuum actuators on intake runner bank 1 or bank 2 is defective. It is possible that the membrane on the vacuum actuator may tear. As a result, the intake manifold flaps do not function.
