TSB 21-2011

Some 2020 Mustang GT500 vehicles built on or before 28-Aug-2020 may exhibit various concerns with the active exhaust system. These may include "Drive Mode Not Available" or "Exhaust Mode Not Available" messages, and/or diagnostic trouble codes (DTCs) P26C5, P26C6, P26FE, P2BF9, P2BFB, P26C7, P2BF5, P2BF8, P2BFD, and/or P2BFA. This may be due to pinched wiring or a misaligned bracket where the exhaust actuator mounts. To correct the condition, follow the Service Procedure to make sure that the exhaust is seated correctly.