Some 2020-2021 Mustang GT500 vehicles may exhibit a lack of power and/or an illuminated malfunction...

Bulletin number

SSM 50578

Component

Engine and engine cooling

Summary

Some 2020-2021 Mustang GT500 vehicles may exhibit a lack of power and/or an illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P1228. This may be due to the one-way clutch on the supercharger drive assembly. With the supercharger belt removed, a failed one-way clutch within the pulley rotates freely in both directions. The supercharger drive assembly KR3Z-6J022-B is now available as a lower level service part, separate from the supercharger assembly. Refer to the parts catalog and Workshop Manual (WSM), Section 303-12D for installation.

Owners of these vehicles have filed 37 complaints in the engine category.