TECHNICAL SERVICE BULLETIN: SERVICE ACTION: EXTERNAL AMP REPLACEMENT FOR NOISE/NO SOUND ISSUES (SA520) - This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This Service Action (SA520), along with SA521, supersedes SA494A, which is now closed. Please follow the updated information in this bulletin. This bulletin provides the procedure to replace the external amplifier on some 2022MY EV6 (CV) vehicles produced from November 17, 2021 through January 7, 2022, that may exhibit symptoms of "noise", "no sound", "intermittent noise", and/or "intermittent no sound". Follow the procedure outlined in this publication to replace the external amplifier. If the vehicle does not exhibit the symptoms, the external amplifier still needs to be replaced if it is included in the list of affected VINs.
