From other forums, apparently there is a STAR case for it S1323000022 . I have been unable to find a link where I can check the case details.
I had the same issue and they got a check engine light which the dealer had no idea how to fix and wouldn't b/c I am tuned. I found that the bolts holding the EGR tube on to the engine came loose and it was causing an air gap which is the humming noise almost like a bad ground. I would check that.
@MDA .. can you post a pic of the bolts that were loose. I will give it a shot.I had the same issue and they got a check engine light which the dealer had no idea how to fix and wouldn't b/c I am tuned. I found that the bolts holding the EGR tube on to the engine came loose and it was causing an air gap which is the humming noise almost like a bad ground. I would check that.