bishgeo

I had codes p0483/p0193/p0237 cleared them went down to tennessee to pick up tahoe on trl maybe 6k coming up jellico mtn heard screeching noise thought turbo was going out noise stopped came back again could hear fan running but not at a roar.Never made any more noise but p0483 code back seemed to strugle for power even with quad box on.Hottest temp on quad pod was 196 did not have air on.