2005 Chevrolet Silverado 6.0 Loss of Communication

[iMpoSStoR]

Has anyone heard of or experienced Loss of communication with the pcm right at 6750 RPMs. We were dyno tunning a 2005 Silverado with a 6.0 and right at 6750 it sounds like it hits the rev limiter and dies out and as we were logging once it does that we loose communication. The owner said that the truck has always done that and that he knows a couple of other people with 2005 silverados that do the same thing.. does anyone know what can cause/solve this problem?.. definitely appreciate the help.. thanx

[Bill@HPTuners]

I've personally never heard of this.

[iMpoSStoR]

yup it is a pretty weird problem... we've never ran into it ourselves.. hopefully someone can input on it.

[Bill@HPTuners]

You could check tis http://tis2web.service.gm.com/tis2web to see if there are any updates for the vin number that might correct the issue if it is a pcm calibration issue.