[Bruce Nunnally]

http://www.gmtechlink.com/images/issues/jul05/TLjul05e.html

Owners of some 2005 Chevrolet Corvettes and 2004 - 05 Cadillac XLRs may experience a no-crank condition, with no codes in any module. The concern may be followed by an inoperative transmission range indicator (PRNDL). The Tech 2 will show the transmission range circuits are all reading high when any gear is selected.

Check for a loose or broken ground G402 at the right rear suspension cradle. See SI document 1495107.