s34n

Hey all I have a 2005 Chevrolet Silverado 2500HD 6.0L truck and recently I received trouble codes P0753, P0758, and P2761. I have done some research and most point to the ignition switch, but how can you tell the switch is bad? I really hope to not have to replace the shift solenoids. Does the ignition switch supply power to Shift Solenoids A & B in the tranny? If someone can point me in the right direction, it would be much helpful.

Thanks,

Sean