2004 GMC in limp mode with tranny codes on 2004 GMC Sierra 2500

I have a 2004 gmc sierra 6.0L v8, it went into limp mode ( stuck in 2nd gear ) it has 3 codes, 2 for solenoids in transmission and one for torque converter, garage phoned the tranny shop, they said all 3 codes means its electrical, most likey the ignition switch, i changed that and nothing. checked all fuses and power to tranny, every thing is good. Talked to another mechanic he said it could be any sensor not giving the correct readings to pcm, any ideas or experience with this would be greatly appreciated. I live 60 miles from the closest GM garage so haven't towed it in yet but that seems my only option at this point.

by in Austin, TX on September 21, 2011
1 answer
ANSWER by on March 15, 2015
Any solution for this? I'm having the SAME problem with my truck.