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p0758 shiftg solenoid b electrical
p2761 tq converter clutch pressure control solenoid control circuit

2005 2500hd silverado. 6.0 4l80

truck didnt go into overdrive this morning. ran a code and cranked it back up, shifts fine now. i cleared the codes, but they come back instantly without driving the truck. ive done some google searches and it looks like some folks replace the ignition switch to clear these codes?
 

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if that be the case, you would also see codes for SS "A", TCC, and the pressure control manifold. also, when this happens, the trans will have 2nd gear starts and not shift.
 

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its just odd that its shifting fine now but throwing the code still. cleared it again and came right back on when i started the vehicle.

i went through the car wash on saturday. i am going to unplug every connector from the tranny, blow it out, grease it up and plug it back in. if not im going to have to dive into the pan i guess.
 
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