I have a 97 K1500 with 237K miles and have had this code for over a year. I need to get this resolved as my inspection is overdue now. I replaced the transmission about 1.5 years ago with a Serta from the dealer so I went back there under warranty. They replaced the 2nd gear solenoid but the problem remains. They said it was probably the PCM, does this sound logical ? If so would a flash reprogram correct this? It must be electrical as the transmission works perfectly. Does anybody know what wiring harness or wires I should check? Thanks for all the great info here.