I have a 04 duramax with a LB7. I just finished installimg a six gun w/speed loader. The led light is flashing a 2,4 code which states in the manual to check the TCC connections. The connections are good, when the code started I thought the wire taps might be the culpret, so I soldered the wires to the proper connection, I tested continuity through the entire TCC wire harness. Everything seems to be fine. I have no added power and the led is flashing the 2,4 code. any suggestions would be appreciated Thanks