I took out my avic z1 of my H2. I'm trying to put it in my new 2008 silverado 2500hd new body style diesel. I thought I found the VSS wire, but it says that I'm going 20mph all the time. And the impulse is around 58. This has to be the wrong wire or something else is wrong. Help. Where is the VSS wire on this truck. I tried all the wires from the others threads and it didn't work.

this info if for a 2008 CHEVROLET SILVERADO C2500 2DR TRUCK WITH 6.0L ENGINE, It's the closest I could find

Speed Sense = YELLOW/BLACK (AC) AT ECM MODULE UNDER HOOD ON DRIVER FENDER - BLACK PLUG PIN #57

Another source says:

2008 Chevy Silverado

UNDER VEHICLE DRIVERS SIDE ABS MODULE, ONLY GREEN/WHITE WIRE