UMMMMM, hummmm. here is the deal. The 08 Colbalt has the GM LAN data bus. its nasty. The VSS in the car is a DATA transmission. SOOOO, you can not get it or hook up to it at all. I even checked the LAN adapters and they will not convert the DATA signal for you. (that I have found) I have checked with different sources and all say "?" I know someone that has a 06 Colbalt and he got his VSS at the WHEEL SENSOR. I checked with Pioneer and the tech info says a analog VSS is not on a 08 Colbalt. SOOOOOOO, your kinda stuck. Unless someone has a way of mapping the car I cant really help you.
This is what I do know >>>>> The 08 is all GM LAN BUS and the 06 was GM class II data bus. Class II data bus was analog at the wheel (it uses magnets to count wheel rotation) to the computer then changed to data. The GM CLASS II DATA Wiring harness from METRA did convert the data to a usable analog wire which was super sweet. BUT, yours is not CLASS II but LAN and as far as I know, the LAN adapter does NOT convert this wire. SO, I can do some more looking but your only choice might to be pulling off tires to find the wheel sensor and hooking up to it. It sucks I know but YOU SHOULD BE VERY CAREFUL PUTTING A RADIO IN YOUR CAR. The LAN data is NOT FORGIVING. I believe the non bose version for you car is LAN03. All the other LAN adapters will plug in too but if it not the right one, POOF! call a tow truck and pay GM a few grand to replace control modules. Im not being mean but some one in my shop plugged a GM LAN 03 into a LAN 06 and the turned the key on. $2600.00 bill for GM to fix it.
SO, in conclusion, I say if there is a Cobalt forum somewhere I would ask around on it to see if someone has found it. other than that Its either buy a VSS kit which will add a VSS wire to any car or pull tires till you find the sensor or see if you can find a radio wiring harness that does LAN and VSS (if someone makes one). DO NOT GUESS ON ANY WIRE IN YOUR CAR. USE A WIRING HARNESS MADE EXACTLY FOR YOUR CAR AND ANY WIRE YOU THINK IS A VSS WIRE NEEDS TO BE CHECKED WITH A MULTIMETER BEFORE YOU HOOK ANYTHING UP TO IT.
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OK
I know thats a lot but thats the deal.
hit me back if you need anything else.