I have a 2004 Chevy Silverado Z71. The Service 4WD light came on a little while ago and hasn't gone away. I've replaced the control module under the dash and the switch. Only thing I can find to do now is go somewhere to have the codes looked at. One thing I can't find is where to have them read. Any suggestions where I can go? I'm trying to keep the truck out of the shop.

Thanks

does yours have traction control? if so turn it off then drive around a few minutes shut the truck off then start back up that may fix it. did with my wifes. i think that traction control is a crappy design it'll get you stuck in your driveway.
any way. just an option.

No, it doesn't have traction control

any scanner that is capable of body codes. does it work?

There'* no code to read

If the light is on there is a code

Then where do I read it? There'* nothing on the OBD 2. Tried that already

Are you using a scanner like a tech 2 that specifically says reads gm body codes?

It'* not specifically for GM but it does read GM codes

Has to say go body or chassis codes specifically