reset everything again added gm pid's and atz in profile now it works but I have no way to check it.

Tried adding custom pid above can not get it to work no matter what I do it reads -423.Tried adding atz also with the manually entered pid and the one...

I looked through the ford list and do not see balance rates?

Ian this maybe a stupid question but why would you update FORD if the vehicles in question are CHEVROLET? Thanks for your time

will this help?