im not sure if the scanner/reader is set to the ISO 9141 standard. ill check it later tonight, however i went to 2 different autozones stores and it would not work at either one of thoes locations.
the plug itself looks just like the one that is in my toyota sienna and chevy equinox, also pulled the the codes on my sisters olds 1998 minivan with no problem.
i think it should read the codes on my truck, but ill check with the scanner manual again.

thanks bill