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I would suspect the GEM. If you have a multi-meter you should check the following:
Verify that fuses 6, 8, 15 and 20 are all in place and are not blown.Turn the key on and verify power on both sides of the fuses. Fuse 20 is only hot when the key is in the start position.If OK, check the grounds at pins 14 and 26 of C239 and pin 9 of C242.If the power and grounds check out OK, unplug the GEM module from the back of the Central Junction Box (CJB) and check for signs of corrosion at C267 that is sandwiched in between the CJB and the GEM module. If corrosion is found, replace both components and retest.If no corrosion is found and the power and grounds test out OK, check for an open or grounded International Standards Organization (ISO) communications wire from pin 25 Light Blue/White (LB/WH) of C239 to the Data Link Connector (DLC). If OK, replace the GEM module and retest.
I just wanted to check and see if you need additional help with this. If not please don't forget to rate.