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G6 OBD2 mystery

3.8K views 4 replies 3 participants last post by  DAKEN08G6GXP  
Welcome to the club and good troubleshooting.

Did you find this thread? https://www.g6ownersclub.com/thread...m/threads/2005-pontiac-g6-obd2-no-link-spliced-wire-need-help.53332/post-284168. There is a wiring diagram showing the OBD port connections running to the BCM. 12v is good. Did you try checking ground continuity to pin 4 and 5. A number of owners have found bad grounds. The other thread also mentions adding dielectric grease to the BCM connectors that may be worth a try.

Good luck with the fix.