Upgrade to SYNC 3.4 from 3.0 and now has no GPS lock

Try that and then do a master reset. It might not hurt to use the rwdata cleaner while you do the downgrade to 3.3.

Unfortunately didnā€™t help. Downgraded to 3.3 + did a master reset and drove around 200 miles this weekend. Still no GPS lock.

This is likely a hardware issue if you do not have the proper voltage to the antenna. You need to verify this.

I did check the voltage with a multimeter as I stated in one of the last comments. I have not checked it again once downgrading to 3.3. I can check it again if you think it has possibly changed. Iā€™ll just have to pull my dash back apart.

No voltage to the GPS antenna. What should I do next?

Find the reason.

If I knew how to ā€œfind the reasonā€ I wouldnā€™t be asking for help.

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