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Hello my name is***** am an ASE Master Technician and I am glad to help you with your question.
Pull the nav unit and check the connector for the gps antenna. I have seen loose connection cause this problem is in the past. This could also be a problem with the gps antenna itself. Has the vehicle been painted? If the paint is too thick on the gps it can interfere with the signal. If is has the body colored antenna on the roof, this is depending on the option on the vehicle.
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