C5 GPS Signal Loss

I had a similar problem on my C5. If the error message points to the GPS antenna, that could be it. Have you checked the antenna connection at the GPS module?

Where is the GPS module located in the Citroen C5? I want to inspect the connection before replacing the GPS antenna.

Mine was behind the glove compartment, but access is tricky. Since the error message points to the antenna, a workshop diagnostic check might be worth it.

I had the car inspected at a workshop. The GPS antenna was defective, and replacing it fixed the issue. Total cost was 200€.