Ford GT Alarm System Inactive

Interesting! I had something similar with my GT (though a different year). Check the wiring harness near the rear firewall. It's a known weak spot for corrosion. Does the error specify which siren?

Thanks! Is the rear firewall easy to get to, or do I need to remove panels? And yes, the error specifies the auxiliary siren.

Okay, that's exactly what I had. Access is a pain, but doable with basic tools. Since it's the auxiliary siren and these cars are getting old, I'd just take it to a workshop. Save yourself the trouble.

Got it! Sounds like auxiliary siren wiring is a common problem. Thanks for sharing your experience; the workshop quoted 95€ for the repair. I appreciate the help!